ASoC: sta32x: add device tree binding.

make the sta32x driver usable with device tree configs.  Code is heavily based
on the sta350 driver.

Signed-off-by: Thomas Niederprüm <niederp@physik.uni-kl.de>
Signed-off-by: Mark Brown <broonie@kernel.org>

3 files changed, 211 insertions, 7 deletions

diff --git a/Documentation/devicetree/bindings/sound/st,sta32x.txt b/Documentation/devicetree/bindings/sound/st,sta32x.txt
new file mode 100644
index 000000000000..255de3ae5b2f
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/st,sta32x.txt
@@ -0,0 +1,92 @@
+STA32X audio CODEC
+
+The driver for this device only supports I2C.
+
+Required properties:
+
+  - compatible: "st,sta32x"
+  - reg: the I2C address of the device for I2C
+  - reset-gpios: a GPIO spec for the reset pin. If specified, it will be
+                 deasserted before communication to the codec starts.
+
+  - power-down-gpios: a GPIO spec for the power down pin. If specified,
+                      it will be deasserted before communication to the codec
+                      starts.
+
+  - Vdda-supply: regulator spec, providing 3.3V
+  - Vdd3-supply: regulator spec, providing 3.3V
+  - Vcc-supply: regulator spec, providing 5V - 26V
+
+Optional properties:
+
+  -  st,output-conf: number, Selects the output configuration:
+        0: 2-channel (full-bridge) power, 2-channel data-out
+        1: 2 (half-bridge). 1 (full-bridge) on-board power
+        2: 2 Channel (Full-Bridge) Power, 1 Channel FFX
+        3: 1 Channel Mono-Parallel
+        If parameter is missing, mode 0 will be enabled.
+        This property has to be specified as '/bits/ 8' value.
+
+  -  st,ch1-output-mapping: Channel 1 output mapping
+  -  st,ch2-output-mapping: Channel 2 output mapping
+  -  st,ch3-output-mapping: Channel 3 output mapping
+        0: Channel 1
+        1: Channel 2
+        2: Channel 3
+        If parameter is missing, channel 1 is chosen.
+        This properties have to be specified as '/bits/ 8' values.
+
+  -  st,thermal-warning-recover:
+        If present, thermal warning recovery is enabled.
+
+  -  st,thermal-warning-adjustment:
+        If present, thermal warning adjustment is enabled.
+
+  -  st,fault-detect-recovery:
+        If present, then fault recovery will be enabled.
+
+  -  st,drop-compensation-ns: number
+        Only required for "st,ffx-power-output-mode" ==
+        "variable-drop-compensation".
+        Specifies the drop compensation in nanoseconds.
+        The value must be in the range of 0..300, and only
+        multiples of 20 are allowed. Default is 140ns.
+
+  -  st,max-power-use-mpcc:
+        If present, then MPCC bits are used for MPC coefficients,
+        otherwise standard MPC coefficients are used.
+
+  -  st,max-power-corr:
+        If present, power bridge correction for THD reduction near maximum
+        power output is enabled.
+
+  -  st,am-reduction-mode:
+        If present, FFX mode runs in AM reduction mode, otherwise normal
+        FFX mode is used.
+
+  -  st,odd-pwm-speed-mode:
+        If present, PWM speed mode run on odd speed mode (341.3 kHz) on all
+        channels. If not present, normal PWM spped mode (384 kHz) will be used.
+
+  -  st,invalid-input-detect-mute:
+        If present, automatic invalid input detect mute is enabled.
+
+Example:
+
+codec: sta32x@38 {
+        compatible = "st,sta32x";
+        reg = <0x1c>;
+        reset-gpios = <&gpio1 19 0>;
+        power-down-gpios = <&gpio1 16 0>;
+        st,output-conf = /bits/ 8  <0x3>;       // set output to 2-channel
+                                                // (full-bridge) power,
+                                                // 2-channel data-out
+        st,ch1-output-mapping = /bits/ 8 <0>;   // set channel 1 output ch 1
+        st,ch2-output-mapping = /bits/ 8 <0>;   // set channel 2 output ch 1
+        st,ch3-output-mapping = /bits/ 8 <0>;   // set channel 3 output ch 1
+        st,max-power-correction;                // enables power bridge
+                                                // correction for THD reduction
+                                                // near maximum power output
+        st,invalid-input-detect-mute;           // mute if no valid digital
+                                                // audio signal is provided.
+};
diff --git a/include/sound/sta32x.h b/include/sound/sta32x.h
index 8d93b0357a14..a894f7d17b1a 100644
--- a/include/sound/sta32x.h
+++ b/include/sound/sta32x.h
@@ -24,12 +24,20 @@
 #define STA32X_THERMAL_RECOVERY_ENABLE          2
 
