Add support for the SMUX2_DSI0_CLK and SMUX2_DSI1_CLK clock muxes
present on the r9a09g047 SoC.

These muxes select between CDIV7_DSI{0,1}_CLK and CSDIV_2to16_PLLDSI{0,1}
using the CPG_SSEL3 register (SELCTL0 and SELCTL1 bits).

According to the hardware manual, when LVDS0 or LVDS1 outputs are used,
SELCTL0 or SELCTL1 must be set accordingly.

Signed-off-by: Tommaso Merciai <tommaso.merciai.xr@bp.renesas.com>
---
 drivers/clk/renesas/r9a09g047-cpg.c | 8 ++++++++
 drivers/clk/renesas/rzv2h-cpg.h     | 3 +++
 2 files changed, 11 insertions(+)

diff --git a/drivers/clk/renesas/r9a09g047-cpg.c b/drivers/clk/renesas/r9a09g047-cpg.c
index aa6528b72cef..c8863eded44d 100644
--- a/drivers/clk/renesas/r9a09g047-cpg.c
+++ b/drivers/clk/renesas/r9a09g047-cpg.c
@@ -64,6 +64,8 @@ enum clk_ids {
 	CLK_SMUX2_GBE0_RXCLK,
 	CLK_SMUX2_GBE1_TXCLK,
 	CLK_SMUX2_GBE1_RXCLK,
+	CLK_SMUX2_DSI0_CLK,
+	CLK_SMUX2_DSI1_CLK,
 	CLK_PLLDTY_DIV16,
 	CLK_PLLVDO_CRU0,
 	CLK_PLLVDO_GPU,
@@ -143,6 +145,8 @@ RZG3E_CPG_PLL_DSI1_LIMITS(rzg3e_cpg_pll_dsi1_limits);
 #define PLLDSI1		PLL_PACK_LIMITS(0x160, 1, 1, &rzg3e_cpg_pll_dsi1_limits)
 
 /* Mux clock tables */
+static const char * const smux2_dsi0_clk[] = { ".plldsi0_div7", ".plldsi0_csdiv" };
+static const char * const smux2_dsi1_clk[] = { ".plldsi1_div7", ".plldsi1_csdiv" };
 static const char * const smux2_gbe0_rxclk[] = { ".plleth_gbe0", "et0_rxclk" };
 static const char * const smux2_gbe0_txclk[] = { ".plleth_gbe0", "et0_txclk" };
 static const char * const smux2_gbe1_rxclk[] = { ".plleth_gbe1", "et1_rxclk" };
@@ -218,6 +222,10 @@ static const struct cpg_core_clk r9a09g047_core_clks[] __initconst = {
 		       CSDIV1_DIVCTL3, dtable_2_16_plldsi),
 	DEF_FIXED(".plldsi0_div7", CLK_PLLDSI0_DIV7, CLK_PLLDSI0, 1, 7),
 	DEF_FIXED(".plldsi1_div7", CLK_PLLDSI1_DIV7, CLK_PLLDSI1, 1, 7),
+	DEF_PLLDSI_SMUX(".smux2_dsi0_clk", CLK_SMUX2_DSI0_CLK,
+			SSEL3_SELCTL0, smux2_dsi0_clk),
+	DEF_PLLDSI_SMUX(".smux2_dsi1_clk", CLK_SMUX2_DSI1_CLK,
+			SSEL3_SELCTL1, smux2_dsi1_clk),
 
 	/* Core Clocks */
 	DEF_FIXED("sys_0_pclk", R9A09G047_SYS_0_PCLK, CLK_QEXTAL, 1, 1),
diff --git a/drivers/clk/renesas/rzv2h-cpg.h b/drivers/clk/renesas/rzv2h-cpg.h
index af881ff98b31..4492f4e7b9ae 100644
--- a/drivers/clk/renesas/rzv2h-cpg.h
+++ b/drivers/clk/renesas/rzv2h-cpg.h
@@ -121,6 +121,7 @@ struct fixed_mod_conf {
 
 #define CPG_SSEL0		(0x300)
 #define CPG_SSEL1		(0x304)
+#define CPG_SSEL3		(0x30C)
 #define CPG_CDDIV0		(0x400)
 #define CPG_CDDIV1		(0x404)
 #define CPG_CDDIV2		(0x408)
@@ -156,6 +157,8 @@ struct fixed_mod_conf {
 #define SSEL1_SELCTL1	SMUX_PACK(CPG_SSEL1, 4, 1)
 #define SSEL1_SELCTL2	SMUX_PACK(CPG_SSEL1, 8, 1)
 #define SSEL1_SELCTL3	SMUX_PACK(CPG_SSEL1, 12, 1)
+#define SSEL3_SELCTL0	SMUX_PACK(CPG_SSEL3, 0, 1)
+#define SSEL3_SELCTL1	SMUX_PACK(CPG_SSEL3, 4, 1)
 
 #define BUS_MSTOP_IDX_MASK	GENMASK(31, 16)
 #define BUS_MSTOP_BITS_MASK	GENMASK(15, 0)
-- 
2.43.0