linux-kernel - [PATCH v2 2/3] dt-bindings: atmel,hlcdc: convert pwm bindings to json-schema

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Date: Tue, 16 Jan 2024 17:07:59 +0530
From: Dharma Balasubiramani <dharma.b@...rochip.com>
To: <conor.dooley@...rochip.com>, <sam@...nborg.org>, <bbrezillon@...nel.org>,
	<maarten.lankhorst@...ux.intel.com>, <mripard@...nel.org>,
	<tzimmermann@...e.de>, <airlied@...il.com>, <daniel@...ll.ch>,
	<robh+dt@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
	<conor+dt@...nel.org>, <nicolas.ferre@...rochip.com>,
	<alexandre.belloni@...tlin.com>, <claudiu.beznea@...on.dev>,
	<dri-devel@...ts.freedesktop.org>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
	<lee@...nel.org>, <thierry.reding@...il.com>,
	<u.kleine-koenig@...gutronix.de>, <linux-pwm@...r.kernel.org>
CC: <linux4microchip@...rochip.com>, Dharma Balasubiramani
	<dharma.b@...rochip.com>
Subject: [PATCH v2 2/3] dt-bindings: atmel,hlcdc: convert pwm bindings to json-schema

Convert device tree bindings for Atmel's HLCDC PWM controller to YAML
format.

Signed-off-by: Dharma Balasubiramani <dharma.b@...rochip.com>
---
changelog
v1 -> v2
- Remove the explicit copyrights.
- Modify title (not include words like binding/driver).
- Modify description actually describing the hardware and not the driver.
- Remove pinctrl properties which aren't required.
- Drop parent node and it's other sub-device node which are not related here.
---
 .../bindings/pwm/atmel,hlcdc-pwm.yaml         | 47 +++++++++++++++++++
 .../bindings/pwm/atmel-hlcdc-pwm.txt          | 29 ------------
 2 files changed, 47 insertions(+), 29 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/pwm/atmel,hlcdc-pwm.yaml
 delete mode 100644 Documentation/devicetree/bindings/pwm/atmel-hlcdc-pwm.txt

diff --git a/Documentation/devicetree/bindings/pwm/atmel,hlcdc-pwm.yaml b/Documentation/devicetree/bindings/pwm/atmel,hlcdc-pwm.yaml
new file mode 100644
index 000000000000..751122309fa9
--- /dev/null
+++ b/Documentation/devicetree/bindings/pwm/atmel,hlcdc-pwm.yaml
@@ -0,0 +1,47 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pwm/atmel,hlcdc-pwm.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Atmel's HLCDC's PWM controller
+
+maintainers:
+  - Nicolas Ferre <nicolas.ferre@...rochip.com>
+  - Alexandre Belloni <alexandre.belloni@...tlin.com>
+  - Claudiu Beznea <claudiu.beznea@...on.dev>
+
+description: |
+  The LCDC integrates a Pulse Width Modulation (PWM) Controller. This block
+  generates the LCD contrast control signal (LCD_PWM) that controls the
+  display's contrast by software. LCDC_PWM is an 8-bit PWM signal that can be
+  converted to an analog voltage with a simple passive filter. LCD display
+  panels have different backlight specifications in terms of minimum/maximum
+  values for PWM frequency. If the LCDC PWM frequency range does not match the
+  LCD display panel, it is possible to use the standalone PWM Controller to
+  drive the backlight.
+
+properties:
+  compatible:
+    const: atmel,hlcdc-pwm
+
+  "#pwm-cells":
+    const: 3
+    description: |
+      This PWM chip uses the default 3 cells bindings defined in pwm.yaml in
+      this directory.
+
+required:
+  - compatible
+  - "#pwm-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    pwm: pwm {
+      compatible = "atmel,hlcdc-pwm";
+      pinctrl-names = "default";
+      pinctrl-0 = <&pinctrl_lcd_pwm>;
+      #pwm-cells = <3>;
+    };
diff --git a/Documentation/devicetree/bindings/pwm/atmel-hlcdc-pwm.txt b/Documentation/devicetree/bindings/pwm/atmel-hlcdc-pwm.txt
deleted file mode 100644
index afa501bf7f94..000000000000
--- a/Documentation/devicetree/bindings/pwm/atmel-hlcdc-pwm.txt
+++ /dev/null
@@ -1,29 +0,0 @@
-Device-Tree bindings for Atmel's HLCDC (High-end LCD Controller) PWM driver
-
-The Atmel HLCDC PWM is subdevice of the HLCDC MFD device.
-See ../mfd/atmel-hlcdc.txt for more details.
-
-Required properties:
- - compatible: value should be one of the following:
-   "atmel,hlcdc-pwm"
- - pinctr-names: the pin control state names. Should contain "default".
- - pinctrl-0: should contain the pinctrl states described by pinctrl
-   default.
- - #pwm-cells: should be set to 3. This PWM chip use the default 3 cells
-   bindings defined in pwm.yaml in this directory.
-
-Example:
-
-	hlcdc: hlcdc@...30000 {
-		compatible = "atmel,sama5d3-hlcdc";
-		reg = <0xf0030000 0x2000>;
-		clocks = <&lcdc_clk>, <&lcdck>, <&clk32k>;
-		clock-names = "periph_clk","sys_clk", "slow_clk";
-
-		hlcdc_pwm: hlcdc-pwm {
-			compatible = "atmel,hlcdc-pwm";
-			pinctrl-names = "default";
-			pinctrl-0 = <&pinctrl_lcd_pwm>;
-			#pwm-cells = <3>;
-		};
-	};
-- 
2.25.1