clk: renesas: r9a07g044: Add mux and divider for G clock

G clock is sourced from PLL3 and PLL6. The output of the mux is
connected to divider.

This patch adds a mux and divider for getting different rates from
this clock sources.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://lore.kernel.org/r/20211203115154.31864-3-biju.das.jz@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

drivers/clk/renesas/r9a07g044-cpg.c

@@ -50,6 +50,7 @@ enum clk_ids {
 	CLK_PLL2_SDHI_266,
 	CLK_SD0_DIV4,
 	CLK_SD1_DIV4,
+	CLK_SEL_GPU2,
 
 	/* Module Clocks */
 	MOD_CLK_BASE,
@@ -77,6 +78,7 @@ static const struct clk_div_table dtable_1_32[] = {
 static const char * const sel_pll3_3[] = { ".pll3_533", ".pll3_400" };
 static const char * const sel_pll6_2[]	= { ".pll6_250", ".pll5_250" };
 static const char * const sel_shdi[] = { ".clk_533", ".clk_400", ".clk_266" };
+static const char * const sel_gpu2[] = { ".pll6", ".pll3_div2_2" };
 
 static const struct cpg_core_clk r9a07g044_core_clks[] __initconst = {
 	/* External Clock Inputs */
@@ -116,6 +118,8 @@ static const struct cpg_core_clk r9a07g044_core_clks[] __initconst = {
 
 	DEF_FIXED(".pll5_250", CLK_PLL5_250, CLK_PLL5_FOUT3, 1, 2),
 	DEF_FIXED(".pll6_250", CLK_PLL6_250, CLK_PLL6, 1, 2),
+	DEF_MUX(".sel_gpu2", CLK_SEL_GPU2, SEL_GPU2,
+		sel_gpu2, ARRAY_SIZE(sel_gpu2), 0, CLK_MUX_READ_ONLY),
 
 	/* Core output clk */
 	DEF_DIV("I", R9A07G044_CLK_I, CLK_PLL1, DIVPL1A, dtable_1_8,
@@ -141,6 +145,8 @@ static const struct cpg_core_clk r9a07g044_core_clks[] __initconst = {
 		   sel_shdi, ARRAY_SIZE(sel_shdi)),
 	DEF_FIXED("SD0_DIV4", CLK_SD0_DIV4, R9A07G044_CLK_SD0, 1, 4),
 	DEF_FIXED("SD1_DIV4", CLK_SD1_DIV4, R9A07G044_CLK_SD1, 1, 4),
+	DEF_DIV("G", R9A07G044_CLK_G, CLK_SEL_GPU2, DIVGPU, dtable_1_8,
+		CLK_DIVIDER_HIWORD_MASK),
 };
 
 static struct rzg2l_mod_clk r9a07g044_mod_clks[] = {

drivers/clk/renesas/rzg2l-cpg.h

@@ -12,9 +12,11 @@
 #define CPG_PL1_DDIV		(0x200)
 #define CPG_PL2_DDIV		(0x204)
 #define CPG_PL3A_DDIV		(0x208)
+#define CPG_PL6_DDIV		(0x210)
 #define CPG_PL2SDHI_DSEL	(0x218)
 #define CPG_CLKSTATUS		(0x280)
 #define CPG_PL3_SSEL		(0x408)
+#define CPG_PL6_SSEL		(0x414)
 #define CPG_PL6_ETH_SSEL	(0x418)
 
 #define CPG_CLKSTATUS_SELSDHI0_STS	BIT(28)
@@ -35,12 +37,14 @@
 #define DIVPL3A		DDIV_PACK(CPG_PL3A_DDIV, 0, 3)
 #define DIVPL3B		DDIV_PACK(CPG_PL3A_DDIV, 4, 3)
 #define DIVPL3C		DDIV_PACK(CPG_PL3A_DDIV, 8, 3)
+#define DIVGPU		DDIV_PACK(CPG_PL6_DDIV, 0, 2)
 
 #define SEL_PLL_PACK(offset, bitpos, size) \
 		(((offset) << 20) | ((bitpos) << 12) | ((size) << 8))
 
 #define SEL_PLL3_3	SEL_PLL_PACK(CPG_PL3_SSEL, 8, 1)
 #define SEL_PLL6_2	SEL_PLL_PACK(CPG_PL6_ETH_SSEL, 0, 1)
+#define SEL_GPU2	SEL_PLL_PACK(CPG_PL6_SSEL, 12, 1)
 
 #define SEL_SDHI0	DDIV_PACK(CPG_PL2SDHI_DSEL, 0, 2)
 #define SEL_SDHI1	DDIV_PACK(CPG_PL2SDHI_DSEL, 4, 2)