[PATCH 2/2] pwm: meson: Add support for Amlogic S7

From: Xianwei Zhao via B4 Relay <devnull+xianwei.zhao.amlogic.com@kernel.org>
To: "Uwe Kleine-König" <ukleinek@kernel.org>,
	"Rob Herring" <robh@kernel.org>,
	"Krzysztof Kozlowski" <krzk+dt@kernel.org>,
	"Conor Dooley" <conor+dt@kernel.org>,
	"Heiner Kallweit" <hkallweit1@gmail.com>,
	"Neil Armstrong" <neil.armstrong@linaro.org>,
	"Kevin Hilman" <khilman@baylibre.com>,
	"Jerome Brunet" <jbrunet@baylibre.com>,
	"Martin Blumenstingl" <martin.blumenstingl@googlemail.com>
Cc: linux-pwm@vger.kernel.org, devicetree@vger.kernel.org,
	 linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	 linux-amlogic@lists.infradead.org,
	Xianwei Zhao <xianwei.zhao@amlogic.com>
Subject: [PATCH 2/2] pwm: meson: Add support for Amlogic S7
Date: Thu, 26 Mar 2026 06:35:39 +0000	[thread overview]
Message-ID: <20260326-s6-s7-pwm-v1-2-67e2f72b98bc@amlogic.com> (raw)
In-Reply-To: <20260326-s6-s7-pwm-v1-0-67e2f72b98bc@amlogic.com>

From: Xianwei Zhao <xianwei.zhao@amlogic.com>

Add support for Amlogic S7 PWM. Amlogic S7 different from the
previous SoCs, a controller includes one pwm, at the same time,
the controller has only one input clock source.

Signed-off-by: Xianwei Zhao <xianwei.zhao@amlogic.com>
---
 drivers/pwm/pwm-meson.c | 32 ++++++++++++++++++++++++++++++--
 1 file changed, 30 insertions(+), 2 deletions(-)

diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c
index 8c6bf3d49753..3d16694e254e 100644
--- a/drivers/pwm/pwm-meson.c
+++ b/drivers/pwm/pwm-meson.c
@@ -113,6 +113,7 @@ struct meson_pwm_data {
 	int (*channels_init)(struct pwm_chip *chip);
 	bool has_constant;
 	bool has_polarity;
+	bool single_pwm;
 };
 
 struct meson_pwm {
@@ -503,6 +504,18 @@ static void meson_pwm_s4_put_clk(void *data)
 	clk_put(clk);
 }
 
+static int meson_pwm_init_channels_s7(struct pwm_chip *chip)
+{
+	struct device *dev = pwmchip_parent(chip);
+	struct meson_pwm *meson = to_meson_pwm(chip);
+
+	meson->channels[0].clk = devm_clk_get(dev, NULL);
+	if (IS_ERR(meson->channels[0].clk))
+		return dev_err_probe(dev, PTR_ERR(meson->channels[0].clk),
+				     "Failed to get clk\n");
+	return 0;
+}
+
 static int meson_pwm_init_channels_s4(struct pwm_chip *chip)
 {
 	struct device *dev = pwmchip_parent(chip);
@@ -592,6 +605,13 @@ static const struct meson_pwm_data pwm_s4_data = {
 	.has_polarity = true,
 };
 
+static const struct meson_pwm_data pwm_s7_data = {
+	.channels_init = meson_pwm_init_channels_s7,
+	.has_constant = true,
+	.has_polarity = true,
+	.single_pwm = true,
+};
+
 static const struct of_device_id meson_pwm_matches[] = {
 	{
 		.compatible = "amlogic,meson8-pwm-v2",
@@ -642,6 +662,10 @@ static const struct of_device_id meson_pwm_matches[] = {
 		.compatible = "amlogic,meson-s4-pwm",
 		.data = &pwm_s4_data
 	},
+	{
+		.compatible = "amlogic,s7-pwm",
+		.data = &pwm_s7_data
+	},
 	{},
 };
 MODULE_DEVICE_TABLE(of, meson_pwm_matches);
@@ -650,9 +674,13 @@ static int meson_pwm_probe(struct platform_device *pdev)
 {
 	struct pwm_chip *chip;
 	struct meson_pwm *meson;
+	const struct meson_pwm_data *pdata = of_device_get_match_data(&pdev->dev);
 	int err;
 
-	chip = devm_pwmchip_alloc(&pdev->dev, MESON_NUM_PWMS, sizeof(*meson));
+	if (pdata->single_pwm)
+		chip = devm_pwmchip_alloc(&pdev->dev, 1, sizeof(*meson));
+	else
+		chip = devm_pwmchip_alloc(&pdev->dev, MESON_NUM_PWMS, sizeof(*meson));
 	if (IS_ERR(chip))
 		return PTR_ERR(chip);
 	meson = to_meson_pwm(chip);
@@ -664,7 +692,7 @@ static int meson_pwm_probe(struct platform_device *pdev)
 	spin_lock_init(&meson->lock);
 	chip->ops = &meson_pwm_ops;
 
-	meson->data = of_device_get_match_data(&pdev->dev);
+	meson->data = pdata;
 
 	err = meson->data->channels_init(chip);
 	if (err < 0)

-- 
2.52.0



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