i2c: stm32f7: support DT binding i2c-analog-filter

Replace driver internally coded enabling/disabling of the
analog-filter with the DT binding "i2c-analog-filter".
Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>
Reviewed-by: Pierre-Yves MORDRET <pierre-yves.mordret@foss.st.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

drivers/i2c/busses/i2c-stm32f7.c

@@ -164,7 +164,6 @@ enum {
 #define STM32F7_I2C_DNF_DEFAULT			0
 #define STM32F7_I2C_DNF_MAX			15
 
-#define STM32F7_I2C_ANALOG_FILTER_ENABLE	1
 #define STM32F7_I2C_ANALOG_FILTER_DELAY_MIN	50	/* ns */
 #define STM32F7_I2C_ANALOG_FILTER_DELAY_MAX	260	/* ns */
 
@@ -224,7 +223,6 @@ struct stm32f7_i2c_spec {
  * @rise_time: Rise time (ns)
  * @fall_time: Fall time (ns)
  * @dnf: Digital filter coefficient (0-16)
- * @analog_filter: Analog filter delay (On/Off)
  * @fmp_clr_offset: Fast Mode Plus clear register offset from set register
  */
 struct stm32f7_i2c_setup {
@@ -233,7 +231,6 @@ struct stm32f7_i2c_setup {
 	u32 rise_time;
 	u32 fall_time;
 	u8 dnf;
-	bool analog_filter;
 	u32 fmp_clr_offset;
 };
 
@@ -312,6 +309,7 @@ struct stm32f7_i2c_msg {
  * @wakeup_src: boolean to know if the device is a wakeup source
  * @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
  */
 struct stm32f7_i2c_dev {
 	struct i2c_adapter adap;
@@ -340,6 +338,7 @@ struct stm32f7_i2c_dev {
 	bool wakeup_src;
 	bool smbus_mode;
 	struct i2c_client *host_notify_client;
+	bool analog_filter;
 };
 
 /*
@@ -386,14 +385,12 @@ 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,
-	.analog_filter = STM32F7_I2C_ANALOG_FILTER_ENABLE,
 };
 
 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,
-	.analog_filter = STM32F7_I2C_ANALOG_FILTER_ENABLE,
 	.fmp_clr_offset = 0x40,
 };
 
@@ -471,10 +468,10 @@ static int stm32f7_i2c_compute_timing(struct stm32f7_i2c_dev *i2c_dev,
 
 	/*  Analog and Digital Filters */
 	af_delay_min =
-		(setup->analog_filter ?
+		(i2c_dev->analog_filter ?
 		 STM32F7_I2C_ANALOG_FILTER_DELAY_MIN : 0);
 	af_delay_max =
-		(setup->analog_filter ?
+		(i2c_dev->analog_filter ?
 		 STM32F7_I2C_ANALOG_FILTER_DELAY_MAX : 0);
 	dnf_delay = setup->dnf * i2cclk;
 
@@ -676,12 +673,15 @@ static int stm32f7_i2c_setup_timing(struct stm32f7_i2c_dev *i2c_dev,
 		return ret;
 	}
 
+	i2c_dev->analog_filter = of_property_read_bool(i2c_dev->dev->of_node,
+						       "i2c-analog-filter");
+
 	dev_dbg(i2c_dev->dev, "I2C Speed(%i), Clk Source(%i)\n",
 		setup->speed_freq, setup->clock_src);
 	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",
-		(setup->analog_filter ? "On" : "Off"), setup->dnf);
+		(i2c_dev->analog_filter ? "On" : "Off"), setup->dnf);
 
 	i2c_dev->bus_rate = setup->speed_freq;
 
@@ -720,8 +720,8 @@ static void stm32f7_i2c_hw_config(struct stm32f7_i2c_dev *i2c_dev)
 	timing |= STM32F7_I2C_TIMINGR_SCLL(t->scll);
 	writel_relaxed(timing, i2c_dev->base + STM32F7_I2C_TIMINGR);
 
-	/* Enable I2C */
-	if (i2c_dev->setup.analog_filter)
+	/* Configure the Analog Filter */
+	if (i2c_dev->analog_filter)
 		stm32f7_i2c_clr_bits(i2c_dev->base + STM32F7_I2C_CR1,
 				     STM32F7_I2C_CR1_ANFOFF);
 	else