Merge tag 'zynq-clk-for-3.11' of git://git.xilinx.com/linux-xlnx into next/soc

From Michal Simek:
arm: Xilinx Zynq clock changes for v3.11

Change Xilinx Zynq DT clock description which reflects logical abstraction
of Zynq's clock tree.

- Refactor PLL driver
- Use new clock controller driver
- Change timer and uart drivers

* tag 'zynq-clk-for-3.11' of git://git.xilinx.com/linux-xlnx:
  clk: zynq: Remove deprecated clock code
  arm: zynq: Migrate platform to clock controller
  clk: zynq: Add clock controller driver
  clk: zynq: Factor out PLL driver
Signed-off-by: Olof Johansson <olof@lixom.net>

Documentation/devicetree/bindings/clock/zynq-7000.txt

@@ -6,50 +6,99 @@ The purpose of this document is to document their usage.
 See clock_bindings.txt for more information on the generic clock bindings.
 See Chapter 25 of Zynq TRM for more information about Zynq clocks.
 
-== PLLs ==
-
-Used to describe the ARM_PLL, DDR_PLL, and IO_PLL.
+== Clock Controller ==
+The clock controller is a logical abstraction of Zynq's clock tree. It reads
+required input clock frequencies from the devicetree and acts as clock provider
+for all clock consumers of PS clocks.
 
 Required properties:
-- #clock-cells : shall be 0 (only one clock is output from this node)
-- compatible : "xlnx,zynq-pll"
-- reg : pair of u32 values, which are the address offsets within the SLCR
-        of the relevant PLL_CTRL register and PLL_CFG register respectively
-- clocks : phandle for parent clock.  should be the phandle for ps_clk
+ - #clock-cells : Must be 1
+ - compatible : "xlnx,ps7-clkc"
+ - ps-clk-frequency : Frequency of the oscillator providing ps_clk in HZ
+		      (usually 33 MHz oscillators are used for Zynq platforms)
+ - clock-output-names : List of strings used to name the clock outputs. Shall be
+			a list of the outputs given below.
 
 Optional properties:
-- clock-output-names : name of the output clock
-
-Example:
-	armpll: armpll {
-		#clock-cells = <0>;
-		compatible = "xlnx,zynq-pll";
-		clocks = <&ps_clk>;
-		reg = <0x100 0x110>;
-		clock-output-names = "armpll";
-	};
-
-== Peripheral clocks ==
+ - clocks : as described in the clock bindings
+ - clock-names : as described in the clock bindings
 
-Describes clock node for the SDIO, SMC, SPI, QSPI, and UART clocks.
+Clock inputs:
+The following strings are optional parameters to the 'clock-names' property in
+order to provide an optional (E)MIO clock source.
+ - swdt_ext_clk
+ - gem0_emio_clk
+ - gem1_emio_clk
+ - mio_clk_XX		# with XX = 00..53
+...
 
-Required properties:
-- #clock-cells : shall be 1
-- compatible : "xlnx,zynq-periph-clock"
-- reg : a single u32 value, describing the offset within the SLCR where
-        the CLK_CTRL register is found for this peripheral
-- clocks : phandle for parent clocks.  should hold phandles for
-           the IO_PLL, ARM_PLL, and DDR_PLL in order
-- clock-output-names : names of the output clock(s).  For peripherals that have
-                       two output clocks (for example, the UART), two clocks
-                       should be listed.
+Clock outputs:
+ 0:  armpll
+ 1:  ddrpll
+ 2:  iopll
+ 3:  cpu_6or4x
+ 4:  cpu_3or2x
+ 5:  cpu_2x
+ 6:  cpu_1x
+ 7:  ddr2x
+ 8:  ddr3x
+ 9:  dci
+ 10: lqspi
+ 11: smc
+ 12: pcap
+ 13: gem0
+ 14: gem1
+ 15: fclk0
+ 16: fclk1
+ 17: fclk2
+ 18: fclk3
+ 19: can0
+ 20: can1
+ 21: sdio0
+ 22: sdio1
+ 23: uart0
+ 24: uart1
+ 25: spi0
+ 26: spi1
+ 27: dma
+ 28: usb0_aper
+ 29: usb1_aper
+ 30: gem0_aper
+ 31: gem1_aper
+ 32: sdio0_aper
+ 33: sdio1_aper
+ 34: spi0_aper
+ 35: spi1_aper
+ 36: can0_aper
+ 37: can1_aper
+ 38: i2c0_aper
+ 39: i2c1_aper
+ 40: uart0_aper
+ 41: uart1_aper
+ 42: gpio_aper
+ 43: lqspi_aper
+ 44: smc_aper
+ 45: swdt
+ 46: dbg_trc
+ 47: dbg_apb
 
