clk: renesas: r8a7794: Add new CPG/MSSR driver

Add a new R-Car E2 Clock Pulse Generator / Module Standby and Software
Reset driver, using the CPG/MSSR driver core.  This will enable support
for module resets, which are not supported by the existing driver.

The old driver can still be used through a Kconfig option, to preserve
backward compatibility with old DTBs.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

drivers/clk/renesas/Kconfig

@@ -21,7 +21,7 @@ if CLK_RENESAS
 
 config CLK_RENESAS_LEGACY
 	bool "Legacy DT clock support"
-	depends on CLK_R8A7790 || CLK_R8A7791 || CLK_R8A7792
+	depends on CLK_R8A7790 || CLK_R8A7791 || CLK_R8A7792 || CLK_R8A7794
 	default y
 	help
 	  Enable backward compatibility with old device trees describing a
@@ -82,7 +82,8 @@ config CLK_R8A7792
 
 config CLK_R8A7794
 	bool
-	select CLK_RCAR_GEN2
+	select CLK_RCAR_GEN2 if CLK_RENESAS_LEGACY
+	select CLK_RCAR_GEN2_CPG
 	select CLK_RENESAS_DIV6
 
 config CLK_R8A7795

drivers/clk/renesas/Makefile

@@ -10,6 +10,7 @@ obj-$(CONFIG_CLK_R8A7779)		+= clk-r8a7779.o
 obj-$(CONFIG_CLK_R8A7790)		+= r8a7790-cpg-mssr.o
 obj-$(CONFIG_CLK_R8A7791)		+= r8a7791-cpg-mssr.o
 obj-$(CONFIG_CLK_R8A7792)		+= r8a7792-cpg-mssr.o
+obj-$(CONFIG_CLK_R8A7794)		+= r8a7794-cpg-mssr.o
 obj-$(CONFIG_CLK_R8A7795)		+= r8a7795-cpg-mssr.o
 obj-$(CONFIG_CLK_R8A7796)		+= r8a7796-cpg-mssr.o
 obj-$(CONFIG_CLK_SH73A0)		+= clk-sh73a0.o

