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drivers: i2c_ll_stm32: STM32F0/3 set I2C clock source

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STM32F0/3 I2C's independent clock source supports only
HSI and SYSCLK, not APB1. We force I2C clock source to SYSCLK.

Signed-off-by: Yannis Damigos <giannis.damigos@gmail.com>
This commit is contained in:
Yannis Damigos 2017-10-12 22:08:29 +03:00 • committed by Kumar Gala
commit 1a85a80200
1 changed files with 41 additions and 2 deletions
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43
drivers/i2c/i2c_ll_stm32.c
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@ -23,12 +23,24 @@ static int i2c_stm32_runtime_configure(struct device *dev, u32_t config)
const struct i2c_stm32_config *cfg = DEV_CFG(dev);
struct i2c_stm32_data *data = DEV_DATA(dev);
I2C_TypeDef *i2c = cfg->i2c;
u32_t clock;
u32_t clock = 0;
data->dev_config = config;
#if defined(CONFIG_SOC_SERIES_STM32F3X) || defined(CONFIG_SOC_SERIES_STM32F0X)
LL_RCC_ClocksTypeDef rcc_clocks;
/*
* STM32F0/3 I2C's independent clock source supports only
* HSI and SYSCLK, not APB1. We force clock variable to
* SYSCLK frequency.
*/
LL_RCC_GetSystemClocksFreq(&rcc_clocks);
clock = rcc_clocks.SYSCLK_Frequency;
#else
clock_control_get_rate(device_get_binding(STM32_CLOCK_CONTROL_NAME),
(clock_control_subsys_t *) &cfg->pclken, &clock);
#endif /* CONFIG_SOC_SERIES_STM32F3X) || CONFIG_SOC_SERIES_STM32F0X */
data->dev_config = config;
LL_I2C_Disable(i2c);
LL_I2C_SetMode(i2c, LL_I2C_MODE_I2C);
@ -103,6 +115,33 @@ static int i2c_stm32_init(struct device *dev)
__ASSERT_NO_MSG(clock);
clock_control_on(clock, (clock_control_subsys_t *) &cfg->pclken);
#if defined(CONFIG_SOC_SERIES_STM32F3X) || defined(CONFIG_SOC_SERIES_STM32F0X)
/*
* STM32F0/3 I2C's independent clock source supports only
* HSI and SYSCLK, not APB1. We force I2C clock source to SYSCLK.
*/
switch ((u32_t)cfg->i2c) {
#ifdef CONFIG_I2C_1
case CONFIG_I2C_1_BASE_ADDRESS:
LL_RCC_SetI2CClockSource(LL_RCC_I2C1_CLKSOURCE_SYSCLK);
break;
#endif /* CONFIG_I2C_1 */
#ifdef CONFIG_I2C_2
case CONFIG_I2C_2_BASE_ADDRESS:
LL_RCC_SetI2CClockSource(LL_RCC_I2C2_CLKSOURCE_SYSCLK);
break;
#endif /* CONFIG_I2C_2 */
#ifdef CONFIG_I2C_3
case CONFIG_I2C_3_BASE_ADDRESS:
LL_RCC_SetI2CClockSource(LL_RCC_I2C3_CLKSOURCE_SYSCLK);
break;
#endif /* CONFIG_I2C_3 */
}
#endif /* CONFIG_SOC_SERIES_STM32F3X) || CONFIG_SOC_SERIES_STM32F0X */
bitrate_cfg = _i2c_map_dt_bitrate(cfg->bitrate);
ret = i2c_stm32_runtime_configure(dev, I2C_MODE_MASTER | bitrate_cfg);