 Example:
-	uart_clk: uart_clk {
+	clkc: clkc {
 		#clock-cells = <1>;
-		compatible = "xlnx,zynq-periph-clock";
-		clocks = <&iopll &armpll &ddrpll>;
-		reg = <0x154>;
-		clock-output-names = "uart0_ref_clk",
-				     "uart1_ref_clk";
+		compatible = "xlnx,ps7-clkc";
+		ps-clk-frequency = <33333333>;
+		clock-output-names = "armpll", "ddrpll", "iopll", "cpu_6or4x",
+				"cpu_3or2x", "cpu_2x", "cpu_1x", "ddr2x", "ddr3x",
+				"dci", "lqspi", "smc", "pcap", "gem0", "gem1",
+				"fclk0", "fclk1", "fclk2", "fclk3", "can0", "can1",
+				"sdio0", "sdio1", "uart0", "uart1", "spi0", "spi1",
+				"dma", "usb0_aper", "usb1_aper", "gem0_aper",
+				"gem1_aper", "sdio0_aper", "sdio1_aper",
+				"spi0_aper", "spi1_aper", "can0_aper", "can1_aper",
+				"i2c0_aper", "i2c1_aper", "uart0_aper", "uart1_aper",
+				"gpio_aper", "lqspi_aper", "smc_aper", "swdt",
+				"dbg_trc", "dbg_apb";
+		# optional props
+		clocks = <&clkc 16>, <&clk_foo>;
+		clock-names = "gem1_emio_clk", "can_mio_clk_23";
 	};

arch/arm/boot/dts/zynq-7000.dtsi

@@ -49,16 +49,18 @@ L2: cache-controller {
 
 		uart0: uart@e0000000 {
 			compatible = "xlnx,xuartps";
+			clocks = <&clkc 23>, <&clkc 40>;
+			clock-names = "ref_clk", "aper_clk";
 			reg = <0xE0000000 0x1000>;
 			interrupts = <0 27 4>;
-			clocks = <&uart_clk 0>;
 		};
 
 		uart1: uart@e0001000 {
 			compatible = "xlnx,xuartps";
+			clocks = <&clkc 24>, <&clkc 41>;
+			clock-names = "ref_clk", "aper_clk";
 			reg = <0xE0001000 0x1000>;
 			interrupts = <0 50 4>;
-			clocks = <&uart_clk 1>;
 		};
 
 		slcr: slcr@f8000000 {
@@ -69,50 +71,21 @@ clocks {
 				#address-cells = <1>;
 				#size-cells = <0>;
 
-				ps_clk: ps_clk {
-					#clock-cells = <0>;
-					compatible = "fixed-clock";
-					/* clock-frequency set in board-specific file */
-					clock-output-names = "ps_clk";
-				};
-				armpll: armpll {
-					#clock-cells = <0>;
-					compatible = "xlnx,zynq-pll";
-					clocks = <&ps_clk>;
-					reg = <0x100 0x110>;
-					clock-output-names = "armpll";
-				};
-				ddrpll: ddrpll {
-					#clock-cells = <0>;
-					compatible = "xlnx,zynq-pll";
-					clocks = <&ps_clk>;
-					reg = <0x104 0x114>;
-					clock-output-names = "ddrpll";
-				};
-				iopll: iopll {
-					#clock-cells = <0>;
-					compatible = "xlnx,zynq-pll";
-					clocks = <&ps_clk>;
-					reg = <0x108 0x118>;
-					clock-output-names = "iopll";
-				};
-				uart_clk: uart_clk {
-					#clock-cells = <1>;
-					compatible = "xlnx,zynq-periph-clock";
-					clocks = <&iopll &armpll &ddrpll>;
-					reg = <0x154>;
-					clock-output-names = "uart0_ref_clk",
-							     "uart1_ref_clk";
-				};
-				cpu_clk: cpu_clk {
+				clkc: clkc {
 					#clock-cells = <1>;
-					compatible = "xlnx,zynq-cpu-clock";
-					clocks = <&iopll &armpll &ddrpll>;
-					reg = <0x120 0x1C4>;
-					clock-output-names = "cpu_6x4x",
-							     "cpu_3x2x",
-							     "cpu_2x",
-							     "cpu_1x";
+					compatible = "xlnx,ps7-clkc";
+					ps-clk-frequency = <33333333>;
+					clock-output-names = "armpll", "ddrpll", "iopll", "cpu_6or4x",
+							"cpu_3or2x", "cpu_2x", "cpu_1x", "ddr2x", "ddr3x",
+							"dci", "lqspi", "smc", "pcap", "gem0", "gem1",
+							"fclk0", "fclk1", "fclk2", "fclk3", "can0", "can1",
+							"sdio0", "sdio1", "uart0", "uart1", "spi0", "spi1",
+							"dma", "usb0_aper", "usb1_aper", "gem0_aper",
+							"gem1_aper", "sdio0_aper", "sdio1_aper",
+							"spi0_aper", "spi1_aper", "can0_aper", "can1_aper",
+							"i2c0_aper", "i2c1_aper", "uart0_aper", "uart1_aper",
+							"gpio_aper", "lqspi_aper", "smc_aper", "swdt",
+							"dbg_trc", "dbg_apb";
 				};
 			};
 		};
@@ -121,9 +94,8 @@ ttc0: ttc0@f8001000 {
 			interrupt-parent = <&intc>;
 			interrupts = < 0 10 4 0 11 4 0 12 4 >;
 			compatible = "cdns,ttc";
+			clocks = <&clkc 6>;
 			reg = <0xF8001000 0x1000>;
-			clocks = <&cpu_clk 3>;
-			clock-names = "cpu_1x";
 			clock-ranges;
 		};
 
