| Message ID | 1612515104-838-4-git-send-email-alain.volmat@foss.st.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | i2c: stm32: filter binding support & debug info | expand |
Hello all Looks good to me Signed-off-by: Pierre-Yves MORDRET <pierre-yves.mordret@foss.st.com> Regards On 2/5/21 9:51 AM, Alain Volmat wrote: > 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: Alain Volmat <alain.volmat@foss.st.com> > --- > drivers/i2c/busses/i2c-stm32f7.c | 27 ++++++++++++++++----------- > 1 file changed, 16 insertions(+), 11 deletions(-) > > diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c > index 0c539fea2754..f77cd6512a86 100644 > --- a/drivers/i2c/busses/i2c-stm32f7.c > +++ b/drivers/i2c/busses/i2c-stm32f7.c > @@ -222,7 +222,6 @@ struct stm32f7_i2c_spec { > * @clock_src: I2C clock source frequency (Hz) > * @rise_time: Rise time (ns) > * @fall_time: Fall time (ns) > - * @dnf: Digital filter coefficient (0-16) > * @fmp_clr_offset: Fast Mode Plus clear register offset from set register > */ > struct stm32f7_i2c_setup { > @@ -230,7 +229,6 @@ struct stm32f7_i2c_setup { > u32 clock_src; > u32 rise_time; > u32 fall_time; > - u8 dnf; > u32 fmp_clr_offset; > }; > > @@ -310,6 +308,8 @@ struct stm32f7_i2c_msg { > * @smbus_mode: states that the controller is configured in SMBus mode > * @host_notify_client: SMBus host-notify client > * @analog_filter: boolean to indicate enabling of the analog filter > + * @dnf_dt: value of digital filter requested via dt > + * @dnf: value of digital filter to apply > */ > struct stm32f7_i2c_dev { > struct i2c_adapter adap; > @@ -339,6 +339,8 @@ struct stm32f7_i2c_dev { > bool smbus_mode; > struct i2c_client *host_notify_client; > bool analog_filter; > + u32 dnf_dt; > + u32 dnf; > }; > > /* > @@ -384,13 +386,11 @@ static struct stm32f7_i2c_spec stm32f7_i2c_specs[] = { > static const struct stm32f7_i2c_setup stm32f7_setup = { > .rise_time = STM32F7_I2C_RISE_TIME_DEFAULT, > .fall_time = STM32F7_I2C_FALL_TIME_DEFAULT, > - .dnf = STM32F7_I2C_DNF_DEFAULT, > }; > > static const struct stm32f7_i2c_setup stm32mp15_setup = { > .rise_time = STM32F7_I2C_RISE_TIME_DEFAULT, > .fall_time = STM32F7_I2C_FALL_TIME_DEFAULT, > - .dnf = STM32F7_I2C_DNF_DEFAULT, > .fmp_clr_offset = 0x40, > }; > > @@ -459,10 +459,11 @@ static int stm32f7_i2c_compute_timing(struct stm32f7_i2c_dev *i2c_dev, > return -EINVAL; > } > > - if (setup->dnf > STM32F7_I2C_DNF_MAX) { > + i2c_dev->dnf = DIV_ROUND_CLOSEST(i2c_dev->dnf_dt, i2cclk); > + if (i2c_dev->dnf > STM32F7_I2C_DNF_MAX) { > dev_err(i2c_dev->dev, > "DNF out of bound %d/%d\n", > - setup->dnf, STM32F7_I2C_DNF_MAX); > + i2c_dev->dnf * i2cclk, STM32F7_I2C_DNF_MAX * i2cclk); > return -EINVAL; > } > > @@ -473,13 +474,13 @@ static int stm32f7_i2c_compute_timing(struct stm32f7_i2c_dev *i2c_dev, > af_delay_max = > (i2c_dev->analog_filter ? > STM32F7_I2C_ANALOG_FILTER_DELAY_MAX : 0); > - dnf_delay = setup->dnf * i2cclk; > + dnf_delay = i2c_dev->dnf * i2cclk; > > sdadel_min = specs->hddat_min + setup->fall_time - > - af_delay_min - (setup->dnf + 3) * i2cclk; > + af_delay_min - (i2c_dev->dnf + 3) * i2cclk; > > sdadel_max = specs->vddat_max - setup->rise_time - > - af_delay_max - (setup->dnf + 4) * i2cclk; > + af_delay_max - (i2c_dev->dnf + 4) * i2cclk; > > scldel_min = setup->rise_time + specs->sudat_min; > > @@ -645,6 +646,7 @@ static int stm32f7_i2c_setup_timing(struct stm32f7_i2c_dev *i2c_dev, > setup->speed_freq = t->bus_freq_hz; > i2c_dev->setup.rise_time = t->scl_rise_ns; > i2c_dev->setup.fall_time = t->scl_fall_ns; > + i2c_dev->dnf_dt = t->digital_filter_width_ns; > setup->clock_src = clk_get_rate(i2c_dev->clk); > > if (!setup->clock_src) { > @@ -652,6 +654,9 @@ static int stm32f7_i2c_setup_timing(struct stm32f7_i2c_dev *i2c_dev, > return -EINVAL; > } > > + if (!of_property_read_bool(i2c_dev->dev->of_node, "i2c-digital-filter")) > + i2c_dev->dnf_dt = STM32F7_I2C_DNF_DEFAULT; > + > do { > ret = stm32f7_i2c_compute_timing(i2c_dev, setup, > &i2c_dev->timing); > @@ -681,7 +686,7 @@ static int stm32f7_i2c_setup_timing(struct stm32f7_i2c_dev *i2c_dev, > dev_dbg(i2c_dev->dev, "I2C Rise(%i) and Fall(%i) Time\n", > setup->rise_time, setup->fall_time); > dev_dbg(i2c_dev->dev, "I2C Analog Filter(%s), DNF(%i)\n", > - (i2c_dev->analog_filter ? "On" : "Off"), setup->dnf); > + (i2c_dev->analog_filter ? "On" : "Off"), i2c_dev->dnf); > > i2c_dev->bus_rate = setup->speed_freq; > > @@ -732,7 +737,7 @@ static void stm32f7_i2c_hw_config(struct stm32f7_i2c_dev *i2c_dev) > stm32f7_i2c_clr_bits(i2c_dev->base + STM32F7_I2C_CR1, > STM32F7_I2C_CR1_DNF_MASK); > stm32f7_i2c_set_bits(i2c_dev->base + STM32F7_I2C_CR1, > - STM32F7_I2C_CR1_DNF(i2c_dev->setup.dnf)); > + STM32F7_I2C_CR1_DNF(i2c_dev->dnf)); > > stm32f7_i2c_set_bits(i2c_dev->base + STM32F7_I2C_CR1, > STM32F7_I2C_CR1_PE); >
On Fri, Feb 05, 2021 at 09:51:42AM +0100, Alain Volmat wrote: > 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: Alain Volmat <alain.volmat@foss.st.com> Applied to for-next, thanks!
diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c index 0c539fea2754..f77cd6512a86 100644 --- a/drivers/i2c/busses/i2c-stm32f7.c +++ b/drivers/i2c/busses/i2c-stm32f7.c @@ -222,7 +222,6 @@ struct stm32f7_i2c_spec { * @clock_src: I2C clock source frequency (Hz) * @rise_time: Rise time (ns) * @fall_time: Fall time (ns) - * @dnf: Digital filter coefficient (0-16) * @fmp_clr_offset: Fast Mode Plus clear register offset from set register */ struct stm32f7_i2c_setup { @@ -230,7 +229,6 @@ struct stm32f7_i2c_setup { u32 clock_src; u32 rise_time; u32 fall_time; - u8 dnf; u32 fmp_clr_offset; }; @@ -310,6 +308,8 @@ struct stm32f7_i2c_msg { * @smbus_mode: states that the controller is configured in SMBus mode * @host_notify_client: SMBus host-notify client * @analog_filter: boolean to indicate enabling of the analog filter + * @dnf_dt: value of digital filter requested via dt + * @dnf: value of digital filter to apply */ struct stm32f7_i2c_dev { struct i2c_adapter adap; @@ -339,6 +339,8 @@ struct stm32f7_i2c_dev { bool smbus_mode; struct i2c_client *host_notify_client; bool analog_filter; + u32 dnf_dt; + u32 dnf; }; /* @@ -384,13 +386,11 @@ static struct stm32f7_i2c_spec stm32f7_i2c_specs[] = { static const struct stm32f7_i2c_setup stm32f7_setup = { .rise_time = STM32F7_I2C_RISE_TIME_DEFAULT, .fall_time = STM32F7_I2C_FALL_TIME_DEFAULT, - .dnf = STM32F7_I2C_DNF_DEFAULT, }; static const struct stm32f7_i2c_setup stm32mp15_setup = { .rise_time = STM32F7_I2C_RISE_TIME_DEFAULT, .fall_time = STM32F7_I2C_FALL_TIME_DEFAULT, - .dnf = STM32F7_I2C_DNF_DEFAULT, .fmp_clr_offset = 0x40, }; @@ -459,10 +459,11 @@ static int stm32f7_i2c_compute_timing(struct stm32f7_i2c_dev *i2c_dev, return -EINVAL; } - if (setup->dnf > STM32F7_I2C_DNF_MAX) { + i2c_dev->dnf = DIV_ROUND_CLOSEST(i2c_dev->dnf_dt, i2cclk); + if (i2c_dev->dnf > STM32F7_I2C_DNF_MAX) { dev_err(i2c_dev->dev, "DNF out of bound %d/%d\n", - setup->dnf, STM32F7_I2C_DNF_MAX); + i2c_dev->dnf * i2cclk, STM32F7_I2C_DNF_MAX * i2cclk); return -EINVAL; } @@ -473,13 +474,13 @@ static int stm32f7_i2c_compute_timing(struct stm32f7_i2c_dev *i2c_dev, af_delay_max = (i2c_dev->analog_filter ? STM32F7_I2C_ANALOG_FILTER_DELAY_MAX : 0); - dnf_delay = setup->dnf * i2cclk; + dnf_delay = i2c_dev->dnf * i2cclk; sdadel_min = specs->hddat_min + setup->fall_time - - af_delay_min - (setup->dnf + 3) * i2cclk; + af_delay_min - (i2c_dev->dnf + 3) * i2cclk; sdadel_max = specs->vddat_max - setup->rise_time - - af_delay_max - (setup->dnf + 4) * i2cclk; + af_delay_max - (i2c_dev->dnf + 4) * i2cclk; scldel_min = setup->rise_time + specs->sudat_min; @@ -645,6 +646,7 @@ static int stm32f7_i2c_setup_timing(struct stm32f7_i2c_dev *i2c_dev, setup->speed_freq = t->bus_freq_hz; i2c_dev->setup.rise_time = t->scl_rise_ns; i2c_dev->setup.fall_time = t->scl_fall_ns; + i2c_dev->dnf_dt = t->digital_filter_width_ns; setup->clock_src = clk_get_rate(i2c_dev->clk); if (!setup->clock_src) { @@ -652,6 +654,9 @@ static int stm32f7_i2c_setup_timing(struct stm32f7_i2c_dev *i2c_dev, return -EINVAL; } + if (!of_property_read_bool(i2c_dev->dev->of_node, "i2c-digital-filter")) + i2c_dev->dnf_dt = STM32F7_I2C_DNF_DEFAULT; + do { ret = stm32f7_i2c_compute_timing(i2c_dev, setup, &i2c_dev->timing); @@ -681,7 +686,7 @@ static int stm32f7_i2c_setup_timing(struct stm32f7_i2c_dev *i2c_dev, dev_dbg(i2c_dev->dev, "I2C Rise(%i) and Fall(%i) Time\n", setup->rise_time, setup->fall_time); dev_dbg(i2c_dev->dev, "I2C Analog Filter(%s), DNF(%i)\n", - (i2c_dev->analog_filter ? "On" : "Off"), setup->dnf); + (i2c_dev->analog_filter ? "On" : "Off"), i2c_dev->dnf); i2c_dev->bus_rate = setup->speed_freq; @@ -732,7 +737,7 @@ static void stm32f7_i2c_hw_config(struct stm32f7_i2c_dev *i2c_dev) stm32f7_i2c_clr_bits(i2c_dev->base + STM32F7_I2C_CR1, STM32F7_I2C_CR1_DNF_MASK); stm32f7_i2c_set_bits(i2c_dev->base + STM32F7_I2C_CR1, - STM32F7_I2C_CR1_DNF(i2c_dev->setup.dnf)); + STM32F7_I2C_CR1_DNF(i2c_dev->dnf)); stm32f7_i2c_set_bits(i2c_dev->base + STM32F7_I2C_CR1, STM32F7_I2C_CR1_PE);
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: Alain Volmat <alain.volmat@foss.st.com> --- drivers/i2c/busses/i2c-stm32f7.c | 27 ++++++++++++++++----------- 1 file changed, 16 insertions(+), 11 deletions(-)