clk: clk_stm32f: Add DSI clock support

DSI clock is available on STM32F769-disco and
STM32F469-disco board.

Signed-off-by: Yannick Fertre <yannick.fertre@st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>

drivers/clk/clk_stm32f.c

@@ -432,7 +432,7 @@ static ulong stm32_clk_get_rate(struct clk *clk)
 		return (sysclk >> stm32_get_apb_shift(regs, APB1));
 
 	/* APB2 CLOCK */
-	case STM32F7_APB2_CLOCK(TIM1) ... STM32F7_APB2_CLOCK(LTDC):
+	case STM32F7_APB2_CLOCK(TIM1) ... STM32F7_APB2_CLOCK(DSI):
 		switch (clk->id) {
 		/*
 		 * particular case for SDMMC1 and SDMMC2 :

include/dt-bindings/mfd/stm32f7-rcc.h

@@ -106,6 +106,7 @@
 #define STM32F7_RCC_APB2_SAI1		22
 #define STM32F7_RCC_APB2_SAI2		23
 #define STM32F7_RCC_APB2_LTDC		26
+#define STM32F7_RCC_APB2_DSI		27
 
 #define STM32F7_APB2_RESET(bit)	(STM32F7_RCC_APB2_##bit + (0x24 * 8))
 #define STM32F7_APB2_CLOCK(bit)	(STM32F7_RCC_APB2_##bit + 0xA0)