drivers/clk/renesas/r8a7794-cpg-mssr.c

+/*
+ * r8a7794 Clock Pulse Generator / Module Standby and Software Reset
+ *
+ * Copyright (C) 2017 Glider bvba
+ *
+ * Based on clk-rcar-gen2.c
+ *
+ * Copyright (C) 2013 Ideas On Board SPRL
+ *
+ * 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; version 2 of the License.
+ */
+
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/soc/renesas/rcar-rst.h>
+
+#include <dt-bindings/clock/r8a7794-cpg-mssr.h>
+
+#include "renesas-cpg-mssr.h"
+#include "rcar-gen2-cpg.h"
+
+enum clk_ids {
+	/* Core Clock Outputs exported to DT */
+	LAST_DT_CORE_CLK = R8A7794_CLK_OSC,
+
+	/* External Input Clocks */
+	CLK_EXTAL,
+	CLK_USB_EXTAL,
+
+	/* Internal Core Clocks */
+	CLK_MAIN,
+	CLK_PLL0,
+	CLK_PLL1,
+	CLK_PLL3,
+	CLK_PLL1_DIV2,
+
+	/* Module Clocks */
+	MOD_CLK_BASE
+};
+
+static const struct cpg_core_clk r8a7794_core_clks[] __initconst = {
+	/* External Clock Inputs */
+	DEF_INPUT("extal",     CLK_EXTAL),
+	DEF_INPUT("usb_extal", CLK_USB_EXTAL),
+
+	/* Internal Core Clocks */
+	DEF_BASE(".main",       CLK_MAIN, CLK_TYPE_GEN2_MAIN, CLK_EXTAL),
+	DEF_BASE(".pll0",       CLK_PLL0, CLK_TYPE_GEN2_PLL0, CLK_MAIN),
+	DEF_BASE(".pll1",       CLK_PLL1, CLK_TYPE_GEN2_PLL1, CLK_MAIN),
+	DEF_BASE(".pll3",       CLK_PLL3, CLK_TYPE_GEN2_PLL3, CLK_MAIN),
+
+	DEF_FIXED(".pll1_div2", CLK_PLL1_DIV2, CLK_PLL1, 2, 1),
+
+	/* Core Clock Outputs */
+	DEF_BASE("lb",   R8A7794_CLK_LB,   CLK_TYPE_GEN2_LB,   CLK_PLL1),
+	DEF_BASE("adsp", R8A7794_CLK_ADSP, CLK_TYPE_GEN2_ADSP, CLK_PLL1),
+	DEF_BASE("sdh",  R8A7794_CLK_SDH,  CLK_TYPE_GEN2_SDH,  CLK_PLL1),
+	DEF_BASE("sd0",  R8A7794_CLK_SD0,  CLK_TYPE_GEN2_SD0,  CLK_PLL1),
+	DEF_BASE("qspi", R8A7794_CLK_QSPI, CLK_TYPE_GEN2_QSPI, CLK_PLL1_DIV2),
+	DEF_BASE("rcan", R8A7794_CLK_RCAN, CLK_TYPE_GEN2_RCAN, CLK_USB_EXTAL),
+
+	DEF_FIXED("z2",     R8A7794_CLK_Z2,    CLK_PLL0,          1, 1),
+	DEF_FIXED("zg",     R8A7794_CLK_ZG,    CLK_PLL1,          6, 1),
+	DEF_FIXED("zx",     R8A7794_CLK_ZX,    CLK_PLL1,          3, 1),
+	DEF_FIXED("zs",     R8A7794_CLK_ZS,    CLK_PLL1,          6, 1),
+	DEF_FIXED("hp",     R8A7794_CLK_HP,    CLK_PLL1,         12, 1),
+	DEF_FIXED("i",      R8A7794_CLK_I,     CLK_PLL1,          2, 1),
+	DEF_FIXED("b",      R8A7794_CLK_B,     CLK_PLL1,         12, 1),
+	DEF_FIXED("p",      R8A7794_CLK_P,     CLK_PLL1,         24, 1),
+	DEF_FIXED("cl",     R8A7794_CLK_CL,    CLK_PLL1,         48, 1),
+	DEF_FIXED("cp",     R8A7794_CLK_CP,    CLK_PLL1,         48, 1),
+	DEF_FIXED("m2",     R8A7794_CLK_M2,    CLK_PLL1,          8, 1),
+	DEF_FIXED("zb3",    R8A7794_CLK_ZB3,   CLK_PLL3,          4, 1),