@@ -131,9 +103,8 @@ ttc1: ttc1@f8002000 {
 			interrupt-parent = <&intc>;
 			interrupts = < 0 37 4 0 38 4 0 39 4 >;
 			compatible = "cdns,ttc";
+			clocks = <&clkc 6>;
 			reg = <0xF8002000 0x1000>;
-			clocks = <&cpu_clk 3>;
-			clock-names = "cpu_1x";
 			clock-ranges;
 		};
 		scutimer: scutimer@f8f00600 {
@@ -141,7 +112,7 @@ scutimer: scutimer@f8f00600 {
 			interrupts = < 1 13 0x301 >;
 			compatible = "arm,cortex-a9-twd-timer";
 			reg = < 0xf8f00600 0x20 >;
-			clocks = <&cpu_clk 1>;
+			clocks = <&clkc 4>;
 		} ;
 	};
 };

arch/arm/boot/dts/zynq-zc702.dts

@@ -28,7 +28,3 @@ chosen {
 	};
 
 };
-
-&ps_clk {
-	clock-frequency = <33333330>;
-};

arch/arm/mach-zynq/slcr.c

@@ -117,7 +117,7 @@ int __init zynq_slcr_init(void)
 
 	pr_info("%s mapped to %p\n", np->name, zynq_slcr_base);
 
-	xilinx_zynq_clocks_init(zynq_slcr_base);
+	zynq_clock_init(zynq_slcr_base);
 
 	of_node_put(np);
 

drivers/clk/Makefile

@@ -27,7 +27,7 @@ obj-$(CONFIG_MACH_LOONGSON1)	+= clk-ls1x.o
 obj-$(CONFIG_ARCH_SUNXI)	+= sunxi/
 obj-$(CONFIG_ARCH_U8500)	+= ux500/
 obj-$(CONFIG_ARCH_VT8500)	+= clk-vt8500.o
-obj-$(CONFIG_ARCH_ZYNQ)		+= clk-zynq.o
+obj-$(CONFIG_ARCH_ZYNQ)		+= zynq/
 obj-$(CONFIG_ARCH_TEGRA)	+= tegra/
 obj-$(CONFIG_PLAT_SAMSUNG)	+= samsung/
 

