linux-kernel - [PATCH 1/2] drivers: pwm: pwm-atmel: add support for pwm on sama5d2

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Date:   Thu, 23 Feb 2017 10:38:39 +0200
From:   Claudiu Beznea <claudiu.beznea@...rochip.com>
To:     <thierry.reding@...il.com>, <robh+dt@...nel.org>,
        <pawel.moll@....com>, <mark.rutland@....com>,
        <ijc+devicetree@...lion.org.uk>, <galak@...eaurora.org>,
        <boris.brezillon@...e-electrons.com>,
        <alexandre.belloni@...e-electrons.com>
CC:     <linux-pwm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>
Subject: [PATCH 1/2] drivers: pwm: pwm-atmel: add support for pwm on sama5d2

Enable PWM on sama5d2 by adding atmel_pwm_config_v3().
This, simply, sets the period and duty factor registers.

Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
---
 Documentation/devicetree/bindings/pwm/atmel-pwm.txt |  1 +
 drivers/pwm/pwm-atmel.c                             | 16 ++++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/Documentation/devicetree/bindings/pwm/atmel-pwm.txt b/Documentation/devicetree/bindings/pwm/atmel-pwm.txt
index 02331b9..c8c831d 100644
--- a/Documentation/devicetree/bindings/pwm/atmel-pwm.txt
+++ b/Documentation/devicetree/bindings/pwm/atmel-pwm.txt
@@ -4,6 +4,7 @@ Required properties:
   - compatible: should be one of:
     - "atmel,at91sam9rl-pwm"
     - "atmel,sama5d3-pwm"
+    - "atmel,sama5d2-pwm"
   - reg: physical base address and length of the controller's registers
   - #pwm-cells: Should be 3. See pwm.txt in this directory for a
     description of the cells format.
diff --git a/drivers/pwm/pwm-atmel.c b/drivers/pwm/pwm-atmel.c
index 0e4bd4e..4406639 100644
--- a/drivers/pwm/pwm-atmel.c
+++ b/drivers/pwm/pwm-atmel.c
@@ -207,6 +207,15 @@ static void atmel_pwm_config_v2(struct pwm_chip *chip, struct pwm_device *pwm,
 	}
 }
 
+static void atmel_pwm_config_v3(struct pwm_chip *chip, struct pwm_device *pwm,
+				unsigned long dty, unsigned long prd)
+{
+	struct atmel_pwm_chip *atmel_pwm = to_atmel_pwm_chip(chip);
+
+	atmel_pwm_ch_writel(atmel_pwm, pwm->hwpwm, PWMV2_CDTY, dty);
+	atmel_pwm_ch_writel(atmel_pwm, pwm->hwpwm, PWMV2_CPRD, prd);
+}
+
 static int atmel_pwm_set_polarity(struct pwm_chip *chip, struct pwm_device *pwm,
 				  enum pwm_polarity polarity)
 {
@@ -295,6 +304,10 @@ static const struct atmel_pwm_data atmel_pwm_data_v2 = {
 	.config = atmel_pwm_config_v2,
 };
 
+static const struct atmel_pwm_data atmel_pwm_data_v3 = {
+	.config = atmel_pwm_config_v3,
+};
+
 static const struct platform_device_id atmel_pwm_devtypes[] = {
 	{
 		.name = "at91sam9rl-pwm",
@@ -316,6 +329,9 @@ static const struct of_device_id atmel_pwm_dt_ids[] = {
 		.compatible = "atmel,sama5d3-pwm",
 		.data = &atmel_pwm_data_v2,
 	}, {
+		.compatible = "atmel,sama5d2-pwm",
+		.data = &atmel_pwm_data_v3,
+	}, {
 		/* sentinel */
 	},
 };
-- 
2.7.4