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https://github.com/smaeul/u-boot.git
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3fe7ba6039
Now that the PMIC has a DM driver and binds device tree subnodes, the GPIO device can be bound that way, instead of from inside board code. Since the driver still uses the single set of register definitions from axpXXX.h (as selected by AXPxxx_POWER), it does not differentiate among the supported compatibles. Signed-off-by: Samuel Holland <samuel@sholland.org>
127 lines
2.6 KiB
C
127 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2015 Hans de Goede <hdegoede@redhat.com>
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*
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* X-Powers AXP Power Management ICs gpio driver
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*/
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#include <common.h>
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#include <asm/arch/pmic_bus.h>
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#include <asm/gpio.h>
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#include <axp_pmic.h>
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#include <dm.h>
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#include <errno.h>
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#define AXP_GPIO_PREFIX "AXP0-"
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#define AXP_GPIO_COUNT 4
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static int axp_gpio_set_value(struct udevice *dev, unsigned pin, int val);
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static u8 axp_get_gpio_ctrl_reg(unsigned pin)
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{
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switch (pin) {
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case 0: return AXP_GPIO0_CTRL;
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case 1: return AXP_GPIO1_CTRL;
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#ifdef AXP_GPIO2_CTRL
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case 2: return AXP_GPIO2_CTRL;
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#endif
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#ifdef AXP_GPIO3_CTRL
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case 3: return AXP_GPIO3_CTRL;
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#endif
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}
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return 0;
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}
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static int axp_gpio_direction_input(struct udevice *dev, unsigned pin)
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{
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u8 reg;
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reg = axp_get_gpio_ctrl_reg(pin);
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if (reg == 0)
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return -EINVAL;
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return pmic_bus_write(reg, AXP_GPIO_CTRL_INPUT);
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}
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static int axp_gpio_direction_output(struct udevice *dev, unsigned pin,
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int val)
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{
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u8 reg;
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reg = axp_get_gpio_ctrl_reg(pin);
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if (reg == 0)
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return -EINVAL;
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return pmic_bus_write(reg, val ? AXP_GPIO_CTRL_OUTPUT_HIGH :
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AXP_GPIO_CTRL_OUTPUT_LOW);
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}
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static int axp_gpio_get_value(struct udevice *dev, unsigned pin)
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{
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u8 reg, val, mask;
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int ret;
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reg = axp_get_gpio_ctrl_reg(pin);
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if (reg == 0)
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return -EINVAL;
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ret = pmic_bus_read(AXP_GPIO_STATE, &val);
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if (ret)
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return ret;
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mask = 1 << (pin + AXP_GPIO_STATE_OFFSET);
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return (val & mask) ? 1 : 0;
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}
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static int axp_gpio_set_value(struct udevice *dev, unsigned pin, int val)
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{
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u8 reg;
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reg = axp_get_gpio_ctrl_reg(pin);
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if (reg == 0)
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return -EINVAL;
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return pmic_bus_write(reg, val ? AXP_GPIO_CTRL_OUTPUT_HIGH :
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AXP_GPIO_CTRL_OUTPUT_LOW);
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}
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static const struct dm_gpio_ops axp_gpio_ops = {
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.direction_input = axp_gpio_direction_input,
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.direction_output = axp_gpio_direction_output,
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.get_value = axp_gpio_get_value,
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.set_value = axp_gpio_set_value,
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};
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static int axp_gpio_probe(struct udevice *dev)
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{
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struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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int ret;
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ret = pmic_bus_init();
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if (ret)
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return ret;
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/* Tell the uclass how many GPIOs we have */
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uc_priv->bank_name = AXP_GPIO_PREFIX;
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uc_priv->gpio_count = AXP_GPIO_COUNT;
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return 0;
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}
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static const struct udevice_id axp_gpio_ids[] = {
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{ .compatible = "x-powers,axp152-gpio" },
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{ .compatible = "x-powers,axp209-gpio" },
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{ .compatible = "x-powers,axp221-gpio" },
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{ .compatible = "x-powers,axp813-gpio" },
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{ }
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};
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U_BOOT_DRIVER(axp_gpio) = {
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.name = "axp_gpio",
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.id = UCLASS_GPIO,
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.of_match = axp_gpio_ids,
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.probe = axp_gpio_probe,
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.ops = &axp_gpio_ops,
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};
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