[U-Boot] clk: rmobile: Add RPC hyperflash clock

diff --git a/drivers/clk/renesas/clk-rcar-gen3.c b/drivers/clk/renesas/clk-rcar-gen3.c
index 3326b61f3a..c821bddc25 100644
--- a/drivers/clk/renesas/clk-rcar-gen3.c
+++ b/drivers/clk/renesas/clk-rcar-gen3.c
@@ -27,6 +27,11 @@ 
 #define CPG_PLL2CR		0x002c
 #define CPG_PLL4CR		0x01f4
 
+#define CPG_RPC_PREDIV_MASK	0x3
+#define CPG_RPC_PREDIV_OFFSET	3
+#define CPG_RPC_POSTDIV_MASK	0x7
+#define CPG_RPC_POSTDIV_OFFSET	0
+
 /*
  * Module Standby and Software Reset register offets.
  *
@@ -119,6 +124,8 @@  enum clk_types {
 	DEF_BASE(_name, _id, CLK_TYPE_FF, _parent, .div = _div, .mult = _mult)
 #define DEF_GEN3_SD(_name, _id, _parent, _offset)	\
 	DEF_BASE(_name, _id, CLK_TYPE_GEN3_SD, _parent, .offset = _offset)
+#define DEF_GEN3_RPC(_name, _id, _parent, _offset)	\
+	DEF_BASE(_name, _id, CLK_TYPE_GEN3_RPC, _parent, .offset = _offset)
 
 /*
  * Definitions of Module Clocks
@@ -145,6 +152,7 @@  enum rcar_gen3_clk_types {
 	CLK_TYPE_GEN3_PLL3,
 	CLK_TYPE_GEN3_PLL4,
 	CLK_TYPE_GEN3_SD,
+	CLK_TYPE_GEN3_RPC,
 	CLK_TYPE_GEN3_R,
 };
 
@@ -176,6 +184,7 @@  enum clk_ids {
 	CLK_S2,
 	CLK_S3,
 	CLK_SDSRC,
+	CLK_RPCSRC,
 	CLK_SSPSRC,
 	CLK_RINT,
 
@@ -203,6 +212,7 @@  static const struct cpg_core_clk r8a7795_core_clks[] = {
 	DEF_FIXED(".s2",        CLK_S2,            CLK_PLL1_DIV2,  4, 1),
 	DEF_FIXED(".s3",        CLK_S3,            CLK_PLL1_DIV2,  6, 1),
 	DEF_FIXED(".sdsrc",     CLK_SDSRC,         CLK_PLL1_DIV2,  2, 1),
+	DEF_FIXED(".rpcsrc",    CLK_RPCSRC,        CLK_PLL1,       2, 1),
 
 	/* Core Clock Outputs */
 	DEF_FIXED("ztr",        R8A7795_CLK_ZTR,   CLK_PLL1_DIV2,  6, 1),
@@ -231,6 +241,8 @@  static const struct cpg_core_clk r8a7795_core_clks[] = {
 	DEF_GEN3_SD("sd2",      R8A7795_CLK_SD2,   CLK_SDSRC,     0x268),
 	DEF_GEN3_SD("sd3",      R8A7795_CLK_SD3,   CLK_SDSRC,     0x26c),
 
+	DEF_GEN3_RPC("rpc",     R8A7795_CLK_RPC,   CLK_RPCSRC,    0x238),
+
 	DEF_FIXED("cl",         R8A7795_CLK_CL,    CLK_PLL1_DIV2, 48, 1),
 	DEF_FIXED("cp",         R8A7795_CLK_CP,    CLK_EXTAL,      2, 1),
 
