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i2c: stm32f7: add support for DNF i2c-digital-filter binding

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Add the support for the i2c-digital-filter binding, allowing to enable
the digital filter via the device-tree and indicate its value in the DT

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
This commit is contained in:
Patrick Delaunay 2021-08-03 12:05:14 +02:00 • committed by Patrice Chotard
parent 6bbb14f018
commit 6338b45888
1 changed files with 9 additions and 2 deletions
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11
drivers/i2c/stm32f7_i2c.c
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@ -107,7 +107,6 @@ struct stm32_i2c_regs {
#define STM32_I2C_MAX_LEN 0xff
#define STM32_I2C_DNF_DEFAULT 0
#define STM32_I2C_DNF_MAX 15
#define STM32_I2C_ANALOG_FILTER_DELAY_MIN 50 /* ns */
@ -204,6 +203,7 @@ struct stm32_i2c_timings {
* @regmap_sreg: register address for setting Fast Mode Plus bits
* @regmap_creg: register address for clearing Fast Mode Plus bits
* @regmap_mask: mask for Fast Mode Plus bits
* @dnf_dt: value of digital filter requested via dt
*/
struct stm32_i2c_priv {
struct stm32_i2c_regs *regs;
@ -214,6 +214,7 @@ struct stm32_i2c_priv {
u32 regmap_sreg;
u32 regmap_creg;
u32 regmap_mask;
u32 dnf_dt;
};
static const struct stm32_i2c_spec i2c_specs[] = {
@ -684,6 +685,7 @@ static int stm32_i2c_compute_timing(struct stm32_i2c_priv *i2c_priv,
const struct stm32_i2c_spec *specs;
struct stm32_i2c_timings *v, *_v;
struct list_head solutions;
u32 i2cclk = DIV_ROUND_CLOSEST(STM32_NSEC_PER_SEC, setup->clock_src);
int ret;
specs = get_specs(setup->speed_freq);
@ -701,6 +703,8 @@ static int stm32_i2c_compute_timing(struct stm32_i2c_priv *i2c_priv,
return -EINVAL;
}
/* Analog and Digital Filters */
setup->dnf = DIV_ROUND_CLOSEST(i2c_priv->dnf_dt, i2cclk);
if (setup->dnf > STM32_I2C_DNF_MAX) {
log_err("DNF out of bound %d/%d\n",
setup->dnf, STM32_I2C_DNF_MAX);
@ -923,7 +927,10 @@ static int stm32_of_to_plat(struct udevice *dev)
fall_time = dev_read_u32_default(dev, "i2c-scl-falling-time-ns",
STM32_I2C_FALL_TIME_DEFAULT);
i2c_priv->setup.dnf = STM32_I2C_DNF_DEFAULT;
i2c_priv->dnf_dt = dev_read_u32_default(dev, "i2c-digital-filter-width-ns", 0);
if (!dev_read_bool(dev, "i2c-digital-filter"))
i2c_priv->dnf_dt = 0;
i2c_priv->setup.analog_filter = dev_read_bool(dev, "i2c-analog-filter");
/* Optional */