+	DEF_FIXED("zb3d2",  R8A7794_CLK_ZB3D2, CLK_PLL3,          8, 1),
+	DEF_FIXED("ddr",    R8A7794_CLK_DDR,   CLK_PLL3,          8, 1),
+	DEF_FIXED("mp",     R8A7794_CLK_MP,    CLK_PLL1_DIV2,    15, 1),
+	DEF_FIXED("cpex",   R8A7794_CLK_CPEX,  CLK_EXTAL,         2, 1),
+	DEF_FIXED("r",      R8A7794_CLK_R,     CLK_PLL1,      49152, 1),
+	DEF_FIXED("osc",    R8A7794_CLK_OSC,   CLK_PLL1,      12288, 1),
+
+	DEF_DIV6P1("sd2",   R8A7794_CLK_SD2,   CLK_PLL1_DIV2, 0x078),
+	DEF_DIV6P1("sd3",   R8A7794_CLK_SD3,   CLK_PLL1_DIV2, 0x26c),
+	DEF_DIV6P1("mmc0",  R8A7794_CLK_MMC0,  CLK_PLL1_DIV2, 0x240),
+};
+
+static const struct mssr_mod_clk r8a7794_mod_clks[] __initconst = {
+	DEF_MOD("msiof0",		   0,	R8A7794_CLK_MP),
+	DEF_MOD("vcp0",			 101,	R8A7794_CLK_ZS),
+	DEF_MOD("vpc0",			 103,	R8A7794_CLK_ZS),
+	DEF_MOD("jpu",			 106,	R8A7794_CLK_M2),
+	DEF_MOD("tmu1",			 111,	R8A7794_CLK_P),
+	DEF_MOD("3dg",			 112,	R8A7794_CLK_ZG),
+	DEF_MOD("2d-dmac",		 115,	R8A7794_CLK_ZS),
+	DEF_MOD("fdp1-0",		 119,	R8A7794_CLK_ZS),
+	DEF_MOD("tmu3",			 121,	R8A7794_CLK_P),
+	DEF_MOD("tmu2",			 122,	R8A7794_CLK_P),
+	DEF_MOD("cmt0",			 124,	R8A7794_CLK_R),
+	DEF_MOD("tmu0",			 125,	R8A7794_CLK_CP),
+	DEF_MOD("vsp1du0",		 128,	R8A7794_CLK_ZS),
+	DEF_MOD("vsp1-sy",		 131,	R8A7794_CLK_ZS),
+	DEF_MOD("scifa2",		 202,	R8A7794_CLK_MP),
+	DEF_MOD("scifa1",		 203,	R8A7794_CLK_MP),
+	DEF_MOD("scifa0",		 204,	R8A7794_CLK_MP),
+	DEF_MOD("msiof2",		 205,	R8A7794_CLK_MP),
+	DEF_MOD("scifb0",		 206,	R8A7794_CLK_MP),
+	DEF_MOD("scifb1",		 207,	R8A7794_CLK_MP),
+	DEF_MOD("msiof1",		 208,	R8A7794_CLK_MP),
+	DEF_MOD("scifb2",		 216,	R8A7794_CLK_MP),
+	DEF_MOD("sys-dmac1",		 218,	R8A7794_CLK_ZS),
+	DEF_MOD("sys-dmac0",		 219,	R8A7794_CLK_ZS),
+	DEF_MOD("tpu0",			 304,	R8A7794_CLK_CP),
+	DEF_MOD("sdhi3",		 311,	R8A7794_CLK_SD3),
+	DEF_MOD("sdhi2",		 312,	R8A7794_CLK_SD2),
+	DEF_MOD("sdhi0",		 314,	R8A7794_CLK_SD0),
+	DEF_MOD("mmcif0",		 315,	R8A7794_CLK_MMC0),
+	DEF_MOD("iic0",			 318,	R8A7794_CLK_HP),
+	DEF_MOD("iic1",			 323,	R8A7794_CLK_HP),
+	DEF_MOD("cmt1",			 329,	R8A7794_CLK_R),
+	DEF_MOD("usbhs-dmac0",		 330,	R8A7794_CLK_HP),
+	DEF_MOD("usbhs-dmac1",		 331,	R8A7794_CLK_HP),
+	DEF_MOD("irqc",			 407,	R8A7794_CLK_CP),
+	DEF_MOD("intc-sys",		 408,	R8A7794_CLK_ZS),
+	DEF_MOD("audio-dmac0",		 502,	R8A7794_CLK_HP),
+	DEF_MOD("adsp_mod",		 506,	R8A7794_CLK_ADSP),
+	DEF_MOD("pwm",			 523,	R8A7794_CLK_P),
+	DEF_MOD("usb-ehci",		 703,	R8A7794_CLK_MP),
+	DEF_MOD("usbhs",		 704,	R8A7794_CLK_HP),
+	DEF_MOD("hscif2",		 713,	R8A7794_CLK_ZS),
+	DEF_MOD("scif5",		 714,	R8A7794_CLK_P),
