clk: renesas: r8a77995: Correct RCLK handling

According to R-Car Gen3 Hardware Manual Rev.1.00, R-Car D3 has the
RCLK Frequency Control Register (RCKCR), which determines the OSC and
RINT predivider values, and selection of the RCLK clock source between
RINT and the On-Chip Oscillator.

Hence change the OSC and RINT clock definitions to use the RCKCR
divider, and add the missing On-Chip Oscillator and RCLK clock source
switching logic.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>

drivers/clk/renesas/r8a77995-cpg-mssr.c

@@ -46,6 +46,8 @@ enum clk_ids {
 	CLK_S3,
 	CLK_SDSRC,
 	CLK_SSPSRC,
+	CLK_RINT,
+	CLK_OCO,
 
 	/* Module Clocks */
 	MOD_CLK_BASE
@@ -72,6 +74,10 @@ static const struct cpg_core_clk r8a77995_core_clks[] __initconst = {
 	DEF_FIXED(".s3",       CLK_S3,             CLK_PLL1,       6, 1),
 	DEF_FIXED(".sdsrc",    CLK_SDSRC,          CLK_PLL1,       2, 1),
 
+	DEF_DIV6_RO(".r",      CLK_RINT,           CLK_EXTAL, CPG_RCKCR, 32),
+
+	DEF_RATE(".oco",       CLK_OCO,            8 * 1000 * 1000),
+
 	/* Core Clock Outputs */
 	DEF_FIXED("z2",        R8A77995_CLK_Z2,    CLK_PLL0D3,     1, 1),
 	DEF_FIXED("ztr",       R8A77995_CLK_ZTR,   CLK_PLL1,       6, 1),
@@ -90,8 +96,8 @@ static const struct cpg_core_clk r8a77995_core_clks[] __initconst = {
 
 	DEF_FIXED("cl",        R8A77995_CLK_CL,    CLK_PLL1,      48, 1),
 	DEF_FIXED("cp",        R8A77995_CLK_CP,    CLK_EXTAL,      2, 1),
-	DEF_FIXED("osc",       R8A77995_CLK_OSC,   CLK_EXTAL,    384, 1),
-	DEF_FIXED("r",         R8A77995_CLK_R,     CLK_EXTAL,   1536, 1),
+
+	DEF_DIV6_RO("osc",     R8A77995_CLK_OSC,   CLK_EXTAL, CPG_RCKCR,  8),
 
 	DEF_GEN3_PE("s1d4c",   R8A77995_CLK_S1D4C, CLK_S1, 4, CLK_PE, 2),
 	DEF_GEN3_PE("s3d1c",   R8A77995_CLK_S3D1C, CLK_S3, 1, CLK_PE, 1),
@@ -102,6 +108,8 @@ static const struct cpg_core_clk r8a77995_core_clks[] __initconst = {
 
 	DEF_DIV6P1("canfd",    R8A77995_CLK_CANFD, CLK_PLL0D3,    0x244),
 	DEF_DIV6P1("mso",      R8A77995_CLK_MSO,   CLK_PLL1D2,    0x014),
+
+	DEF_GEN3_RCKSEL("r",   R8A77995_CLK_R, CLK_RINT, 1, CLK_OCO, 61 * 4),
 };
 
 static const struct mssr_mod_clk r8a77995_mod_clks[] __initconst = {