Merge tag 'pwm/for-3.15-rc1' of...

Merge tag 'pwm/for-3.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm

Pull pwm changes from Thierry Reding:
 "The legacy HAVE_PWM Kconfig symbol is finally being retired.  Thanks a
  lot to Sascha Hauer for doing that.

  Three new drivers are added: Freescale FTM, Cirrus Logic CLPS711X and
  Intel Low Power Subsystem.

  An assortment of fixes and cleanups rounds things off for this release
  cycle"

* tag 'pwm/for-3.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm:
  pwm: pxa: Constify OF match table
  pwm: pxa: Fix typo "pwm" -> "PWM"
  Revert "pwm: pxa: Use of_match_ptr()"
  pwm: add support for Intel Low Power Subsystem PWM
  pwm: Add CLPS711X PWM support
  pwm: atmel: correct CDTY calculation
  pwm: atmel: Fix polarity handling
  Documentation: Add device tree bindings for Freescale FTM PWM.
  pwm: Add Freescale FTM PWM driver support
  pwm: pxa: Use of_match_ptr()
  pwm: samsung: Use SIMPLE_DEV_PM_OPS macro
  pwm: renesas-tpu: Add dependency on HAS_IOMEM
  pwm: Remove obsolete HAVE_PWM Kconfig symbol

Documentation/devicetree/bindings/pwm/cirrus,clps711x-pwm.txt

+* Cirris Logic CLPS711X PWM controller
+
+Required properties:
+- compatible: Shall contain "cirrus,clps711x-pwm".
+- reg: Physical base address and length of the controller's registers.
+- clocks: phandle + clock specifier pair of the PWM reference clock.
+- #pwm-cells: Should be 1. The cell specifies the index of the channel.
+
+Example:
+	pwm: pwm@80000400 {
+		compatible = "cirrus,ep7312-pwm",
+			     "cirrus,clps711x-pwm";
+		reg = <0x80000400 0x4>;
+		clocks = <&clks 8>;
+		#pwm-cells = <1>;
+	};

Documentation/devicetree/bindings/pwm/pwm-fsl-ftm.txt

+Freescale FlexTimer Module (FTM) PWM controller
+
+Required properties:
+- compatible: Should be "fsl,vf610-ftm-pwm".
+- reg: Physical base address and length of the controller's registers
+- #pwm-cells: Should be 3. See pwm.txt in this directory for a description of
+  the cells format.
+- clock-names: Should include the following module clock source entries:
+    "ftm_sys" (module clock, also can be used as counter clock),
+    "ftm_ext" (external counter clock),
+    "ftm_fix" (fixed counter clock),
+    "ftm_cnt_clk_en" (external and fixed counter clock enable/disable).
+- clocks: Must contain a phandle and clock specifier for each entry in
+  clock-names, please see clock/clock-bindings.txt for details of the property
+  values.
+- pinctrl-names: Must contain a "default" entry.
+- pinctrl-NNN: One property must exist for each entry in pinctrl-names.
+  See pinctrl/pinctrl-bindings.txt for details of the property values.
+
+
+Example:
+
+pwm0: pwm@40038000 {
+		compatible = "fsl,vf610-ftm-pwm";
+		reg = <0x40038000 0x1000>;
+		#pwm-cells = <3>;
+		clock-names = "ftm_sys", "ftm_ext",
+				"ftm_fix", "ftm_cnt_clk_en";
+		clocks = <&clks VF610_CLK_FTM0>,
+			<&clks VF610_CLK_FTM0_EXT_SEL>,
+			<&clks VF610_CLK_FTM0_FIX_SEL>,
+			<&clks VF610_CLK_FTM0_EXT_FIX_EN>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_pwm0_1>;
+};

arch/arm/Kconfig

@@ -113,9 +113,6 @@ config ARM_DMA_IOMMU_ALIGNMENT
 
 endif
 
-config HAVE_PWM
-	bool
-
 config MIGHT_HAVE_PCI
 	bool
 
@@ -633,7 +630,6 @@ config ARCH_LPC32XX
 	select CPU_ARM926T
 	select GENERIC_CLOCKEVENTS
 	select HAVE_IDE
-	select HAVE_PWM
 	select USE_OF
 	help
 	  Support for the NXP LPC32XX family of processors

arch/arm/mach-pxa/Kconfig

@@ -7,7 +7,6 @@ comment "Intel/Marvell Dev Platforms (sorted by hardware release time)"
 config MACH_PXA3XX_DT
 	bool "Support PXA3xx platforms from device tree"
 	select CPU_PXA300
-	select HAVE_PWM
 	select POWER_SUPPLY
 	select PXA3xx
 	select USE_OF
@@ -23,12 +22,10 @@ config ARCH_LUBBOCK
 
 config MACH_MAINSTONE
 	bool "Intel HCDDBBVA0 Development Platform (aka Mainstone)"
-	select HAVE_PWM
 	select PXA27x
 
 config MACH_ZYLONITE
 	bool
-	select HAVE_PWM
 	select PXA3xx
 
 config MACH_ZYLONITE300
@@ -123,7 +120,6 @@ config MACH_CM_X300
 	bool "CompuLab CM-X300 modules"
 	select CPU_PXA300
 	select CPU_PXA310
-	select HAVE_PWM
 	select PXA3xx
 
 config MACH_CAPC7117
@@ -214,7 +210,6 @@ config TRIZEPS_PCMCIA
 
 config MACH_LOGICPD_PXA270
 	bool "LogicPD PXA270 Card Engine Development Platform"
-	select HAVE_PWM
 	select PXA27x
 
