pwm: meson: Add support for Amlogic S4 PWM

Add support for Amlogic S4 PWM.

Signed-off-by: Junyi Zhao <[email protected]>
Signed-off-by: Kelvin Zhang <[email protected]>
Reviewed-by: George Stark <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Uwe Kleine-König <[email protected]>

Author: Junyi Zhao

drivers/pwm/pwm-meson.c

@@ -460,6 +460,37 @@ static int meson_pwm_init_channels_meson8b_v2(struct pwm_chip *chip)
 	return meson_pwm_init_clocks_meson8b(chip, mux_parent_data);
 }
 
+static void meson_pwm_s4_put_clk(void *data)
+{
+	struct clk *clk = data;
+
+	clk_put(clk);
+}
+
+static int meson_pwm_init_channels_s4(struct pwm_chip *chip)
+{
+	struct device *dev = pwmchip_parent(chip);
+	struct device_node *np = dev->of_node;
+	struct meson_pwm *meson = to_meson_pwm(chip);
+	int i, ret;
+
+	for (i = 0; i < MESON_NUM_PWMS; i++) {
+		meson->channels[i].clk = of_clk_get(np, i);
+		if (IS_ERR(meson->channels[i].clk))
+			return dev_err_probe(dev,
+					     PTR_ERR(meson->channels[i].clk),
+					     "Failed to get clk\n");
+
+		ret = devm_add_action_or_reset(dev, meson_pwm_s4_put_clk,
+					       meson->channels[i].clk);
+		if (ret)
+			return dev_err_probe(dev, ret,
+					     "Failed to add clk_put action\n");
+	}
+
+	return 0;
+}
+
 static const struct meson_pwm_data pwm_meson8b_data = {
 	.parent_names = { "xtal", NULL, "fclk_div4", "fclk_div3" },
 	.channels_init = meson_pwm_init_channels_meson8b_legacy,
@@ -498,6 +529,10 @@ static const struct meson_pwm_data pwm_meson8_v2_data = {
 	.channels_init = meson_pwm_init_channels_meson8b_v2,
 };
 
+static const struct meson_pwm_data pwm_s4_data = {
+	.channels_init = meson_pwm_init_channels_s4,
+};
+
 static const struct of_device_id meson_pwm_matches[] = {
 	{
 		.compatible = "amlogic,meson8-pwm-v2",
@@ -536,6 +571,10 @@ static const struct of_device_id meson_pwm_matches[] = {
 		.compatible = "amlogic,meson-g12a-ao-pwm-cd",
 		.data = &pwm_g12a_ao_cd_data
 	},
+	{
+		.compatible = "amlogic,meson-s4-pwm",
+		.data = &pwm_s4_data
+	},
 	{},
 };
 MODULE_DEVICE_TABLE(of, meson_pwm_matches);