Add a driver for GPIO backlights. It understands the standard device tree binding. It can be used with simple-panel when PWM is not necessary. Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>master
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/*
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* Copyright (C) 2017, STMicroelectronics - All Rights Reserved |
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* Author: Patrick Delaunay <patrick.delaunay@st.com> |
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* |
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* SPDX-License-Identifier: GPL-2.0+ |
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*/ |
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#include <common.h> |
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#include <dm.h> |
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#include <backlight.h> |
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#include <asm/gpio.h> |
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DECLARE_GLOBAL_DATA_PTR; |
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struct gpio_backlight_priv { |
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struct gpio_desc gpio; |
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bool def_value; |
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}; |
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static int gpio_backlight_enable(struct udevice *dev) |
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{ |
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struct gpio_backlight_priv *priv = dev_get_priv(dev); |
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dm_gpio_set_value(&priv->gpio, 1); |
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return 0; |
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} |
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static int gpio_backlight_ofdata_to_platdata(struct udevice *dev) |
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{ |
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struct gpio_backlight_priv *priv = dev_get_priv(dev); |
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int ret; |
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ret = gpio_request_by_name(dev, "gpios", 0, &priv->gpio, |
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GPIOD_IS_OUT); |
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if (ret) { |
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debug("%s: Warning: cannot get GPIO: ret=%d\n", |
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__func__, ret); |
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return ret; |
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} |
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priv->def_value = dev_read_bool(dev, "default-on"); |
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return 0; |
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} |
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static int gpio_backlight_probe(struct udevice *dev) |
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{ |
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struct gpio_backlight_priv *priv = dev_get_priv(dev); |
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if (priv->def_value) |
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gpio_backlight_enable(dev); |
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return 0; |
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} |
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static const struct backlight_ops gpio_backlight_ops = { |
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.enable = gpio_backlight_enable, |
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}; |
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static const struct udevice_id gpio_backlight_ids[] = { |
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{ .compatible = "gpio-backlight" }, |
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{ } |
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}; |
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U_BOOT_DRIVER(gpio_backlight) = { |
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.name = "gpio_backlight", |
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.id = UCLASS_PANEL_BACKLIGHT, |
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.of_match = gpio_backlight_ids, |
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.ops = &gpio_backlight_ops, |
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.ofdata_to_platdata = gpio_backlight_ofdata_to_platdata, |
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.probe = gpio_backlight_probe, |
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.priv_auto_alloc_size = sizeof(struct gpio_backlight_priv), |
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}; |
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