 config MACH_PCM027
@@ -225,7 +220,6 @@ config MACH_PCM027
 config MACH_PCM990_BASEBOARD
 	bool "PHYTEC PCM-990 development board"
 	depends on MACH_PCM027
-	select HAVE_PWM
 
 choice
 	prompt "display on pcm990"
@@ -249,7 +243,6 @@ config MACH_COLIBRI
 config MACH_COLIBRI_PXA270_INCOME
 	bool "Income s.r.o. PXA270 SBC"
 	depends on MACH_COLIBRI
-	select HAVE_PWM
 	select PXA27x
 
 config MACH_COLIBRI300
@@ -278,7 +271,6 @@ comment "End-user Products (sorted by vendor name)"
 
 config MACH_H4700
 	bool "HP iPAQ hx4700"
-	select HAVE_PWM
 	select IWMMXT
 	select PXA27x
 
@@ -292,14 +284,12 @@ config MACH_HIMALAYA
 
 config MACH_MAGICIAN
 	bool "Enable HTC Magician Support"
-	select HAVE_PWM
 	select IWMMXT
 	select PXA27x
 
 config MACH_MIOA701
 	bool "Mitac Mio A701 Support"
 	select GPIO_SYSFS
-	select HAVE_PWM
 	select IWMMXT
 	select PXA27x
 	help
@@ -309,7 +299,6 @@ config MACH_MIOA701
 
 config PXA_EZX
 	bool "Motorola EZX Platform"
-	select HAVE_PWM
 	select IWMMXT
 	select PXA27x
 
@@ -349,7 +338,6 @@ config MACH_MP900C
 
 config ARCH_PXA_PALM
 	bool "PXA based Palm PDAs"
-	select HAVE_PWM
 
 config MACH_PALM27X
 	bool
@@ -447,7 +435,6 @@ config MACH_TREO680
 config MACH_RAUMFELD_RC
 	bool "Raumfeld Controller"
 	select CPU_PXA300
-	select HAVE_PWM
 	select POWER_SUPPLY
 	select PXA3xx
 
@@ -611,7 +598,6 @@ config MACH_E800
 
 config MACH_ZIPIT2
 	bool "Zipit Z2 Handheld"
-	select HAVE_PWM
 	select PXA27x
 endmenu
 

drivers/input/misc/Kconfig

@@ -156,7 +156,7 @@ config INPUT_MAX8925_ONKEY
 
 config INPUT_MAX8997_HAPTIC
 	tristate "MAXIM MAX8997 haptic controller support"
-	depends on PWM && HAVE_PWM && MFD_MAX8997
+	depends on PWM && MFD_MAX8997
 	select INPUT_FF_MEMLESS
 	help
 	  This option enables device driver support for the haptic controller
@@ -470,7 +470,7 @@ config INPUT_PCF8574
 
 config INPUT_PWM_BEEPER
 	tristate "PWM beeper support"
-	depends on PWM && HAVE_PWM
+	depends on PWM
 	help
 	  Say Y here to get support for PWM based beeper devices.
 

drivers/pwm/Kconfig

@@ -71,6 +71,15 @@ config PWM_BFIN
 	  To compile this driver as a module, choose M here: the module
 	  will be called pwm-bfin.
 
+config PWM_CLPS711X
+	tristate "CLPS711X PWM support"
+	depends on ARCH_CLPS711X || COMPILE_TEST
+	help
+	  Generic PWM framework driver for Cirrus Logic CLPS711X.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called pwm-clps711x.
+
 config PWM_EP93XX
 	tristate "Cirrus Logic EP93xx PWM support"
 	depends on ARCH_EP93XX
@@ -80,6 +89,16 @@ config PWM_EP93XX
 	  To compile this driver as a module, choose M here: the module
 	  will be called pwm-ep93xx.
 
+config PWM_FSL_FTM
+	tristate "Freescale FlexTimer Module (FTM) PWM support"
+	depends on OF
+	help
+	  Generic FTM PWM framework driver for Freescale VF610 and
+	  Layerscape LS-1 SoCs.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called pwm-fsl-ftm.
+
 config PWM_IMX
 	tristate "i.MX PWM support"
 	depends on ARCH_MXC
@@ -119,6 +138,16 @@ config PWM_LPC32XX
 	  To compile this driver as a module, choose M here: the module
 	  will be called pwm-lpc32xx.
 
+config PWM_LPSS
+	tristate "Intel LPSS PWM support"
+	depends on ACPI
+	help
+	  Generic PWM framework driver for Intel Low Power Subsystem PWM
+	  controller.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called pwm-lpss.
+
 config PWM_MXS
 	tristate "Freescale MXS PWM support"
 	depends on ARCH_MXS && OF
@@ -160,6 +189,7 @@ config PWM_PXA
 config PWM_RENESAS_TPU
 	tristate "Renesas TPU PWM support"
 	depends on ARCH_SHMOBILE || COMPILE_TEST
+	depends on HAS_IOMEM
 	help
 	  This driver exposes the Timer Pulse Unit (TPU) PWM controller found
 	  in Renesas chips through the PWM API.