drivers/clk/clk-zynq.c

-/*
- * Copyright (c) 2012 National Instruments
- *
- * Josh Cartwright <josh.cartwright@ni.com>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-#include <linux/io.h>
-#include <linux/of.h>
-#include <linux/slab.h>
-#include <linux/kernel.h>
-#include <linux/clk-provider.h>
-#include <linux/clk/zynq.h>
-
-static void __iomem *slcr_base;
-
-struct zynq_pll_clk {
-	struct clk_hw	hw;
-	void __iomem	*pll_ctrl;
-	void __iomem	*pll_cfg;
-};
-
-#define to_zynq_pll_clk(hw)	container_of(hw, struct zynq_pll_clk, hw)
-
-#define CTRL_PLL_FDIV(x)	((x) >> 12)
-
-static unsigned long zynq_pll_recalc_rate(struct clk_hw *hw,
-					  unsigned long parent_rate)
-{
-	struct zynq_pll_clk *pll = to_zynq_pll_clk(hw);
-	return parent_rate * CTRL_PLL_FDIV(ioread32(pll->pll_ctrl));
-}
-
-static const struct clk_ops zynq_pll_clk_ops = {
-	.recalc_rate	= zynq_pll_recalc_rate,
-};
-
-static void __init zynq_pll_clk_setup(struct device_node *np)
-{
-	struct clk_init_data init;
-	struct zynq_pll_clk *pll;
-	const char *parent_name;
-	struct clk *clk;
-	u32 regs[2];
-	int ret;
-
-	ret = of_property_read_u32_array(np, "reg", regs, ARRAY_SIZE(regs));
-	if (WARN_ON(ret))
-		return;
-
-	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
-	if (WARN_ON(!pll))
-		return;
-
-	pll->pll_ctrl = slcr_base + regs[0];
-	pll->pll_cfg  = slcr_base + regs[1];
-
-	of_property_read_string(np, "clock-output-names", &init.name);
-
-	init.ops = &zynq_pll_clk_ops;
-	parent_name = of_clk_get_parent_name(np, 0);
-	init.parent_names = &parent_name;
-	init.num_parents = 1;
-
-	pll->hw.init = &init;
-
-	clk = clk_register(NULL, &pll->hw);
-	if (WARN_ON(IS_ERR(clk)))
-		return;
-
-	ret = of_clk_add_provider(np, of_clk_src_simple_get, clk);
-	if (WARN_ON(ret))
-		return;
-}
-CLK_OF_DECLARE(zynq_pll, "xlnx,zynq-pll", zynq_pll_clk_setup);
-
-struct zynq_periph_clk {
-	struct clk_hw		hw;
-	struct clk_onecell_data	onecell_data;
-	struct clk		*gates[2];
-	void __iomem		*clk_ctrl;
-	spinlock_t		clkact_lock;
-};
-
-#define to_zynq_periph_clk(hw)	container_of(hw, struct zynq_periph_clk, hw)
-
-static const u8 periph_clk_parent_map[] = {
-	0, 0, 1, 2
-};
-#define PERIPH_CLK_CTRL_SRC(x)	(periph_clk_parent_map[((x) & 0x30) >> 4])
-#define PERIPH_CLK_CTRL_DIV(x)	(((x) & 0x3F00) >> 8)
-
-static unsigned long zynq_periph_recalc_rate(struct clk_hw *hw,
-					     unsigned long parent_rate)
-{
-	struct zynq_periph_clk *periph = to_zynq_periph_clk(hw);
-	return parent_rate / PERIPH_CLK_CTRL_DIV(ioread32(periph->clk_ctrl));
-}
-
-static u8 zynq_periph_get_parent(struct clk_hw *hw)
-{
-	struct zynq_periph_clk *periph = to_zynq_periph_clk(hw);
-	return PERIPH_CLK_CTRL_SRC(ioread32(periph->clk_ctrl));
-}
-
-static const struct clk_ops zynq_periph_clk_ops = {
-	.recalc_rate	= zynq_periph_recalc_rate,
-	.get_parent	= zynq_periph_get_parent,
-};
-
-static void __init zynq_periph_clk_setup(struct device_node *np)
-{
-	struct zynq_periph_clk *periph;
-	const char *parent_names[3];
-	struct clk_init_data init;
-	int clk_num = 0, err;
-	const char *name;
-	struct clk *clk;
-	u32 reg;
-	int i;
-
-	err = of_property_read_u32(np, "reg", &reg);
-	if (WARN_ON(err))
-		return;
-
-	periph = kzalloc(sizeof(*periph), GFP_KERNEL);
-	if (WARN_ON(!periph))
-		return;
-
-	periph->clk_ctrl = slcr_base + reg;
-	spin_lock_init(&periph->clkact_lock);
-
-	init.name = np->name;
-	init.ops = &zynq_periph_clk_ops;
-	for (i = 0; i < ARRAY_SIZE(parent_names); i++)
-		parent_names[i] = of_clk_get_parent_name(np, i);
-	init.parent_names = parent_names;
-	init.num_parents = ARRAY_SIZE(parent_names);
-
-	periph->hw.init = &init;
-
-	clk = clk_register(NULL, &periph->hw);
-	if (WARN_ON(IS_ERR(clk)))
-		return;
-
-	err = of_clk_add_provider(np, of_clk_src_simple_get, clk);
-	if (WARN_ON(err))
-		return;
-
-	err = of_property_read_string_index(np, "clock-output-names", 0,
-					    &name);
-	if (WARN_ON(err))
-		return;
-
-	periph->gates[0] = clk_register_gate(NULL, name, np->name, 0,
-					     periph->clk_ctrl, 0, 0,
-					     &periph->clkact_lock);
-	if (WARN_ON(IS_ERR(periph->gates[0])))
-		return;
-	clk_num++;
-
-	/* some periph clks have 2 downstream gates */
-	err = of_property_read_string_index(np, "clock-output-names", 1,
-					    &name);
-	if (err != -ENODATA) {
-		periph->gates[1] = clk_register_gate(NULL, name, np->name, 0,
-						     periph->clk_ctrl, 1, 0,
-						     &periph->clkact_lock);
-		if (WARN_ON(IS_ERR(periph->gates[1])))
-			return;
-		clk_num++;
-	}
-
-	periph->onecell_data.clks = periph->gates;
-	periph->onecell_data.clk_num = clk_num;
-
-	err = of_clk_add_provider(np, of_clk_src_onecell_get,