+	DEF_MOD("scif4",		 715,	R8A7794_CLK_P),
+	DEF_MOD("hscif1",		 716,	R8A7794_CLK_ZS),
+	DEF_MOD("hscif0",		 717,	R8A7794_CLK_ZS),
+	DEF_MOD("scif3",		 718,	R8A7794_CLK_P),
+	DEF_MOD("scif2",		 719,	R8A7794_CLK_P),
+	DEF_MOD("scif1",		 720,	R8A7794_CLK_P),
+	DEF_MOD("scif0",		 721,	R8A7794_CLK_P),
+	DEF_MOD("du1",			 723,	R8A7794_CLK_ZX),
+	DEF_MOD("du0",			 724,	R8A7794_CLK_ZX),
+	DEF_MOD("ipmmu-sgx",		 800,	R8A7794_CLK_ZX),
+	DEF_MOD("mlb",			 802,	R8A7794_CLK_HP),
+	DEF_MOD("vin1",			 810,	R8A7794_CLK_ZG),
+	DEF_MOD("vin0",			 811,	R8A7794_CLK_ZG),
+	DEF_MOD("etheravb",		 812,	R8A7794_CLK_HP),
+	DEF_MOD("ether",		 813,	R8A7794_CLK_P),
+	DEF_MOD("gyro-adc",		 901,	R8A7794_CLK_P),
+	DEF_MOD("gpio6",		 905,	R8A7794_CLK_CP),
+	DEF_MOD("gpio5",		 907,	R8A7794_CLK_CP),
+	DEF_MOD("gpio4",		 908,	R8A7794_CLK_CP),
+	DEF_MOD("gpio3",		 909,	R8A7794_CLK_CP),
+	DEF_MOD("gpio2",		 910,	R8A7794_CLK_CP),
+	DEF_MOD("gpio1",		 911,	R8A7794_CLK_CP),
+	DEF_MOD("gpio0",		 912,	R8A7794_CLK_CP),
+	DEF_MOD("can1",			 915,	R8A7794_CLK_P),
+	DEF_MOD("can0",			 916,	R8A7794_CLK_P),
+	DEF_MOD("qspi_mod",		 917,	R8A7794_CLK_QSPI),
+	DEF_MOD("i2c5",			 925,	R8A7794_CLK_HP),
+	DEF_MOD("i2c4",			 927,	R8A7794_CLK_HP),
+	DEF_MOD("i2c3",			 928,	R8A7794_CLK_HP),
+	DEF_MOD("i2c2",			 929,	R8A7794_CLK_HP),
+	DEF_MOD("i2c1",			 930,	R8A7794_CLK_HP),
+	DEF_MOD("i2c0",			 931,	R8A7794_CLK_HP),
+	DEF_MOD("ssi-all",		1005,	R8A7794_CLK_P),
+	DEF_MOD("ssi9",			1006,	MOD_CLK_ID(1005)),
+	DEF_MOD("ssi8",			1007,	MOD_CLK_ID(1005)),
+	DEF_MOD("ssi7",			1008,	MOD_CLK_ID(1005)),
+	DEF_MOD("ssi6",			1009,	MOD_CLK_ID(1005)),
+	DEF_MOD("ssi5",			1010,	MOD_CLK_ID(1005)),
+	DEF_MOD("ssi4",			1011,	MOD_CLK_ID(1005)),
+	DEF_MOD("ssi3",			1012,	MOD_CLK_ID(1005)),
+	DEF_MOD("ssi2",			1013,	MOD_CLK_ID(1005)),
+	DEF_MOD("ssi1",			1014,	MOD_CLK_ID(1005)),
+	DEF_MOD("ssi0",			1015,	MOD_CLK_ID(1005)),
+	DEF_MOD("scu-all",		1017,	R8A7794_CLK_P),
+	DEF_MOD("scu-dvc1",		1018,	MOD_CLK_ID(1017)),
+	DEF_MOD("scu-dvc0",		1019,	MOD_CLK_ID(1017)),
+	DEF_MOD("scu-ctu1-mix1",	1020,	MOD_CLK_ID(1017)),
+	DEF_MOD("scu-ctu0-mix0",	1021,	MOD_CLK_ID(1017)),
+	DEF_MOD("scu-src6",		1025,	MOD_CLK_ID(1017)),
+	DEF_MOD("scu-src5",		1026,	MOD_CLK_ID(1017)),
+	DEF_MOD("scu-src4",		1027,	MOD_CLK_ID(1017)),
+	DEF_MOD("scu-src3",		1028,	MOD_CLK_ID(1017)),
+	DEF_MOD("scu-src2",		1029,	MOD_CLK_ID(1017)),
+	DEF_MOD("scu-src1",		1030,	MOD_CLK_ID(1017)),
+	DEF_MOD("scifa3",		1106,	R8A7794_CLK_MP),
+	DEF_MOD("scifa4",		1107,	R8A7794_CLK_MP),
+	DEF_MOD("scifa5",		1108,	R8A7794_CLK_MP),
+};
+
+static const unsigned int r8a7794_crit_mod_clks[] __initconst = {
