| Tom Rini | 6bb92fc | 2024-05-20 09:54:58 -0600 | [diff] [blame] | 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 |