-				  &periph->onecell_data);
-	if (WARN_ON(err))
-		return;
-}
-CLK_OF_DECLARE(zynq_periph, "xlnx,zynq-periph-clock", zynq_periph_clk_setup);
-
-/* CPU Clock domain is modelled as a mux with 4 children subclks, whose
- * derivative rates depend on CLK_621_TRUE
- */
-
-struct zynq_cpu_clk {
-	struct clk_hw		hw;
-	struct clk_onecell_data	onecell_data;
-	struct clk		*subclks[4];
-	void __iomem		*clk_ctrl;
-	spinlock_t		clkact_lock;
-};
-
-#define to_zynq_cpu_clk(hw)	container_of(hw, struct zynq_cpu_clk, hw)
-
-static const u8 zynq_cpu_clk_parent_map[] = {
-	1, 1, 2, 0
-};
-#define CPU_CLK_SRCSEL(x)	(zynq_cpu_clk_parent_map[(((x) & 0x30) >> 4)])
-#define CPU_CLK_CTRL_DIV(x)	(((x) & 0x3F00) >> 8)
-
-static u8 zynq_cpu_clk_get_parent(struct clk_hw *hw)
-{
-	struct zynq_cpu_clk *cpuclk = to_zynq_cpu_clk(hw);
-	return CPU_CLK_SRCSEL(ioread32(cpuclk->clk_ctrl));
-}
-
-static unsigned long zynq_cpu_clk_recalc_rate(struct clk_hw *hw,
-					      unsigned long parent_rate)
-{
-	struct zynq_cpu_clk *cpuclk = to_zynq_cpu_clk(hw);
-	return parent_rate / CPU_CLK_CTRL_DIV(ioread32(cpuclk->clk_ctrl));
-}
-
-static const struct clk_ops zynq_cpu_clk_ops = {
-	.get_parent	= zynq_cpu_clk_get_parent,
-	.recalc_rate	= zynq_cpu_clk_recalc_rate,
-};
-
-struct zynq_cpu_subclk {
-	struct clk_hw	hw;
-	void __iomem	*clk_621;
-	enum {
-		CPU_SUBCLK_6X4X,
-		CPU_SUBCLK_3X2X,
-		CPU_SUBCLK_2X,
-		CPU_SUBCLK_1X,
-	} which;
-};
-
-#define CLK_621_TRUE(x)	((x) & 1)
-
-#define to_zynq_cpu_subclk(hw)	container_of(hw, struct zynq_cpu_subclk, hw);
-
-static unsigned long zynq_cpu_subclk_recalc_rate(struct clk_hw *hw,
-						 unsigned long parent_rate)
-{
-	unsigned long uninitialized_var(rate);
-	struct zynq_cpu_subclk *subclk;
-	bool is_621;
-
-	subclk = to_zynq_cpu_subclk(hw)
-	is_621 = CLK_621_TRUE(ioread32(subclk->clk_621));
-
-	switch (subclk->which) {
-	case CPU_SUBCLK_6X4X:
-		rate = parent_rate;
-		break;
-	case CPU_SUBCLK_3X2X:
-		rate = parent_rate / 2;
-		break;
-	case CPU_SUBCLK_2X:
-		rate = parent_rate / (is_621 ? 3 : 2);
-		break;
-	case CPU_SUBCLK_1X:
-		rate = parent_rate / (is_621 ? 6 : 4);
-		break;
-	};
-
-	return rate;
-}
-
-static const struct clk_ops zynq_cpu_subclk_ops = {
-	.recalc_rate	= zynq_cpu_subclk_recalc_rate,
-};
-
-static struct clk *zynq_cpu_subclk_setup(struct device_node *np, u8 which,
-					 void __iomem *clk_621)
-{
-	struct zynq_cpu_subclk *subclk;
-	struct clk_init_data init;
-	struct clk *clk;
-	int err;
-
-	err = of_property_read_string_index(np, "clock-output-names",
-					    which, &init.name);
-	if (WARN_ON(err))
-		goto err_read_output_name;
-
-	subclk = kzalloc(sizeof(*subclk), GFP_KERNEL);
-	if (!subclk)
-		goto err_subclk_alloc;
-
-	subclk->clk_621 = clk_621;
-	subclk->which = which;
-
-	init.ops = &zynq_cpu_subclk_ops;
-	init.parent_names = &np->name;
-	init.num_parents = 1;
-
-	subclk->hw.init = &init;
-
-	clk = clk_register(NULL, &subclk->hw);
-	if (WARN_ON(IS_ERR(clk)))
-		goto err_clk_register;
-
-	return clk;
-
-err_clk_register:
-	kfree(subclk);
-err_subclk_alloc:
-err_read_output_name:
-	return ERR_PTR(-EINVAL);
-}
-
-static void __init zynq_cpu_clk_setup(struct device_node *np)
-{
-	struct zynq_cpu_clk *cpuclk;
-	const char *parent_names[3];
-	struct clk_init_data init;
-	void __iomem *clk_621;
-	struct clk *clk;
-	u32 reg[2];
-	int err;
-	int i;
-
-	err = of_property_read_u32_array(np, "reg", reg, ARRAY_SIZE(reg));
-	if (WARN_ON(err))
-		return;
-
-	cpuclk = kzalloc(sizeof(*cpuclk), GFP_KERNEL);
-	if (WARN_ON(!cpuclk))
-		return;
-
-	cpuclk->clk_ctrl = slcr_base + reg[0];
-	clk_621 = slcr_base + reg[1];
-	spin_lock_init(&cpuclk->clkact_lock);
-
-	init.name = np->name;
-	init.ops = &zynq_cpu_clk_ops;
-	for (i = 0; i < ARRAY_SIZE(parent_names); i++)
-		parent_names[i] = of_clk_get_parent_name(np, i);
-	init.parent_names = parent_names;
-	init.num_parents = ARRAY_SIZE(parent_names);
-
-	cpuclk->hw.init = &init;
-
-	clk = clk_register(NULL, &cpuclk->hw);
-	if (WARN_ON(IS_ERR(clk)))
-		return;
-
-	err = of_clk_add_provider(np, of_clk_src_simple_get, clk);
-	if (WARN_ON(err))
-		return;
-
-	for (i = 0; i < 4; i++) {
-		cpuclk->subclks[i] = zynq_cpu_subclk_setup(np, i, clk_621);
-		if (WARN_ON(IS_ERR(cpuclk->subclks[i])))
-			return;
-	}
-
-	cpuclk->onecell_data.clks = cpuclk->subclks;
-	cpuclk->onecell_data.clk_num = i;
-
-	err = of_clk_add_provider(np, of_clk_src_onecell_get,
-				  &cpuclk->onecell_data);
-	if (WARN_ON(err))
-		return;
-}
-CLK_OF_DECLARE(zynq_cpu, "xlnx,zynq-cpu-clock", zynq_cpu_clk_setup);
-
-void __init xilinx_zynq_clocks_init(void __iomem *slcr)
-{
-	slcr_base = slcr;
-	of_clk_init(NULL);
-}