@@ -358,6 +370,7 @@  static const struct mssr_mod_clk r8a7795_mod_clks[] = {
 	DEF_MOD("can-fd",		 914,	R8A7795_CLK_S3D2),
 	DEF_MOD("can-if1",		 915,	R8A7795_CLK_S3D4),
 	DEF_MOD("can-if0",		 916,	R8A7795_CLK_S3D4),
+	DEF_MOD("rpc",			 917,	R8A7795_CLK_RPC),
 	DEF_MOD("i2c6",			 918,	R8A7795_CLK_S0D6),
 	DEF_MOD("i2c5",			 919,	R8A7795_CLK_S0D6),
 	DEF_MOD("i2c-dvfs",		 926,	R8A7795_CLK_CP),
@@ -414,6 +427,7 @@  static const struct cpg_core_clk r8a7796_core_clks[] = {
 	DEF_FIXED(".s2",        CLK_S2,            CLK_PLL1_DIV2,  4, 1),
 	DEF_FIXED(".s3",        CLK_S3,            CLK_PLL1_DIV2,  6, 1),
 	DEF_FIXED(".sdsrc",     CLK_SDSRC,         CLK_PLL1_DIV2,  2, 1),
+	DEF_FIXED(".rpcsrc",    CLK_RPCSRC,        CLK_PLL1,       2, 1),
 
 	/* Core Clock Outputs */
 	DEF_FIXED("ztr",        R8A7796_CLK_ZTR,   CLK_PLL1_DIV2,  6, 1),
@@ -442,6 +456,8 @@  static const struct cpg_core_clk r8a7796_core_clks[] = {
 	DEF_GEN3_SD("sd2",      R8A7796_CLK_SD2,   CLK_SDSRC,     0x268),
 	DEF_GEN3_SD("sd3",      R8A7796_CLK_SD3,   CLK_SDSRC,     0x26c),
 
+	DEF_GEN3_RPC("rpc",     R8A7796_CLK_RPC,   CLK_RPCSRC,    0x238),
+
 	DEF_FIXED("cl",         R8A7796_CLK_CL,    CLK_PLL1_DIV2, 48, 1),
 	DEF_FIXED("cp",         R8A7796_CLK_CP,    CLK_EXTAL,      2, 1),
 
@@ -541,6 +557,7 @@  static const struct mssr_mod_clk r8a7796_mod_clks[] = {
 	DEF_MOD("can-fd",		 914,	R8A7796_CLK_S3D2),
 	DEF_MOD("can-if1",		 915,	R8A7796_CLK_S3D4),
 	DEF_MOD("can-if0",		 916,	R8A7796_CLK_S3D4),
+	DEF_MOD("rpc",			 917,	R8A7795_CLK_RPC),
 	DEF_MOD("i2c6",			 918,	R8A7796_CLK_S0D6),
 	DEF_MOD("i2c5",			 919,	R8A7796_CLK_S0D6),
 	DEF_MOD("i2c-dvfs",		 926,	R8A7796_CLK_CP),
@@ -827,7 +844,7 @@  static ulong gen3_clk_get_rate(struct clk *clk)
 	const struct cpg_core_clk *core;
 	const struct rcar_gen3_cpg_pll_config *pll_config =
 					priv->cpg_pll_config;
-	u32 value, mult, rate = 0;
+	u32 value, mult, prediv, postdiv, rate = 0;
 	int i, ret;
 
 	debug("%s[%i] Clock: id=%lu\n", __func__, __LINE__, clk->id);
@@ -937,6 +954,31 @@  static ulong gen3_clk_get_rate(struct clk *clk)
 		}
 
 		return -EINVAL;
+
+	case CLK_TYPE_GEN3_RPC:
+		rate = gen3_clk_get_rate(&parent);
+
+		value = readl(priv->base + core->offset);
+
+		prediv = (value >> CPG_RPC_PREDIV_OFFSET) &
+			 CPG_RPC_PREDIV_MASK;
+		if (prediv == 2)
+			rate /= 5;
+		else if (prediv == 3)
+			rate /= 6;
+		else
+			return -EINVAL;
+
+		postdiv = (value >> CPG_RPC_POSTDIV_OFFSET) &
+			  CPG_RPC_POSTDIV_MASK;
+		rate /= postdiv + 1;
+
+		debug("%s[%i] RPC clk: parent=%i prediv=%i postdiv=%i => rate=%u\n",
+		      __func__, __LINE__,
+		      core->parent, prediv, postdiv, rate);
+
+		return -EINVAL;
+
 	}
 
 	printf("%s[%i] unknown fail\n", __func__, __LINE__);