linux-kernel - [PATCH v6 1/2] pwm: meson: Add support for Amlogic S4 PWM

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Message-Id: <20240529-s4-pwm-v6-1-270f63049f20@amlogic.com>
Date: Wed, 29 May 2024 18:00:56 +0800
From: Kelvin Zhang via B4 Relay <devnull+kelvin.zhang.amlogic.com@...nel.org>
To: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>, 
 Neil Armstrong <neil.armstrong@...aro.org>, 
 Kevin Hilman <khilman@...libre.com>, Jerome Brunet <jbrunet@...libre.com>, 
 Martin Blumenstingl <martin.blumenstingl@...glemail.com>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: linux-pwm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 devicetree@...r.kernel.org, Kelvin Zhang <kelvin.zhang@...ogic.com>, 
 Junyi Zhao <junyi.zhao@...ogic.com>
Subject: [PATCH v6 1/2] pwm: meson: Add support for Amlogic S4 PWM

From: Junyi Zhao <junyi.zhao@...ogic.com>

Add support for Amlogic S4 PWM.

Signed-off-by: Junyi Zhao <junyi.zhao@...ogic.com>
Signed-off-by: Kelvin Zhang <kelvin.zhang@...ogic.com>
---
 drivers/pwm/pwm-meson.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c
index b2f97dfb01bb..a513ebbb5666 100644
--- a/drivers/pwm/pwm-meson.c
+++ b/drivers/pwm/pwm-meson.c
@@ -460,6 +460,47 @@ 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 meson_pwm *meson = (struct meson_pwm *)data;
+	int i;
+
+	for (i = 0; i < MESON_NUM_PWMS; i++)
+		clk_put(meson->channels[i].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);
+	struct meson_pwm_channel *channel;
+	int i, ret;
+
+	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;
+		}
+	}
+	ret = devm_add_action_or_reset(dev, meson_pwm_s4_put_clk, meson);
+	if (ret)
+		return ret;
+
+	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,
@@ -498,6 +539,10 @@ 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 +581,10 @@ 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);

-- 
2.37.1