drivers/clk/zynq/Makefile

+# Zynq clock specific Makefile
+
+obj-$(CONFIG_ARCH_ZYNQ)	+= clkc.o pll.o

drivers/clk/zynq/pll.c

+/*
+ * Zynq PLL driver
+ *
+ *  Copyright (C) 2013 Xilinx
+ *
+ *  Sören Brinkmann <soren.brinkmann@xilinx.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License v2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+#include <linux/clk/zynq.h>
+#include <linux/clk-provider.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+
+/**
+ * struct zynq_pll
+ * @hw:		Handle between common and hardware-specific interfaces
+ * @pll_ctrl:	PLL control register
+ * @pll_status:	PLL status register
+ * @lock:	Register lock
+ * @lockbit:	Indicates the associated PLL_LOCKED bit in the PLL status
+ *		register.
+ */
+struct zynq_pll {
+	struct clk_hw	hw;
+	void __iomem	*pll_ctrl;
+	void __iomem	*pll_status;
+	spinlock_t	*lock;
+	u8		lockbit;
+};
+#define to_zynq_pll(_hw)	container_of(_hw, struct zynq_pll, hw)
+
+/* Register bitfield defines */
+#define PLLCTRL_FBDIV_MASK	0x7f000
+#define PLLCTRL_FBDIV_SHIFT	12
+#define PLLCTRL_BPQUAL_MASK	(1 << 3)
+#define PLLCTRL_PWRDWN_MASK	2
+#define PLLCTRL_PWRDWN_SHIFT	1
+#define PLLCTRL_RESET_MASK	1
+#define PLLCTRL_RESET_SHIFT	0
+
+/**
+ * zynq_pll_round_rate() - Round a clock frequency
+ * @hw:		Handle between common and hardware-specific interfaces
+ * @rate:	Desired clock frequency
+ * @prate:	Clock frequency of parent clock
+ * Returns frequency closest to @rate the hardware can generate.
+ */
+static long zynq_pll_round_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long *prate)
+{
+	u32 fbdiv;
+
+	fbdiv = DIV_ROUND_CLOSEST(rate, *prate);
+	if (fbdiv < 13)
+		fbdiv = 13;
+	else if (fbdiv > 66)
+		fbdiv = 66;
+
+	return *prate * fbdiv;
+}
+
+/**
+ * zynq_pll_recalc_rate() - Recalculate clock frequency
+ * @hw:			Handle between common and hardware-specific interfaces
+ * @parent_rate:	Clock frequency of parent clock
+ * Returns current clock frequency.
+ */
+static unsigned long zynq_pll_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct zynq_pll *clk = to_zynq_pll(hw);
+	u32 fbdiv;
+
+	/*
+	 * makes probably sense to redundantly save fbdiv in the struct
+	 * zynq_pll to save the IO access.
+	 */
+	fbdiv = (readl(clk->pll_ctrl) & PLLCTRL_FBDIV_MASK) >>
+			PLLCTRL_FBDIV_SHIFT;
+
+	return parent_rate * fbdiv;
+}
+
+/**
+ * zynq_pll_is_enabled - Check if a clock is enabled
+ * @hw:		Handle between common and hardware-specific interfaces
+ * Returns 1 if the clock is enabled, 0 otherwise.
+ *
+ * Not sure this is a good idea, but since disabled means bypassed for
+ * this clock implementation we say we are always enabled.
+ */
+static int zynq_pll_is_enabled(struct clk_hw *hw)
+{
+	unsigned long flags = 0;
+	u32 reg;
+	struct zynq_pll *clk = to_zynq_pll(hw);
+
+	spin_lock_irqsave(clk->lock, flags);
+
+	reg = readl(clk->pll_ctrl);
+
+	spin_unlock_irqrestore(clk->lock, flags);
+
+	return !(reg & (PLLCTRL_RESET_MASK | PLLCTRL_PWRDWN_MASK));
+}
+
+/**
+ * zynq_pll_enable - Enable clock
+ * @hw:		Handle between common and hardware-specific interfaces
+ * Returns 0 on success
+ */
+static int zynq_pll_enable(struct clk_hw *hw)
+{
+	unsigned long flags = 0;
+	u32 reg;
+	struct zynq_pll *clk = to_zynq_pll(hw);
+
+	if (zynq_pll_is_enabled(hw))
+		return 0;
+
+	pr_info("PLL: enable\n");
+
+	/* Power up PLL and wait for lock */
+	spin_lock_irqsave(clk->lock, flags);
+
+	reg = readl(clk->pll_ctrl);
+	reg &= ~(PLLCTRL_RESET_MASK | PLLCTRL_PWRDWN_MASK);
+	writel(reg, clk->pll_ctrl);
+	while (!(readl(clk->pll_status) & (1 << clk->lockbit)))
+		;
+
+	spin_unlock_irqrestore(clk->lock, flags);
+
+	return 0;
+}
+
+/**
+ * zynq_pll_disable - Disable clock
+ * @hw:		Handle between common and hardware-specific interfaces
+ * Returns 0 on success
+ */
+static void zynq_pll_disable(struct clk_hw *hw)
+{
+	unsigned long flags = 0;
+	u32 reg;
+	struct zynq_pll *clk = to_zynq_pll(hw);
+
+	if (!zynq_pll_is_enabled(hw))
+		return;
+
+	pr_info("PLL: shutdown\n");
+
+	/* shut down PLL */
+	spin_lock_irqsave(clk->lock, flags);
+
+	reg = readl(clk->pll_ctrl);
+	reg |= PLLCTRL_RESET_MASK | PLLCTRL_PWRDWN_MASK;
+	writel(reg, clk->pll_ctrl);
+
+	spin_unlock_irqrestore(clk->lock, flags);
+}
+
+static const struct clk_ops zynq_pll_ops = {
+	.enable = zynq_pll_enable,
+	.disable = zynq_pll_disable,
+	.is_enabled = zynq_pll_is_enabled,
+	.round_rate = zynq_pll_round_rate,
+	.recalc_rate = zynq_pll_recalc_rate
+};
+
+/**
+ * clk_register_zynq_pll() - Register PLL with the clock framework
+ * @np	Pointer to the DT device node
+ */
+struct clk *clk_register_zynq_pll(const char *name, const char *parent,
+		void __iomem *pll_ctrl, void __iomem *pll_status, u8 lock_index,
+		spinlock_t *lock)
+{
+	struct zynq_pll *pll;
+	struct clk *clk;
+	u32 reg;
+	const char *parent_arr[1] = {parent};
+	unsigned long flags = 0;
+	struct clk_init_data initd = {
+		.name = name,
+		.parent_names = parent_arr,
+		.ops = &zynq_pll_ops,
+		.num_parents = 1,
+		.flags = 0
+	};
+
+	pll = kmalloc(sizeof(*pll), GFP_KERNEL);
+	if (!pll) {
+		pr_err("%s: Could not allocate Zynq PLL clk.\n", __func__);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	/* Populate the struct */
+	pll->hw.init = &initd;
+	pll->pll_ctrl = pll_ctrl;
+	pll->pll_status = pll_status;
+	pll->lockbit = lock_index;
+	pll->lock = lock;
+
+	spin_lock_irqsave(pll->lock, flags);
+
+	reg = readl(pll->pll_ctrl);
+	reg &= ~PLLCTRL_BPQUAL_MASK;
+	writel(reg, pll->pll_ctrl);
+
+	spin_unlock_irqrestore(pll->lock, flags);
+
+	clk = clk_register(NULL, &pll->hw);
+	if (WARN_ON(IS_ERR(clk)))
+		goto free_pll;
+
+	return clk;
+
+free_pll:
+	kfree(pll);
+
+	return clk;
+}

