[U-Boot,19/26] power: Add a GPIO driver for the as3722 PMIC

This pmic includes GPIOs which should have their own driver. Add
a driver to support these.

Signed-off-by: Simon Glass <sjg@chromium.org>
---

 drivers/power/pmic/as3722_gpio.c | 120 +++++++++++++++++++++++++++++++++++++++
 include/power/as3722.h           |   5 ++
 2 files changed, 125 insertions(+)
 create mode 100644 drivers/power/pmic/as3722_gpio.c

On Fri, 19 May 2017 08:31:02 -0600
Simon Glass <sjg@chromium.org> wrote:

> This pmic includes GPIOs which should have their own driver. Add
> a driver to support these.


Reviewed-by: Lukasz Majewski <lukma@denx.de>


> 
> Signed-off-by: Simon Glass <sjg@chromium.org>
> ---
> 
>  drivers/power/pmic/as3722_gpio.c | 120
> +++++++++++++++++++++++++++++++++++++++
> include/power/as3722.h           |   5 ++ 2 files changed, 125
> insertions(+) create mode 100644 drivers/power/pmic/as3722_gpio.c
> 
> diff --git a/drivers/power/pmic/as3722_gpio.c
> b/drivers/power/pmic/as3722_gpio.c new file mode 100644
> index 0000000000..d0b681ca4a
> --- /dev/null
> +++ b/drivers/power/pmic/as3722_gpio.c
> @@ -0,0 +1,120 @@
> +/*
> + * Copyright (C) 2014 NVIDIA Corporation
> + *
> + * SPDX-License-Identifier: GPL-2.0+
> + */
> +
> +#include <common.h>
> +#include <dm.h>
> +#include <asm/gpio.h>
> +#include <power/as3722.h>
> +#include <power/pmic.h>
> +
> +#define NUM_GPIOS	8
> +
> +int as3722_gpio_configure(struct udevice *pmic, unsigned int gpio,
> +			  unsigned long flags)
> +{
> +	u8 value = 0;
> +	int err;
> +
> +	if (flags & AS3722_GPIO_OUTPUT_VDDH)
> +		value |= AS3722_GPIO_CONTROL_MODE_OUTPUT_VDDH;
> +
> +	if (flags & AS3722_GPIO_INVERT)
> +		value |= AS3722_GPIO_CONTROL_INVERT;
> +
> +	err = pmic_reg_write(pmic, AS3722_GPIO_CONTROL(gpio), value);
> +	if (err) {
> +		error("failed to configure GPIO#%u: %d", gpio, err);
> +		return err;
> +	}
> +
> +	return 0;
> +}
> +
> +static int as3722_gpio_set_value(struct udevice *dev, unsigned int
> gpio,
> +				 int level)
> +{
> +	struct udevice *pmic = dev_get_parent(dev);
> +	const char *l;
> +	u8 value;
> +	int err;
> +
> +	if (gpio >= NUM_GPIOS)
> +		return -EINVAL;
> +
> +	err = pmic_reg_read(pmic, AS3722_GPIO_SIGNAL_OUT);
> +	if (err < 0) {
> +		error("failed to read GPIO signal out register: %d",
> err);
> +		return err;
> +	}
> +	value = err;
> +
> +	if (level == 0) {
> +		value &= ~(1 << gpio);
> +		l = "low";
> +	} else {
> +		value |= 1 << gpio;
> +		l = "high";
> +	}
> +
> +	err = pmic_reg_write(pmic, AS3722_GPIO_SIGNAL_OUT, value);
> +	if (err) {
> +		error("failed to set GPIO#%u %s: %d", gpio, l, err);
> +		return err;
> +	}
> +
> +	return 0;
> +}
> +
> +int as3722_gpio_direction_output(struct udevice *dev, unsigned int
> gpio,
> +				 int value)
> +{
> +	struct udevice *pmic = dev_get_parent(dev);
> +	int err;
> +
> +	if (gpio > 7)
> +		return -EINVAL;
> +
> +	if (value == 0)
> +		value = AS3722_GPIO_CONTROL_MODE_OUTPUT_VDDL;
> +	else
> +		value = AS3722_GPIO_CONTROL_MODE_OUTPUT_VDDH;
> +
> +	err = pmic_reg_write(pmic, AS3722_GPIO_CONTROL(gpio), value);
> +	if (err) {
> +		error("failed to configure GPIO#%u as output: %d",
> gpio, err);
> +		return err;
> +	}
> +
> +	err = as3722_gpio_set_value(pmic, gpio, value);
> +	if (err < 0) {
> +		error("failed to set GPIO#%u high: %d", gpio, err);
> +		return err;
> +	}
> +
> +	return 0;
> +}
> +
> +static int as3722_gpio_probe(struct udevice *dev)
> +{
> +	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
> +
> +	uc_priv->gpio_count = NUM_GPIOS;
> +	uc_priv->bank_name = "as3722_";
> +
> +	return 0;
> +}
> +
> +static const struct dm_gpio_ops gpio_as3722_ops = {
> +	.direction_output	= as3722_gpio_direction_output,
> +	.set_value		= as3722_gpio_set_value,
> +};
> +
> +U_BOOT_DRIVER(gpio_as3722) = {
> +	.name	= "gpio_as3722",
> +	.id	= UCLASS_GPIO,
> +	.ops	= &gpio_as3722_ops,
> +	.probe	= as3722_gpio_probe,
> +};
> diff --git a/include/power/as3722.h b/include/power/as3722.h
> index 14afa0c81a..713e79840f 100644
> --- a/include/power/as3722.h
> +++ b/include/power/as3722.h
> @@ -20,6 +20,11 @@
>  #define AS3722_ASIC_ID1 0x90
>  #define AS3722_ASIC_ID2 0x91
>  
> +#define AS3722_GPIO_CONTROL(n) (0x08 + (n))
> +#define AS3722_GPIO_CONTROL_MODE_OUTPUT_VDDH (1 << 0)
> +#define AS3722_GPIO_CONTROL_MODE_OUTPUT_VDDL (7 << 0)
> +#define AS3722_GPIO_CONTROL_INVERT (1 << 7)
> +
>  struct udevice;
>  
>  int as3722_init(struct udevice **devp);




Best regards,

Lukasz Majewski

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