 struct sta32x_platform_data {
-        int output_conf;
-        int ch1_output_mapping;
-        int ch2_output_mapping;
-        int ch3_output_mapping;
-        int thermal_conf;
+        u8 output_conf;
+        u8 ch1_output_mapping;
+        u8 ch2_output_mapping;
+        u8 ch3_output_mapping;
         int needs_esd_watchdog;
+        u8 drop_compensation_ns;
+        unsigned int thermal_warning_recovery:1;
+        unsigned int thermal_warning_adjustment:1;
+        unsigned int fault_detect_recovery:1;
+        unsigned int max_power_use_mpcc:1;
+        unsigned int max_power_correction:1;
+        unsigned int am_reduction_mode:1;
+        unsigned int odd_pwm_speed_mode:1;
+        unsigned int invalid_input_detect_mute:1;
 };
 
 #endif /* __LINUX_SND__STA32X_H */
diff --git a/sound/soc/codecs/sta32x.c b/sound/soc/codecs/sta32x.c
index ec2372498c92..669b67f8cee3 100644
--- a/sound/soc/codecs/sta32x.c
+++ b/sound/soc/codecs/sta32x.c
@@ -24,6 +24,8 @@
 #include <linux/delay.h>
 #include <linux/pm.h>
 #include <linux/i2c.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
 #include <linux/regmap.h>
 #include <linux/regulator/consumer.h>
 #include <linux/gpio/consumer.h>
@@ -893,15 +895,49 @@ static int sta32x_probe(struct snd_soc_codec *codec)
                 dev_err(codec->dev, "Failed to startup device\n");
                 return ret;
         }
-        /* set thermal warning adjustment and recovery */
+
+        /* CONFA */
         if (!pdata->thermal_warning_recovery)
                 thermal |= STA32X_CONFA_TWAB;
         if (!pdata->thermal_warning_adjustment)
                 thermal |= STA32X_CONFA_TWRB;
+        if (!pdata->fault_detect_recovery)
+                thermal |= STA32X_CONFA_FDRB;
         regmap_update_bits(sta32x->regmap, STA32X_CONFA,
-                           STA32X_CONFA_TWAB | STA32X_CONFA_TWRB,
+                           STA32X_CONFA_TWAB | STA32X_CONFA_TWRB |
+                           STA32X_CONFA_FDRB,
                            thermal);
 
