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Message-ID: <20240124100019.290120-3-dharma.b@microchip.com>
Date: Wed, 24 Jan 2024 15:30:18 +0530
From: Dharma Balasubiramani <dharma.b@...rochip.com>
To: <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: Dharma Balasubiramani <dharma.b@...rochip.com>, Conor Dooley
<conor.dooley@...rochip.com>
Subject: [PATCH v4 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>
Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>
---
changelog
v3 -> v4
- No changes
Note: The clean up patch will be sent later as Sam suggested.
v2 -> v3
- Remove '|' in description, as there is no formatting to preserve.
- Delete the description for pwm-cells.
- Drop the label for pwm node as it not used.
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 | 44 +++++++++++++++++++
.../bindings/pwm/atmel-hlcdc-pwm.txt | 29 ------------
2 files changed, 44 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..4f4cc21fe4f7
--- /dev/null
+++ b/Documentation/devicetree/bindings/pwm/atmel,hlcdc-pwm.yaml
@@ -0,0 +1,44 @@
+# 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
+
+required:
+ - compatible
+ - "#pwm-cells"
+
+additionalProperties: false
+
+examples:
+ - |
+ 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
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