drivers/pwm/Makefile

@@ -4,11 +4,14 @@ obj-$(CONFIG_PWM_AB8500)	+= pwm-ab8500.o
 obj-$(CONFIG_PWM_ATMEL)		+= pwm-atmel.o
 obj-$(CONFIG_PWM_ATMEL_TCB)	+= pwm-atmel-tcb.o
 obj-$(CONFIG_PWM_BFIN)		+= pwm-bfin.o
+obj-$(CONFIG_PWM_CLPS711X)	+= pwm-clps711x.o
 obj-$(CONFIG_PWM_EP93XX)	+= pwm-ep93xx.o
+obj-$(CONFIG_PWM_FSL_FTM)	+= pwm-fsl-ftm.o
 obj-$(CONFIG_PWM_IMX)		+= pwm-imx.o
 obj-$(CONFIG_PWM_JZ4740)	+= pwm-jz4740.o
 obj-$(CONFIG_PWM_LP3943)	+= pwm-lp3943.o
 obj-$(CONFIG_PWM_LPC32XX)	+= pwm-lpc32xx.o
+obj-$(CONFIG_PWM_LPSS)		+= pwm-lpss.o
 obj-$(CONFIG_PWM_MXS)		+= pwm-mxs.o
 obj-$(CONFIG_PWM_PCA9685)	+= pwm-pca9685.o
 obj-$(CONFIG_PWM_PUV3)		+= pwm-puv3.o

drivers/pwm/pwm-atmel.c

@@ -32,6 +32,7 @@
 /* Bit field in CMR */
 #define PWM_CMR_CPOL		(1 << 9)
 #define PWM_CMR_UPD_CDTY	(1 << 10)
+#define PWM_CMR_CPRE_MSK	0xF
 
 /* The following registers for PWM v1 */
 #define PWMV1_CDTY		0x04
@@ -104,6 +105,7 @@ static int atmel_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 	unsigned long clk_rate, prd, dty;
 	unsigned long long div;
 	unsigned int pres = 0;
+	u32 val;
 	int ret;
 
 	if (test_bit(PWMF_ENABLED, &pwm->flags) && (period_ns != pwm->period)) {
@@ -131,7 +133,7 @@ static int atmel_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 	prd = div;
 	div *= duty_ns;
 	do_div(div, period_ns);
-	dty = div;
+	dty = prd - div;
 
 	ret = clk_enable(atmel_pwm->clk);
 	if (ret) {
@@ -139,7 +141,10 @@ static int atmel_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 		return ret;
 	}
 
-	atmel_pwm_ch_writel(atmel_pwm, pwm->hwpwm, PWM_CMR, pres);
+	/* It is necessary to preserve CPOL, inside CMR */
+	val = atmel_pwm_ch_readl(atmel_pwm, pwm->hwpwm, PWM_CMR);
+	val = (val & ~PWM_CMR_CPRE_MSK) | (pres & PWM_CMR_CPRE_MSK);
+	atmel_pwm_ch_writel(atmel_pwm, pwm->hwpwm, PWM_CMR, val);
 	atmel_pwm->config(chip, pwm, dty, prd);
 
 	clk_disable(atmel_pwm->clk);

drivers/pwm/pwm-clps711x.c

+/*
+ * Cirrus Logic CLPS711X PWM driver
+ *
+ * Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pwm.h>
+
+struct clps711x_chip {
+	struct pwm_chip chip;
+	void __iomem *pmpcon;
+	struct clk *clk;
+	spinlock_t lock;
+};
+
+static inline struct clps711x_chip *to_clps711x_chip(struct pwm_chip *chip)
+{
+	return container_of(chip, struct clps711x_chip, chip);
+}
+
+static void clps711x_pwm_update_val(struct clps711x_chip *priv, u32 n, u32 v)
+{
+	/* PWM0 - bits 4..7, PWM1 - bits 8..11 */
+	u32 shift = (n + 1) * 4;
+	unsigned long flags;
+	u32 tmp;
+
+	spin_lock_irqsave(&priv->lock, flags);
+
+	tmp = readl(priv->pmpcon);
+	tmp &= ~(0xf << shift);
+	tmp |= v << shift;
+	writel(tmp, priv->pmpcon);
+
+	spin_unlock_irqrestore(&priv->lock, flags);
+}
+
+static unsigned int clps711x_get_duty(struct pwm_device *pwm, unsigned int v)
+{
+	/* Duty cycle 0..15 max */
+	return DIV_ROUND_CLOSEST(v * 0xf, pwm_get_period(pwm));
+}
+
+static int clps711x_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+	struct clps711x_chip *priv = to_clps711x_chip(chip);
