boards/stm32: adapt I2C configuration where needed

boards/b-l475e-iot01a/include/periph_conf.h

@@ -179,6 +179,7 @@ static const i2c_conf_t i2c_config[] = {
         .sda_af         = GPIO_AF4,
         .bus            = APB1,
         .rcc_mask       = RCC_APB1ENR1_I2C1EN,
+        .rcc_sw_mask    = RCC_CCIPR_I2C1SEL_1,          /* HSI (16 MHz) */
         .irqn           = I2C1_ER_IRQn,
     },
     {
@@ -190,6 +191,7 @@ static const i2c_conf_t i2c_config[] = {
         .sda_af         = GPIO_AF4,
         .bus            = APB1,
         .rcc_mask       = RCC_APB1ENR1_I2C2EN,
+        .rcc_sw_mask    = RCC_CCIPR_I2C2SEL_1,          /* HSI (16 MHz) */
         .irqn           = I2C2_ER_IRQn,
     },
 };

boards/b-u585i-iot02a/include/periph_conf.h

@@ -158,6 +158,7 @@ static const i2c_conf_t i2c_config[] = {
         .sda_af         = GPIO_AF4,
         .bus            = APB1,
         .rcc_mask       = RCC_APB1ENR1_I2C1EN,
+        .rcc_sw_mask    = RCC_CCIPR1_I2C1SEL_1,
         .irqn           = I2C1_ER_IRQn,
     },
     {
@@ -169,6 +170,7 @@ static const i2c_conf_t i2c_config[] = {
         .sda_af         = GPIO_AF4,
         .bus            = APB1,
         .rcc_mask       = RCC_APB1ENR1_I2C2EN,
+        .rcc_sw_mask    = RCC_CCIPR1_I2C2SEL_1,
         .irqn           = I2C2_ER_IRQn,
     },
 };

boards/common/stm32/include/cfg_i2c1_pb6_pb7.h

@@ -45,6 +45,7 @@ static const i2c_conf_t i2c_config[] = {
         .bus            = APB1,
 #if CPU_FAM_STM32L4
         .rcc_mask       = RCC_APB1ENR1_I2C1EN,
+        .rcc_sw_mask    = RCC_CCIPR_I2C1SEL_1,          /* HSI (16 MHz) */
         .irqn           = I2C1_ER_IRQn,
 #else /* CPU_FAM_STM32L0 */
         .rcc_mask       = RCC_APB1ENR_I2C1EN,

boards/common/stm32/include/cfg_i2c1_pb8_pb9.h

@@ -50,14 +50,21 @@ static const i2c_conf_t i2c_config[] = {
         .rcc_mask       = RCC_APB1ENR_I2C1EN,
         .clk            = CLOCK_APB1,
         .irqn           = I2C1_EV_IRQn,
-#elif CPU_FAM_STM32L4 || CPU_FAM_STM32WB || CPU_FAM_STM32G4 || CPU_FAM_STM32L5
+#elif CPU_FAM_STM32L4 || CPU_FAM_STM32WB || CPU_FAM_STM32G4
         .rcc_mask       = RCC_APB1ENR1_I2C1EN,
+        .rcc_sw_mask    = RCC_CCIPR_I2C1SEL_1,          /* HSI (16 MHz) */
+        .irqn           = I2C1_ER_IRQn,
+#elif CPU_FAM_STM32L5
+        .rcc_mask       = RCC_APB1ENR1_I2C1EN,
+        .rcc_sw_mask    = RCC_CCIPR1_I2C1SEL_1,         /* HSI (16 MHz) */
         .irqn           = I2C1_ER_IRQn,
 #elif CPU_FAM_STM32G0
         .rcc_mask       = RCC_APBENR1_I2C1EN,
+        .rcc_sw_mask    = RCC_CCIPR_I2C1SEL_1,          /* HSI (16 MHz) */
         .irqn           = I2C1_IRQn,
 #elif CPU_FAM_STM32F7
         .rcc_mask       = RCC_APB1ENR_I2C1EN,
+        .rcc_sw_mask    = RCC_DCKCFGR2_I2C1SEL_1,       /* HSI (16 MHz) */
         .irqn           = I2C1_ER_IRQn,
 #elif CPU_FAM_STM32F0 || CPU_FAM_STM32L0
         .rcc_mask       = RCC_APB1ENR_I2C1EN,

