Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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@microchip.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240202001733.91455-3-dharma.b@microchip.com
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
authored by
Dharma Balasubiramani
and committed by
Uwe Kleine-König
0fa319a1
1706175c
+35
-29
+35
Documentation/devicetree/bindings/pwm/atmel,hlcdc-pwm.yaml
+35
Documentation/devicetree/bindings/pwm/atmel,hlcdc-pwm.yaml
···
1
+
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2
+
%YAML 1.2
3
+
---
4
+
$id: http://devicetree.org/schemas/pwm/atmel,hlcdc-pwm.yaml#
5
+
$schema: http://devicetree.org/meta-schemas/core.yaml#
6
+
7
+
title: Atmel's HLCDC's PWM controller
8
+
9
+
maintainers:
10
+
- Nicolas Ferre <nicolas.ferre@microchip.com>
11
+
- Alexandre Belloni <alexandre.belloni@bootlin.com>
12
+
- Claudiu Beznea <claudiu.beznea@tuxon.dev>
13
+
14
+
description:
15
+
The LCDC integrates a Pulse Width Modulation (PWM) Controller. This block
16
+
generates the LCD contrast control signal (LCD_PWM) that controls the
17
+
display's contrast by software. LCDC_PWM is an 8-bit PWM signal that can be
18
+
converted to an analog voltage with a simple passive filter. LCD display
19
+
panels have different backlight specifications in terms of minimum/maximum
20
+
values for PWM frequency. If the LCDC PWM frequency range does not match the
21
+
LCD display panel, it is possible to use the standalone PWM Controller to
22
+
drive the backlight.
23
+
24
+
properties:
25
+
compatible:
26
+
const: atmel,hlcdc-pwm
27
+
28
+
"#pwm-cells":
29
+
const: 3
30
+
31
+
required:
32
+
- compatible
33
+
- "#pwm-cells"
34
+
35
+
additionalProperties: false
-29
Documentation/devicetree/bindings/pwm/atmel-hlcdc-pwm.txt
-29
Documentation/devicetree/bindings/pwm/atmel-hlcdc-pwm.txt
···
1
-
Device-Tree bindings for Atmel's HLCDC (High-end LCD Controller) PWM driver
2
-
3
-
The Atmel HLCDC PWM is subdevice of the HLCDC MFD device.
4
-
See ../mfd/atmel-hlcdc.txt for more details.
5
-
6
-
Required properties:
7
-
- compatible: value should be one of the following:
8
-
"atmel,hlcdc-pwm"
9
-
- pinctr-names: the pin control state names. Should contain "default".
10
-
- pinctrl-0: should contain the pinctrl states described by pinctrl
11
-
default.
12
-
- #pwm-cells: should be set to 3. This PWM chip use the default 3 cells
13
-
bindings defined in pwm.yaml in this directory.
14
-
15
-
Example:
16
-
17
-
hlcdc: hlcdc@f0030000 {
18
-
compatible = "atmel,sama5d3-hlcdc";
19
-
reg = <0xf0030000 0x2000>;
20
-
clocks = <&lcdc_clk>, <&lcdck>, <&clk32k>;
21
-
clock-names = "periph_clk","sys_clk", "slow_clk";
22
-
23
-
hlcdc_pwm: hlcdc-pwm {
24
-
compatible = "atmel,hlcdc-pwm";
25
-
pinctrl-names = "default";
26
-
pinctrl-0 = <&pinctrl_lcd_pwm>;
27
-
#pwm-cells = <3>;
28
-
};
29
-
};