+	unsigned int freq = clk_get_rate(priv->clk);
+
+	if (!freq)
+		return -EINVAL;
+
+	/* Store constant period value */
+	pwm_set_period(pwm, DIV_ROUND_CLOSEST(NSEC_PER_SEC, freq));
+
+	return 0;
+}
+
+static int clps711x_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
+			       int duty_ns, int period_ns)
+{
+	struct clps711x_chip *priv = to_clps711x_chip(chip);
+	unsigned int duty;
+
+	if (period_ns != pwm_get_period(pwm))
+		return -EINVAL;
+
+	duty = clps711x_get_duty(pwm, duty_ns);
+	clps711x_pwm_update_val(priv, pwm->hwpwm, duty);
+
+	return 0;
+}
+
+static int clps711x_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+	struct clps711x_chip *priv = to_clps711x_chip(chip);
+	unsigned int duty;
+
+	duty = clps711x_get_duty(pwm, pwm_get_duty_cycle(pwm));
+	clps711x_pwm_update_val(priv, pwm->hwpwm, duty);
+
+	return 0;
+}
+
+static void clps711x_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+	struct clps711x_chip *priv = to_clps711x_chip(chip);
+
+	clps711x_pwm_update_val(priv, pwm->hwpwm, 0);
+}
+
+static const struct pwm_ops clps711x_pwm_ops = {
+	.request = clps711x_pwm_request,
+	.config = clps711x_pwm_config,
+	.enable = clps711x_pwm_enable,
+	.disable = clps711x_pwm_disable,
+	.owner = THIS_MODULE,
+};
+
+static struct pwm_device *clps711x_pwm_xlate(struct pwm_chip *chip,
+					     const struct of_phandle_args *args)
+{
+	if (args->args[0] >= chip->npwm)
+		return ERR_PTR(-EINVAL);
+
+	return pwm_request_from_chip(chip, args->args[0], NULL);
+}
+
+static int clps711x_pwm_probe(struct platform_device *pdev)
+{
+	struct clps711x_chip *priv;
+	struct resource *res;
+
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	priv->pmpcon = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(priv->pmpcon))
+		return PTR_ERR(priv->pmpcon);
+
+	priv->clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(priv->clk))
+		return PTR_ERR(priv->clk);
+
+	priv->chip.ops = &clps711x_pwm_ops;
+	priv->chip.dev = &pdev->dev;
+	priv->chip.base = -1;
+	priv->chip.npwm = 2;
+	priv->chip.of_xlate = clps711x_pwm_xlate;
+	priv->chip.of_pwm_n_cells = 1;
+
+	spin_lock_init(&priv->lock);
+
+	platform_set_drvdata(pdev, priv);
+
+	return pwmchip_add(&priv->chip);
+}
+
+static int clps711x_pwm_remove(struct platform_device *pdev)
+{
+	struct clps711x_chip *priv = platform_get_drvdata(pdev);
+
+	return pwmchip_remove(&priv->chip);
+}
+
+static const struct of_device_id __maybe_unused clps711x_pwm_dt_ids[] = {
+	{ .compatible = "cirrus,clps711x-pwm", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, clps711x_pwm_dt_ids);
+
+static struct platform_driver clps711x_pwm_driver = {
+	.driver = {
+		.name = "clps711x-pwm",
+		.owner = THIS_MODULE,
+		.of_match_table = of_match_ptr(clps711x_pwm_dt_ids),
+	},
+	.probe = clps711x_pwm_probe,
+	.remove = clps711x_pwm_remove,
+};
+module_platform_driver(clps711x_pwm_driver);
+
+MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
+MODULE_DESCRIPTION("Cirrus Logic CLPS711X PWM driver");
+MODULE_LICENSE("GPL");