drivers/clocksource/cadence_ttc_timer.c

@@ -51,6 +51,8 @@
 
 #define TTC_CNT_CNTRL_DISABLE_MASK	0x1
 
+#define TTC_CLK_CNTRL_CSRC_MASK		(1 << 5)	/* clock source */
+
 /*
  * Setup the timers to use pre-scaling, using a fixed value for now that will
  * work across most input frequency, but it may need to be more dynamic
@@ -396,8 +398,9 @@ static void __init ttc_timer_init(struct device_node *timer)
 {
 	unsigned int irq;
 	void __iomem *timer_baseaddr;
-	struct clk *clk;
+	struct clk *clk_cs, *clk_ce;
 	static int initialized;
+	int clksel;
 
 	if (initialized)
 		return;
@@ -421,14 +424,24 @@ static void __init ttc_timer_init(struct device_node *timer)
 		BUG();
 	}
 
-	clk = of_clk_get_by_name(timer, "cpu_1x");
-	if (IS_ERR(clk)) {
+	clksel = __raw_readl(timer_baseaddr + TTC_CLK_CNTRL_OFFSET);
+	clksel = !!(clksel & TTC_CLK_CNTRL_CSRC_MASK);
+	clk_cs = of_clk_get(timer, clksel);
+	if (IS_ERR(clk_cs)) {
+		pr_err("ERROR: timer input clock not found\n");
+		BUG();
+	}
+
+	clksel = __raw_readl(timer_baseaddr + 4 + TTC_CLK_CNTRL_OFFSET);
+	clksel = !!(clksel & TTC_CLK_CNTRL_CSRC_MASK);
+	clk_ce = of_clk_get(timer, clksel);
+	if (IS_ERR(clk_ce)) {
 		pr_err("ERROR: timer input clock not found\n");
 		BUG();
 	}
 
-	ttc_setup_clocksource(clk, timer_baseaddr);
-	ttc_setup_clockevent(clk, timer_baseaddr + 4, irq);
+	ttc_setup_clocksource(clk_cs, timer_baseaddr);
+	ttc_setup_clockevent(clk_ce, timer_baseaddr + 4, irq);
 
 	pr_info("%s #0 at %p, irq=%d\n", timer->name, timer_baseaddr, irq);
 }

drivers/tty/serial/xilinx_uartps.c

@@ -14,6 +14,7 @@
 #include <linux/platform_device.h>
 #include <linux/serial.h>
 #include <linux/serial_core.h>
+#include <linux/slab.h>
 #include <linux/tty.h>
 #include <linux/tty_flip.h>
 #include <linux/console.h>
@@ -138,6 +139,16 @@
 #define XUARTPS_SR_TXFULL	0x00000010 /* TX FIFO full */
 #define XUARTPS_SR_RXTRIG	0x00000001 /* Rx Trigger */
 
+/**
+ * struct xuartps - device data
+ * @refclk	Reference clock
+ * @aperclk	APB clock
+ */
+struct xuartps {
+	struct clk		*refclk;
+	struct clk		*aperclk;
+};
+
 /**
  * xuartps_isr - Interrupt handler
  * @irq: Irq number
@@ -936,34 +947,55 @@ static int xuartps_probe(struct platform_device *pdev)
 	int rc;
 	struct uart_port *port;
 	struct resource *res, *res2;
-	struct clk *clk;
+	struct xuartps *xuartps_data;
 