+        /* CONFC */
+        regmap_update_bits(sta32x->regmap, STA32X_CONFC,
+                           STA32X_CONFC_CSZ_MASK,
+                           pdata->drop_compensation_ns
+                                << STA32X_CONFC_CSZ_SHIFT);
+
+        /* CONFE */
+        regmap_update_bits(sta32x->regmap, STA32X_CONFE,
+                           STA32X_CONFE_MPCV,
+                           pdata->max_power_use_mpcc ?
+                                STA32X_CONFE_MPCV : 0);
+        regmap_update_bits(sta32x->regmap, STA32X_CONFE,
+                           STA32X_CONFE_MPC,
+                           pdata->max_power_correction ?
+                                STA32X_CONFE_MPC : 0);
+        regmap_update_bits(sta32x->regmap, STA32X_CONFE,
+                           STA32X_CONFE_AME,
+                           pdata->am_reduction_mode ?
+                                STA32X_CONFE_AME : 0);
+        regmap_update_bits(sta32x->regmap, STA32X_CONFE,
+                           STA32X_CONFE_PWMS,
+                           pdata->odd_pwm_speed_mode ?
+                                STA32X_CONFE_PWMS : 0);
+
+        /*  CONFF */
+        regmap_update_bits(sta32x->regmap, STA32X_CONFF,
+                           STA32X_CONFF_IDE,
+                           pdata->invalid_input_detect_mute ?
+                                STA32X_CONFF_IDE : 0);
+
         /* select output configuration  */
         regmap_update_bits(sta32x->regmap, STA32X_CONFF,
                            STA32X_CONFF_OCFG_MASK,
@@ -977,7 +1013,66 @@ static const struct regmap_config sta32x_regmap = {
         .rd_table =             &sta32x_read_regs,
         .volatile_table =       &sta32x_volatile_regs,
 };
+
+#ifdef CONFIG_OF
+static const struct of_device_id st32x_dt_ids[] = {
+        { .compatible = "st,sta32x", },
+        { }
 };
+MODULE_DEVICE_TABLE(of, st32x_dt_ids);
+
+static int sta32x_probe_dt(struct device *dev, struct sta32x_priv *sta32x)
+{
+        struct device_node *np = dev->of_node;
+        struct sta32x_platform_data *pdata;
+        u16 tmp;
+
+        pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+        if (!pdata)
+                return -ENOMEM;
+
+        of_property_read_u8(np, "st,output-conf",
+                            &pdata->output_conf);
+        of_property_read_u8(np, "st,ch1-output-mapping",
+                            &pdata->ch1_output_mapping);
+        of_property_read_u8(np, "st,ch2-output-mapping",
+                            &pdata->ch2_output_mapping);
+        of_property_read_u8(np, "st,ch3-output-mapping",
+                            &pdata->ch3_output_mapping);
+
+        if (of_get_property(np, "st,thermal-warning-recovery", NULL))
+                pdata->thermal_warning_recovery = 1;
+        if (of_get_property(np, "st,thermal-warning-adjustment", NULL))
+                pdata->thermal_warning_adjustment = 1;
+        if (of_get_property(np, "st,needs_esd_watchdog", NULL))
+                pdata->needs_esd_watchdog = 1;
+
+        tmp = 140;
+        of_property_read_u16(np, "st,drop-compensation-ns", &tmp);
+        pdata->drop_compensation_ns = clamp_t(u16, tmp, 0, 300) / 20;
+
+        /* CONFE */
+        if (of_get_property(np, "st,max-power-use-mpcc", NULL))
+                pdata->max_power_use_mpcc = 1;
+
+        if (of_get_property(np, "st,max-power-correction", NULL))
+                pdata->max_power_correction = 1;
+
+        if (of_get_property(np, "st,am-reduction-mode", NULL))
+                pdata->am_reduction_mode = 1;
+
+        if (of_get_property(np, "st,odd-pwm-speed-mode", NULL))
+                pdata->odd_pwm_speed_mode = 1;
+
+        /* CONFF */
+        if (of_get_property(np, "st,invalid-input-detect-mute", NULL))
+                pdata->invalid_input_detect_mute = 1;
+
+        sta32x->pdata = pdata;
+
+        return 0;
+}
+#endif
 
 static int sta32x_i2c_probe(struct i2c_client *i2c,
                             const struct i2c_device_id *id)
@@ -994,6 +1089,14 @@ static int sta32x_i2c_probe(struct i2c_client *i2c,
         mutex_init(&sta32x->coeff_lock);
         sta32x->pdata = dev_get_platdata(dev);
 
+#ifdef CONFIG_OF
+        if (dev->of_node) {
+                ret = sta32x_probe_dt(dev, sta32x);
+                if (ret < 0)
+                        return ret;
+        }
+#endif
+
         /* GPIOs */
         sta32x->gpiod_nreset = devm_gpiod_get(dev, "reset");
         if (IS_ERR(sta32x->gpiod_nreset)) {
@@ -1051,6 +1154,7 @@ static struct i2c_driver sta32x_i2c_driver = {
         .driver = {
                 .name = "sta32x",
                 .owner = THIS_MODULE,
+                .of_match_table = of_match_ptr(st32x_dt_ids),
         },
         .probe =    sta32x_i2c_probe,
         .remove =   sta32x_i2c_remove,