drivers/pwm/pwm-fsl-ftm.c

+/*
+ *  Freescale FlexTimer Module (FTM) PWM Driver
+ *
+ *  Copyright 2012-2013 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/pwm.h>
+#include <linux/slab.h>
+
+#define FTM_SC		0x00
+#define FTM_SC_CLK_MASK	0x3
+#define FTM_SC_CLK_SHIFT	3
+#define FTM_SC_CLK(c)	(((c) + 1) << FTM_SC_CLK_SHIFT)
+#define FTM_SC_PS_MASK	0x7
+#define FTM_SC_PS_SHIFT	0
+
+#define FTM_CNT		0x04
+#define FTM_MOD		0x08
+
+#define FTM_CSC_BASE	0x0C
+#define FTM_CSC_MSB	BIT(5)
+#define FTM_CSC_MSA	BIT(4)
+#define FTM_CSC_ELSB	BIT(3)
+#define FTM_CSC_ELSA	BIT(2)
+#define FTM_CSC(_channel)	(FTM_CSC_BASE + ((_channel) * 8))
+
+#define FTM_CV_BASE	0x10
+#define FTM_CV(_channel)	(FTM_CV_BASE + ((_channel) * 8))
+
+#define FTM_CNTIN	0x4C
+#define FTM_STATUS	0x50
+
+#define FTM_MODE	0x54
+#define FTM_MODE_FTMEN	BIT(0)
+#define FTM_MODE_INIT	BIT(2)
+#define FTM_MODE_PWMSYNC	BIT(3)
+
+#define FTM_SYNC	0x58
+#define FTM_OUTINIT	0x5C
+#define FTM_OUTMASK	0x60
+#define FTM_COMBINE	0x64
+#define FTM_DEADTIME	0x68
+#define FTM_EXTTRIG	0x6C
+#define FTM_POL		0x70
+#define FTM_FMS		0x74
+#define FTM_FILTER	0x78
+#define FTM_FLTCTRL	0x7C
+#define FTM_QDCTRL	0x80
+#define FTM_CONF	0x84
+#define FTM_FLTPOL	0x88
+#define FTM_SYNCONF	0x8C
+#define FTM_INVCTRL	0x90
+#define FTM_SWOCTRL	0x94
+#define FTM_PWMLOAD	0x98
+
+enum fsl_pwm_clk {
+	FSL_PWM_CLK_SYS,
+	FSL_PWM_CLK_FIX,
+	FSL_PWM_CLK_EXT,
+	FSL_PWM_CLK_CNTEN,
+	FSL_PWM_CLK_MAX
+};
+
+struct fsl_pwm_chip {
+	struct pwm_chip chip;
+
+	struct mutex lock;
+
+	unsigned int use_count;
+	unsigned int cnt_select;
+	unsigned int clk_ps;
+
+	void __iomem *base;
+
+	int period_ns;
+
+	struct clk *clk[FSL_PWM_CLK_MAX];
+};
+
+static inline struct fsl_pwm_chip *to_fsl_chip(struct pwm_chip *chip)
+{
+	return container_of(chip, struct fsl_pwm_chip, chip);
+}
+
+static int fsl_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+	struct fsl_pwm_chip *fpc = to_fsl_chip(chip);
+
+	return clk_prepare_enable(fpc->clk[FSL_PWM_CLK_SYS]);
+}
+
+static void fsl_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+	struct fsl_pwm_chip *fpc = to_fsl_chip(chip);
+
+	clk_disable_unprepare(fpc->clk[FSL_PWM_CLK_SYS]);
+}
+
+static int fsl_pwm_calculate_default_ps(struct fsl_pwm_chip *fpc,
+					enum fsl_pwm_clk index)
+{
+	unsigned long sys_rate, cnt_rate;
+	unsigned long long ratio;
+
+	sys_rate = clk_get_rate(fpc->clk[FSL_PWM_CLK_SYS]);
+	if (!sys_rate)
+		return -EINVAL;
+
+	cnt_rate = clk_get_rate(fpc->clk[fpc->cnt_select]);
+	if (!cnt_rate)
+		return -EINVAL;
+
+	switch (index) {
+	case FSL_PWM_CLK_SYS:
+		fpc->clk_ps = 1;
+		break;
+	case FSL_PWM_CLK_FIX:
+		ratio = 2 * cnt_rate - 1;
+		do_div(ratio, sys_rate);
+		fpc->clk_ps = ratio;
+		break;
+	case FSL_PWM_CLK_EXT:
+		ratio = 4 * cnt_rate - 1;
+		do_div(ratio, sys_rate);
+		fpc->clk_ps = ratio;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static unsigned long fsl_pwm_calculate_cycles(struct fsl_pwm_chip *fpc,
+					      unsigned long period_ns)
+{
+	unsigned long long c, c0;
+
+	c = clk_get_rate(fpc->clk[fpc->cnt_select]);
+	c = c * period_ns;
+	do_div(c, 1000000000UL);
+
+	do {
+		c0 = c;
+		do_div(c0, (1 << fpc->clk_ps));
+		if (c0 <= 0xFFFF)
+			return (unsigned long)c0;
+	} while (++fpc->clk_ps < 8);
+
+	return 0;
+}
+
+static unsigned long fsl_pwm_calculate_period_cycles(struct fsl_pwm_chip *fpc,
+						     unsigned long period_ns,
+						     enum fsl_pwm_clk index)
+{
+	int ret;
+
+	ret = fsl_pwm_calculate_default_ps(fpc, index);
+	if (ret) {
+		dev_err(fpc->chip.dev,
+			"failed to calculate default prescaler: %d\n",
+			ret);
+		return 0;
+	}
+
+	return fsl_pwm_calculate_cycles(fpc, period_ns);
+}
+
+static unsigned long fsl_pwm_calculate_period(struct fsl_pwm_chip *fpc,
