[PATCH v4 1/2] pwm: meson: Add support for Amlogic S4 PWM

[Kelvin Zhang via B4 Relay]

From: Junyi Zhao <junyi.zhao at amlogic.com>

This patch adds support for Amlogic S4 PWM.

Signed-off-by: Junyi Zhao <junyi.zhao at amlogic.com>
Signed-off-by: Kelvin Zhang <kelvin.zhang at amlogic.com>
---
 drivers/pwm/pwm-meson.c | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c
index ea96c5973488..6abc823745e4 100644
--- a/drivers/pwm/pwm-meson.c
+++ b/drivers/pwm/pwm-meson.c
@@ -462,6 +462,35 @@ static int meson_pwm_init_channels_meson8b_v2(struct pwm_chip *chip)
 	return meson_pwm_init_clocks_meson8b(chip, mux_parent_data);
 }
 
+static int meson_pwm_init_channels_meson_s4(struct pwm_chip *chip)
+{
+	int i, ret;
+	struct device *dev = pwmchip_parent(chip);
+	struct device_node *np = dev->of_node;
+	struct meson_pwm *meson = to_meson_pwm(chip);
+	struct meson_pwm_channel *channel;
+
+	for (i = 0; i < MESON_NUM_PWMS; i++) {
+		channel = &meson->channels[i];
+		channel->clk = of_clk_get(np, i);
+		if (IS_ERR(channel->clk)) {
+			ret = PTR_ERR(channel->clk);
+			dev_err_probe(dev, ret, "Failed to get clk\n");
+			goto err;
+		}
+	}
+
+	return 0;
+
+err:
+	while (--i >= 0) {
+		channel = &meson->channels[i];
+		clk_put(channel->clk);
+	}
+
+	return ret;
+}
+
 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,
@@ -500,6 +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_meson_s4_data = {
+	.channels_init = meson_pwm_init_channels_meson_s4,
+};
+
 static const struct of_device_id meson_pwm_matches[] = {
 	{
 		.compatible = "amlogic,meson8-pwm-v2",
@@ -538,6 +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_meson_s4_data
+	},
 	{},
 };
 MODULE_DEVICE_TABLE(of, meson_pwm_matches);

-- 
2.37.1