clk: stm32mp1: Add VREF clock gating

Add VREF clock gating, that may be used by STM32 VREFBUF regulator.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>

drivers/clk/clk_stm32mp1.c

@@ -100,6 +100,7 @@
 #define RCC_USBCKSELR		0x91C
 #define RCC_MP_APB1ENSETR	0xA00
 #define RCC_MP_APB2ENSETR	0XA08
+#define RCC_MP_APB3ENSETR	0xA10
 #define RCC_MP_AHB2ENSETR	0xA18
 #define RCC_MP_AHB4ENSETR	0xA28
 
@@ -508,6 +509,8 @@ static const struct stm32mp1_clk_gate stm32mp1_clk_gate[] = {
 
 	STM32MP1_CLK_SET_CLR(RCC_MP_APB2ENSETR, 13, USART6_K, _UART6_SEL),
 
+	STM32MP1_CLK_SET_CLR_F(RCC_MP_APB3ENSETR, 13, VREF, _PCLK3),
+
 	STM32MP1_CLK_SET_CLR(RCC_MP_APB4ENSETR, 8, DDRPERFM, _UNKNOWN_SEL),
 	STM32MP1_CLK_SET_CLR(RCC_MP_APB4ENSETR, 15, IWDG2, _UNKNOWN_SEL),
 	STM32MP1_CLK_SET_CLR(RCC_MP_APB4ENSETR, 16, USBPHY_K, _USBPHY_SEL),