+					      unsigned long period_ns)
+{
+	enum fsl_pwm_clk m0, m1;
+	unsigned long fix_rate, ext_rate, cycles;
+
+	cycles = fsl_pwm_calculate_period_cycles(fpc, period_ns,
+			FSL_PWM_CLK_SYS);
+	if (cycles) {
+		fpc->cnt_select = FSL_PWM_CLK_SYS;
+		return cycles;
+	}
+
+	fix_rate = clk_get_rate(fpc->clk[FSL_PWM_CLK_FIX]);
+	ext_rate = clk_get_rate(fpc->clk[FSL_PWM_CLK_EXT]);
+
+	if (fix_rate > ext_rate) {
+		m0 = FSL_PWM_CLK_FIX;
+		m1 = FSL_PWM_CLK_EXT;
+	} else {
+		m0 = FSL_PWM_CLK_EXT;
+		m1 = FSL_PWM_CLK_FIX;
+	}
+
+	cycles = fsl_pwm_calculate_period_cycles(fpc, period_ns, m0);
+	if (cycles) {
+		fpc->cnt_select = m0;
+		return cycles;
+	}
+
+	fpc->cnt_select = m1;
+
+	return fsl_pwm_calculate_period_cycles(fpc, period_ns, m1);
+}
+
+static unsigned long fsl_pwm_calculate_duty(struct fsl_pwm_chip *fpc,
+					    unsigned long period_ns,
+					    unsigned long duty_ns)
+{
+	unsigned long long val, duty;
+
+	val = readl(fpc->base + FTM_MOD);
+	duty = duty_ns * (val + 1);
+	do_div(duty, period_ns);
+
+	return (unsigned long)duty;
+}
+
+static int fsl_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
+			  int duty_ns, int period_ns)
+{
+	struct fsl_pwm_chip *fpc = to_fsl_chip(chip);
+	u32 val, period, duty;
+
+	mutex_lock(&fpc->lock);
+
+	/*
+	 * The Freescale FTM controller supports only a single period for
+	 * all PWM channels, therefore incompatible changes need to be
+	 * refused.
+	 */
+	if (fpc->period_ns && fpc->period_ns != period_ns) {
+		dev_err(fpc->chip.dev,
+			"conflicting period requested for PWM %u\n",
+			pwm->hwpwm);
+		mutex_unlock(&fpc->lock);
+		return -EBUSY;
+	}
+
+	if (!fpc->period_ns && duty_ns) {
+		period = fsl_pwm_calculate_period(fpc, period_ns);
+		if (!period) {
+			dev_err(fpc->chip.dev, "failed to calculate period\n");
+			mutex_unlock(&fpc->lock);
+			return -EINVAL;
+		}
+
+		val = readl(fpc->base + FTM_SC);
+		val &= ~(FTM_SC_PS_MASK << FTM_SC_PS_SHIFT);
+		val |= fpc->clk_ps;
+		writel(val, fpc->base + FTM_SC);
+		writel(period - 1, fpc->base + FTM_MOD);
+
+		fpc->period_ns = period_ns;
+	}
+
+	mutex_unlock(&fpc->lock);
+
+	duty = fsl_pwm_calculate_duty(fpc, period_ns, duty_ns);
+
+	writel(FTM_CSC_MSB | FTM_CSC_ELSB, fpc->base + FTM_CSC(pwm->hwpwm));
+	writel(duty, fpc->base + FTM_CV(pwm->hwpwm));
+
+	return 0;
+}
+
+static int fsl_pwm_set_polarity(struct pwm_chip *chip,
+				struct pwm_device *pwm,
+				enum pwm_polarity polarity)
+{
+	struct fsl_pwm_chip *fpc = to_fsl_chip(chip);
+	u32 val;
+
+	val = readl(fpc->base + FTM_POL);
+
+	if (polarity == PWM_POLARITY_INVERSED)
+		val |= BIT(pwm->hwpwm);
+	else
+		val &= ~BIT(pwm->hwpwm);
+
+	writel(val, fpc->base + FTM_POL);
+
+	return 0;
+}
+
+static int fsl_counter_clock_enable(struct fsl_pwm_chip *fpc)
+{
+	u32 val;
+	int ret;
+
+	if (fpc->use_count != 0)
+		return 0;
+
+	/* select counter clock source */
+	val = readl(fpc->base + FTM_SC);
+	val &= ~(FTM_SC_CLK_MASK << FTM_SC_CLK_SHIFT);
+	val |= FTM_SC_CLK(fpc->cnt_select);
+	writel(val, fpc->base + FTM_SC);
+
+	ret = clk_prepare_enable(fpc->clk[fpc->cnt_select]);
+	if (ret)
+		return ret;
+
+	ret = clk_prepare_enable(fpc->clk[FSL_PWM_CLK_CNTEN]);
+	if (ret) {
+		clk_disable_unprepare(fpc->clk[fpc->cnt_select]);
+		return ret;
+	}
+
+	fpc->use_count++;
+
+	return 0;
+}
+
+static int fsl_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+	struct fsl_pwm_chip *fpc = to_fsl_chip(chip);
+	u32 val;
+	int ret;
+
+	mutex_lock(&fpc->lock);
+	val = readl(fpc->base + FTM_OUTMASK);
+	val &= ~BIT(pwm->hwpwm);
+	writel(val, fpc->base + FTM_OUTMASK);
+
+	ret = fsl_counter_clock_enable(fpc);
+	mutex_unlock(&fpc->lock);
+
+	return ret;
+}
+
+static void fsl_counter_clock_disable(struct fsl_pwm_chip *fpc)
+{
+	u32 val;
+
+	/*