boards/lora-e5-dev/include/periph_conf.h

@@ -143,6 +143,7 @@ static const i2c_conf_t i2c_config[] = {
         .sda_af         = GPIO_AF4,
         .bus            = APB1,
         .rcc_mask       = RCC_APB1ENR1_I2C2EN,
+        .rcc_sw_mask    = RCC_CCIPR_I2C2SEL_1,      /* HSI (16 MHz) */
         .irqn           = I2C2_ER_IRQn,
     }
 };

boards/nucleo-l433rc/include/periph_conf.h

@@ -131,6 +131,7 @@ static const i2c_conf_t i2c_config[] = {
         .sda_af         = GPIO_AF4,
         .bus            = APB1,
         .rcc_mask       = RCC_APB1ENR1_I2C1EN,
+        .rcc_sw_mask    = RCC_CCIPR_I2C2SEL_1,  /* HSI (16 MHz) */
         .irqn           = I2C1_ER_IRQn
     },
 };

boards/nucleo-wl55jc/include/periph_conf.h

@@ -132,6 +132,7 @@ static const i2c_conf_t i2c_config[] = {
         .sda_af         = GPIO_AF4,
         .bus            = APB1,
         .rcc_mask       = RCC_APB1ENR1_I2C2EN,
+        .rcc_sw_mask    = RCC_CCIPR_I2C2SEL_1,  /* HSI (16 MHz) */
         .irqn           = I2C2_ER_IRQn,
     }
 };

boards/p-l496g-cell02/include/periph_conf.h

@@ -116,6 +116,7 @@ static const i2c_conf_t i2c_config[] = {
         .sda_af         = GPIO_AF4,
         .bus            = APB1,
         .rcc_mask       = RCC_APB1ENR1_I2C1EN,
+        .rcc_sw_mask    = RCC_CCIPR_I2C1SEL_1,      /* HSI (16 MHz) */
         .irqn           = I2C1_ER_IRQn
     },
 };

boards/stm32f723e-disco/include/periph_conf.h

@@ -154,6 +154,7 @@ static const i2c_conf_t i2c_config[] = {
         .sda_af         = GPIO_AF4,
         .bus            = APB1,
         .rcc_mask       = RCC_APB1ENR_I2C2EN,
+        .rcc_sw_mask    = RCC_DCKCFGR2_I2C2SEL_1,
         .irqn           = I2C2_ER_IRQn,
     },
     {   /* Connected to touchscreen controller */
@@ -165,6 +166,7 @@ static const i2c_conf_t i2c_config[] = {
         .sda_af         = GPIO_AF4,
         .bus            = APB1,
         .rcc_mask       = RCC_APB1ENR_I2C3EN,
+        .rcc_sw_mask    = RCC_DCKCFGR2_I2C3SEL_1,
         .irqn           = I2C3_ER_IRQn,
     },
     {
@@ -176,6 +178,7 @@ static const i2c_conf_t i2c_config[] = {
         .sda_af         = GPIO_AF4,
         .bus            = APB1,
         .rcc_mask       = RCC_APB1ENR_I2C1EN,
+        .rcc_sw_mask    = RCC_DCKCFGR2_I2C1SEL_1,
         .irqn           = I2C1_ER_IRQn,
     },
 };

boards/stm32f746g-disco/include/periph_conf.h

@@ -160,6 +160,7 @@ static const i2c_conf_t i2c_config[] = {
         .sda_af         = GPIO_AF4,
         .bus            = APB1,
         .rcc_mask       = RCC_APB1ENR_I2C1EN,
+        .rcc_sw_mask    = RCC_DCKCFGR2_I2C1SEL_1,
         .irqn           = I2C1_ER_IRQn,
     },
     {
@@ -171,6 +172,7 @@ static const i2c_conf_t i2c_config[] = {
         .sda_af         = GPIO_AF4,
         .bus            = APB1,
         .rcc_mask       = RCC_APB1ENR_I2C3EN,
+        .rcc_sw_mask    = RCC_DCKCFGR2_I2C3SEL_1,
         .irqn           = I2C3_ER_IRQn,
     },
 };