-	clk = of_clk_get(pdev->dev.of_node, 0);
-	if (IS_ERR(clk)) {
-		dev_err(&pdev->dev, "no clock specified\n");
-		return PTR_ERR(clk);
+	xuartps_data = kzalloc(sizeof(*xuartps_data), GFP_KERNEL);
+	if (!xuartps_data)
+		return -ENOMEM;
+
+	xuartps_data->aperclk = clk_get(&pdev->dev, "aper_clk");
+	if (IS_ERR(xuartps_data->aperclk)) {
+		dev_err(&pdev->dev, "aper_clk clock not found.\n");
+		rc = PTR_ERR(xuartps_data->aperclk);
+		goto err_out_free;
+	}
+	xuartps_data->refclk = clk_get(&pdev->dev, "ref_clk");
+	if (IS_ERR(xuartps_data->refclk)) {
+		dev_err(&pdev->dev, "ref_clk clock not found.\n");
+		rc = PTR_ERR(xuartps_data->refclk);
+		goto err_out_clk_put_aper;
 	}
 
-	rc = clk_prepare_enable(clk);
+	rc = clk_prepare_enable(xuartps_data->aperclk);
+	if (rc) {
+		dev_err(&pdev->dev, "Unable to enable APER clock.\n");
+		goto err_out_clk_put;
+	}
+	rc = clk_prepare_enable(xuartps_data->refclk);
 	if (rc) {
-		dev_err(&pdev->dev, "could not enable clock\n");
-		return -EBUSY;
+		dev_err(&pdev->dev, "Unable to enable device clock.\n");
+		goto err_out_clk_dis_aper;
 	}
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res)
-		return -ENODEV;
+	if (!res) {
+		rc = -ENODEV;
+		goto err_out_clk_disable;
+	}
 
 	res2 = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-	if (!res2)
-		return -ENODEV;
+	if (!res2) {
+		rc = -ENODEV;
+		goto err_out_clk_disable;
+	}
 
 	/* Initialize the port structure */
 	port = xuartps_get_port();
 
 	if (!port) {
 		dev_err(&pdev->dev, "Cannot get uart_port structure\n");
-		return -ENODEV;
+		rc = -ENODEV;
+		goto err_out_clk_disable;
 	} else {
 		/* Register the port.
 		 * This function also registers this device with the tty layer
@@ -972,18 +1004,31 @@ static int xuartps_probe(struct platform_device *pdev)
 		port->mapbase = res->start;
 		port->irq = res2->start;
 		port->dev = &pdev->dev;
-		port->uartclk = clk_get_rate(clk);
-		port->private_data = clk;
+		port->uartclk = clk_get_rate(xuartps_data->refclk);
+		port->private_data = xuartps_data;
 		dev_set_drvdata(&pdev->dev, port);
 		rc = uart_add_one_port(&xuartps_uart_driver, port);
 		if (rc) {
 			dev_err(&pdev->dev,
 				"uart_add_one_port() failed; err=%i\n", rc);
 			dev_set_drvdata(&pdev->dev, NULL);
-			return rc;
+			goto err_out_clk_disable;
 		}
 		return 0;
 	}
+
+err_out_clk_disable:
+	clk_disable_unprepare(xuartps_data->refclk);
+err_out_clk_dis_aper:
+	clk_disable_unprepare(xuartps_data->aperclk);
+err_out_clk_put:
+	clk_put(xuartps_data->refclk);
+err_out_clk_put_aper:
+	clk_put(xuartps_data->aperclk);
+err_out_free:
+	kfree(xuartps_data);
+
+	return rc;
 }
 
 /**
@@ -995,14 +1040,18 @@ static int xuartps_probe(struct platform_device *pdev)
 static int xuartps_remove(struct platform_device *pdev)
 {
 	struct uart_port *port = dev_get_drvdata(&pdev->dev);
-	struct clk *clk = port->private_data;
+	struct xuartps *xuartps_data = port->private_data;
 	int rc;
 
 	/* Remove the xuartps port from the serial core */
 	rc = uart_remove_one_port(&xuartps_uart_driver, port);
 	dev_set_drvdata(&pdev->dev, NULL);
 	port->mapbase = 0;
-	clk_disable_unprepare(clk);
+	clk_disable_unprepare(xuartps_data->refclk);
+	clk_disable_unprepare(xuartps_data->aperclk);
+	clk_put(xuartps_data->refclk);
+	clk_put(xuartps_data->aperclk);
+	kfree(xuartps_data);
 	return rc;
 }
 

include/linux/clk/zynq.h

 /*
+ * Copyright (C) 2013 Xilinx Inc.
  * Copyright (C) 2012 National Instruments
  *
  * This program is free software; you can redistribute it and/or modify
@@ -19,6 +20,11 @@
 #ifndef __LINUX_CLK_ZYNQ_H_
 #define __LINUX_CLK_ZYNQ_H_
 
-void __init xilinx_zynq_clocks_init(void __iomem *slcr);
+#include <linux/spinlock.h>
 
+void zynq_clock_init(void __iomem *slcr);
+
+struct clk *clk_register_zynq_pll(const char *name, const char *parent,
+		void __iomem *pll_ctrl, void __iomem *pll_status, u8 lock_index,
+		spinlock_t *lock);
 #endif