+	 * already disabled, do nothing
+	 */
+	if (fpc->use_count == 0)
+		return;
+
+	/* there are still users, so can't disable yet */
+	if (--fpc->use_count > 0)
+		return;
+
+	/* no users left, disable PWM counter clock */
+	val = readl(fpc->base + FTM_SC);
+	val &= ~(FTM_SC_CLK_MASK << FTM_SC_CLK_SHIFT);
+	writel(val, fpc->base + FTM_SC);
+
+	clk_disable_unprepare(fpc->clk[FSL_PWM_CLK_CNTEN]);
+	clk_disable_unprepare(fpc->clk[fpc->cnt_select]);
+}
+
+static void fsl_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+	struct fsl_pwm_chip *fpc = to_fsl_chip(chip);
+	u32 val;
+
+	mutex_lock(&fpc->lock);
+	val = readl(fpc->base + FTM_OUTMASK);
+	val |= BIT(pwm->hwpwm);
+	writel(val, fpc->base + FTM_OUTMASK);
+
+	fsl_counter_clock_disable(fpc);
+
+	val = readl(fpc->base + FTM_OUTMASK);
+
+	if ((val & 0xFF) == 0xFF)
+		fpc->period_ns = 0;
+
+	mutex_unlock(&fpc->lock);
+}
+
+static const struct pwm_ops fsl_pwm_ops = {
+	.request = fsl_pwm_request,
+	.free = fsl_pwm_free,
+	.config = fsl_pwm_config,
+	.set_polarity = fsl_pwm_set_polarity,
+	.enable = fsl_pwm_enable,
+	.disable = fsl_pwm_disable,
+	.owner = THIS_MODULE,
+};
+
+static int fsl_pwm_init(struct fsl_pwm_chip *fpc)
+{
+	int ret;
+
+	ret = clk_prepare_enable(fpc->clk[FSL_PWM_CLK_SYS]);
+	if (ret)
+		return ret;
+
+	writel(0x00, fpc->base + FTM_CNTIN);
+	writel(0x00, fpc->base + FTM_OUTINIT);
+	writel(0xFF, fpc->base + FTM_OUTMASK);
+
+	clk_disable_unprepare(fpc->clk[FSL_PWM_CLK_SYS]);
+
+	return 0;
+}
+
+static int fsl_pwm_probe(struct platform_device *pdev)
+{
+	struct fsl_pwm_chip *fpc;
+	struct resource *res;
+	int ret;
+
+	fpc = devm_kzalloc(&pdev->dev, sizeof(*fpc), GFP_KERNEL);
+	if (!fpc)
+		return -ENOMEM;
+
+	mutex_init(&fpc->lock);
+
+	fpc->chip.dev = &pdev->dev;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	fpc->base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(fpc->base))
+		return PTR_ERR(fpc->base);
+
+	fpc->clk[FSL_PWM_CLK_SYS] = devm_clk_get(&pdev->dev, "ftm_sys");
+	if (IS_ERR(fpc->clk[FSL_PWM_CLK_SYS])) {
+		dev_err(&pdev->dev, "failed to get \"ftm_sys\" clock\n");
+		return PTR_ERR(fpc->clk[FSL_PWM_CLK_SYS]);
+	}
+
+	fpc->clk[FSL_PWM_CLK_FIX] = devm_clk_get(fpc->chip.dev, "ftm_fix");
+	if (IS_ERR(fpc->clk[FSL_PWM_CLK_FIX]))
+		return PTR_ERR(fpc->clk[FSL_PWM_CLK_FIX]);
+
+	fpc->clk[FSL_PWM_CLK_EXT] = devm_clk_get(fpc->chip.dev, "ftm_ext");
+	if (IS_ERR(fpc->clk[FSL_PWM_CLK_EXT]))
+		return PTR_ERR(fpc->clk[FSL_PWM_CLK_EXT]);
+
+	fpc->clk[FSL_PWM_CLK_CNTEN] =
+				devm_clk_get(fpc->chip.dev, "ftm_cnt_clk_en");
+	if (IS_ERR(fpc->clk[FSL_PWM_CLK_CNTEN]))
+		return PTR_ERR(fpc->clk[FSL_PWM_CLK_CNTEN]);
+
+	fpc->chip.ops = &fsl_pwm_ops;
+	fpc->chip.of_xlate = of_pwm_xlate_with_flags;
+	fpc->chip.of_pwm_n_cells = 3;
+	fpc->chip.base = -1;
+	fpc->chip.npwm = 8;
+
+	ret = pwmchip_add(&fpc->chip);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed to add PWM chip: %d\n", ret);
+		return ret;
+	}
+
+	platform_set_drvdata(pdev, fpc);
+
+	return fsl_pwm_init(fpc);
+}
+
+static int fsl_pwm_remove(struct platform_device *pdev)
+{
+	struct fsl_pwm_chip *fpc = platform_get_drvdata(pdev);
+
+	return pwmchip_remove(&fpc->chip);
+}
+
+static const struct of_device_id fsl_pwm_dt_ids[] = {
+	{ .compatible = "fsl,vf610-ftm-pwm", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, fsl_pwm_dt_ids);
+
+static struct platform_driver fsl_pwm_driver = {
+	.driver = {
+		.name = "fsl-ftm-pwm",
+		.of_match_table = fsl_pwm_dt_ids,
+	},
+	.probe = fsl_pwm_probe,
+	.remove = fsl_pwm_remove,
+};
+module_platform_driver(fsl_pwm_driver);
+
+MODULE_DESCRIPTION("Freescale FlexTimer Module PWM Driver");
+MODULE_AUTHOR("Xiubo Li <Li.Xiubo@freescale.com>");
+MODULE_ALIAS("platform:fsl-ftm-pwm");
+MODULE_LICENSE("GPL");