+	MOD_CLK_ID(408),	/* INTC-SYS (GIC) */
+};
+
+/*
+ * CPG Clock Data
+ */
+
+/*
+ *   MD		EXTAL		PLL0	PLL1	PLL3
+ * 14 13 19	(MHz)		*1	*2
+ *---------------------------------------------------
+ * 0  0  1	15		x200/3	x208/2	x88
+ * 0  1  1	20		x150/3	x156/2	x66
+ * 1  0  1	26 / 2		x230/3	x240/2	x102
+ * 1  1  1	30 / 2		x200/3	x208/2	x88
+ *
+ * *1 :	Table 7.5c indicates VCO output (PLL0 = VCO/3)
+ * *2 :	Table 7.5c indicates VCO output (PLL1 = VCO/2)
+ */
+#define CPG_PLL_CONFIG_INDEX(md)	((((md) & BIT(14)) >> 13) | \
+					 (((md) & BIT(13)) >> 13))
+static const struct rcar_gen2_cpg_pll_config cpg_pll_configs[4] __initconst = {
+	{ 1, 208,  88, 200 },
+	{ 1, 156,  66, 150 },
+	{ 2, 240, 102, 230 },
+	{ 2, 208,  88, 200 },
+};
+
+static int __init r8a7794_cpg_mssr_init(struct device *dev)
+{
+	const struct rcar_gen2_cpg_pll_config *cpg_pll_config;
+	u32 cpg_mode;
+	int error;
+
+	error = rcar_rst_read_mode_pins(&cpg_mode);
+	if (error)
+		return error;
+
+	cpg_pll_config = &cpg_pll_configs[CPG_PLL_CONFIG_INDEX(cpg_mode)];
+
+	return rcar_gen2_cpg_init(cpg_pll_config, 3, cpg_mode);
+}
+
+const struct cpg_mssr_info r8a7794_cpg_mssr_info __initconst = {
+	/* Core Clocks */
+	.core_clks = r8a7794_core_clks,
+	.num_core_clks = ARRAY_SIZE(r8a7794_core_clks),
+	.last_dt_core_clk = LAST_DT_CORE_CLK,
+	.num_total_core_clks = MOD_CLK_BASE,
+
+	/* Module Clocks */
+	.mod_clks = r8a7794_mod_clks,
+	.num_mod_clks = ARRAY_SIZE(r8a7794_mod_clks),
+	.num_hw_mod_clks = 12 * 32,
+
+	/* Critical Module Clocks */
+	.crit_mod_clks = r8a7794_crit_mod_clks,
+	.num_crit_mod_clks = ARRAY_SIZE(r8a7794_crit_mod_clks),
+
+	/* Callbacks */
+	.init = r8a7794_cpg_mssr_init,
+	.cpg_clk_register = rcar_gen2_cpg_clk_register,
+};

drivers/clk/renesas/renesas-cpg-mssr.c

@@ -662,6 +662,12 @@ static const struct of_device_id cpg_mssr_match[] = {
 		.data = &r8a7792_cpg_mssr_info,
 	},
 #endif
+#ifdef CONFIG_CLK_R8A7794
+	{
+		.compatible = "renesas,r8a7794-cpg-mssr",
+		.data = &r8a7794_cpg_mssr_info,
+	},
+#endif
 #ifdef CONFIG_CLK_R8A7795
 	{
 		.compatible = "renesas,r8a7795-cpg-mssr",

drivers/clk/renesas/renesas-cpg-mssr.h

@@ -135,6 +135,7 @@ extern const struct cpg_mssr_info r8a7745_cpg_mssr_info;
 extern const struct cpg_mssr_info r8a7790_cpg_mssr_info;
 extern const struct cpg_mssr_info r8a7791_cpg_mssr_info;
 extern const struct cpg_mssr_info r8a7792_cpg_mssr_info;
+extern const struct cpg_mssr_info r8a7794_cpg_mssr_info;
 extern const struct cpg_mssr_info r8a7795_cpg_mssr_info;
 extern const struct cpg_mssr_info r8a7796_cpg_mssr_info;