drivers/pwm/pwm-lpss.c

+/*
+ * Intel Low Power Subsystem PWM controller driver
+ *
+ * Copyright (C) 2014, Intel Corporation
+ * Author: Mika Westerberg <mika.westerberg@linux.intel.com>
+ * Author: Chew Kean Ho <kean.ho.chew@intel.com>
+ * Author: Chang Rebecca Swee Fun <rebecca.swee.fun.chang@intel.com>
+ * Author: Chew Chiau Ee <chiau.ee.chew@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/acpi.h>
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pwm.h>
+#include <linux/platform_device.h>
+
+#define PWM				0x00000000
+#define PWM_ENABLE			BIT(31)
+#define PWM_SW_UPDATE			BIT(30)
+#define PWM_BASE_UNIT_SHIFT		8
+#define PWM_BASE_UNIT_MASK		0x00ffff00
+#define PWM_ON_TIME_DIV_MASK		0x000000ff
+#define PWM_DIVISION_CORRECTION		0x2
+#define PWM_LIMIT			(0x8000 + PWM_DIVISION_CORRECTION)
+#define NSECS_PER_SEC			1000000000UL
+
+struct pwm_lpss_chip {
+	struct pwm_chip chip;
+	void __iomem *regs;
+	struct clk *clk;
+};
+
+static inline struct pwm_lpss_chip *to_lpwm(struct pwm_chip *chip)
+{
+	return container_of(chip, struct pwm_lpss_chip, chip);
+}
+
+static int pwm_lpss_config(struct pwm_chip *chip, struct pwm_device *pwm,
+			   int duty_ns, int period_ns)
+{
+	struct pwm_lpss_chip *lpwm = to_lpwm(chip);
+	u8 on_time_div;
+	unsigned long c;
+	unsigned long long base_unit, freq = NSECS_PER_SEC;
+	u32 ctrl;
+
+	do_div(freq, period_ns);
+
+	/* The equation is: base_unit = ((freq / c) * 65536) + correction */
+	base_unit = freq * 65536;
+
+	c = clk_get_rate(lpwm->clk);
+	if (!c)
+		return -EINVAL;
+
+	do_div(base_unit, c);
+	base_unit += PWM_DIVISION_CORRECTION;
+	if (base_unit > PWM_LIMIT)
+		return -EINVAL;
+
+	if (duty_ns <= 0)
+		duty_ns = 1;
+	on_time_div = 255 - (255 * duty_ns / period_ns);
+
+	ctrl = readl(lpwm->regs + PWM);
+	ctrl &= ~(PWM_BASE_UNIT_MASK | PWM_ON_TIME_DIV_MASK);
+	ctrl |= (u16) base_unit << PWM_BASE_UNIT_SHIFT;
+	ctrl |= on_time_div;
+	/* request PWM to update on next cycle */
+	ctrl |= PWM_SW_UPDATE;
+	writel(ctrl, lpwm->regs + PWM);
+
+	return 0;
+}
+
+static int pwm_lpss_enable(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+	struct pwm_lpss_chip *lpwm = to_lpwm(chip);
+	u32 ctrl;
+	int ret;
+
+	ret = clk_prepare_enable(lpwm->clk);
+	if (ret)
+		return ret;
+
+	ctrl = readl(lpwm->regs + PWM);
+	writel(ctrl | PWM_ENABLE, lpwm->regs + PWM);
+
+	return 0;
+}
+
+static void pwm_lpss_disable(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+	struct pwm_lpss_chip *lpwm = to_lpwm(chip);
+	u32 ctrl;
+
+	ctrl = readl(lpwm->regs + PWM);
+	writel(ctrl & ~PWM_ENABLE, lpwm->regs + PWM);
+
+	clk_disable_unprepare(lpwm->clk);
+}
+
+static const struct pwm_ops pwm_lpss_ops = {
+	.config = pwm_lpss_config,
+	.enable = pwm_lpss_enable,
+	.disable = pwm_lpss_disable,
+	.owner = THIS_MODULE,
+};
+
+static const struct acpi_device_id pwm_lpss_acpi_match[] = {
+	{ "80860F09", 0 },
+	{ },
+};
+MODULE_DEVICE_TABLE(acpi, pwm_lpss_acpi_match);
+
+static int pwm_lpss_probe(struct platform_device *pdev)
+{
+	struct pwm_lpss_chip *lpwm;
+	struct resource *r;
+	int ret;
+
+	lpwm = devm_kzalloc(&pdev->dev, sizeof(*lpwm), GFP_KERNEL);
+	if (!lpwm)
+		return -ENOMEM;
+
+	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+	lpwm->regs = devm_ioremap_resource(&pdev->dev, r);
+	if (IS_ERR(lpwm->regs))
+		return PTR_ERR(lpwm->regs);
+
+	lpwm->clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(lpwm->clk)) {
+		dev_err(&pdev->dev, "failed to get PWM clock\n");
+		return PTR_ERR(lpwm->clk);
+	}
+
+	lpwm->chip.dev = &pdev->dev;
+	lpwm->chip.ops = &pwm_lpss_ops;
+	lpwm->chip.base = -1;
+	lpwm->chip.npwm = 1;
+
+	ret = pwmchip_add(&lpwm->chip);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to add PWM chip: %d\n", ret);
+		return ret;
+	}
+
+	platform_set_drvdata(pdev, lpwm);
+	return 0;
+}
+
+static int pwm_lpss_remove(struct platform_device *pdev)
+{
+	struct pwm_lpss_chip *lpwm = platform_get_drvdata(pdev);
+	u32 ctrl;
+
+	ctrl = readl(lpwm->regs + PWM);
+	writel(ctrl & ~PWM_ENABLE, lpwm->regs + PWM);
+
+	return pwmchip_remove(&lpwm->chip);
+}
+
+static struct platform_driver pwm_lpss_driver = {
+	.driver = {
+		.name = "pwm-lpss",
+		.acpi_match_table = pwm_lpss_acpi_match,
+	},
+	.probe = pwm_lpss_probe,
+	.remove = pwm_lpss_remove,
+};
+module_platform_driver(pwm_lpss_driver);
+
+MODULE_DESCRIPTION("PWM driver for Intel LPSS");
+MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:pwm-lpss");

drivers/pwm/pwm-pxa.c

@@ -127,12 +127,12 @@ static struct pwm_ops pxa_pwm_ops = {
 
 #ifdef CONFIG_OF
 /*
- * Device tree users must create one device instance for each pwm channel.
+ * Device tree users must create one device instance for each PWM channel.
  * Hence we dispense with the HAS_SECONDARY_PWM and "tell" the original driver
  * code that this is a single channel pxa25x-pwm.  Currently all devices are
  * supported identically.
  */
-static struct of_device_id pwm_of_match[] = {
+static const struct of_device_id pwm_of_match[] = {
 	{ .compatible = "marvell,pxa250-pwm", .data = &pwm_id_table[0]},
 	{ .compatible = "marvell,pxa270-pwm", .data = &pwm_id_table[0]},
 	{ .compatible = "marvell,pxa168-pwm", .data = &pwm_id_table[0]},

drivers/pwm/pwm-samsung.c

@@ -598,9 +598,8 @@ static int pwm_samsung_resume(struct device *dev)
 }
 #endif
 
-static const struct dev_pm_ops pwm_samsung_pm_ops = {
-	SET_SYSTEM_SLEEP_PM_OPS(pwm_samsung_suspend, pwm_samsung_resume)
-};
+static SIMPLE_DEV_PM_OPS(pwm_samsung_pm_ops, pwm_samsung_suspend,
+			 pwm_samsung_resume);
 
 static struct platform_driver pwm_samsung_driver = {
 	.driver		= {

include/linux/pwm.h

@@ -7,7 +7,7 @@
 struct pwm_device;
 struct seq_file;
 
-#if IS_ENABLED(CONFIG_PWM) || IS_ENABLED(CONFIG_HAVE_PWM)
+#if IS_ENABLED(CONFIG_PWM)
 /*
  * pwm_request - request a PWM device
  */