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pinctrl: gpio: Add callback for configuring pin as GPIO

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Add callback to configure, and de-configure, pin as a GPIO on the
pin controller side. This matches similar functionality in Linux
and aims to replace the ad-hoc implementations present in U-Boot.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Alex Kiernan <alex.kiernan@gmail.com>
Cc: Christoph Muellner <christoph.muellner@theobroma-systems.com>
Cc: Eugeniu Rosca <roscaeugeniu@gmail.com>
Cc: Patrice Chotard <patrice.chotard@st.com>
Cc: Patrick DELAUNAY <patrick.delaunay@st.com>
Cc: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Cc: Simon Glass <sjg@chromium.org>
This commit is contained in:
Marek Vasut 2019-04-21 23:57:23 +02:00 committed by Marek Vasut
parent 175f502734
commit ae59d7ca59
2 changed files with 140 additions and 0 deletions
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96
drivers/pinctrl/pinctrl-uclass.c
View file

@ -172,6 +172,102 @@ static int pinconfig_post_bind(struct udevice *dev)
}
#endif
static int
pinctrl_gpio_get_pinctrl_and_offset(struct udevice *dev, unsigned offset,
struct udevice **pctldev,
unsigned int *pin_selector)
{
struct ofnode_phandle_args args;
unsigned gpio_offset, pfc_base, pfc_pins;
int ret;
ret = dev_read_phandle_with_args(dev, "gpio-ranges", NULL, 3,
0, &args);
if (ret) {
dev_dbg(dev, "%s: dev_read_phandle_with_args: err=%d\n",
__func__, ret);
return ret;
}
ret = uclass_get_device_by_ofnode(UCLASS_PINCTRL,
args.node, pctldev);
if (ret) {
dev_dbg(dev,
"%s: uclass_get_device_by_of_offset failed: err=%d\n",
__func__, ret);
return ret;
}
gpio_offset = args.args[0];
pfc_base = args.args[1];
pfc_pins = args.args[2];
if (offset < gpio_offset || offset > gpio_offset + pfc_pins) {
dev_dbg(dev,
"%s: GPIO can not be mapped to pincontrol pin\n",
__func__);
return -EINVAL;
}
offset -= gpio_offset;
offset += pfc_base;
*pin_selector = offset;
return 0;
}
/**
* pinctrl_gpio_request() - request a single pin to be used as GPIO
*
* @dev: GPIO peripheral device
* @offset: the GPIO pin offset from the GPIO controller
* @return: 0 on success, or negative error code on failure
*/
int pinctrl_gpio_request(struct udevice *dev, unsigned offset)
{
const struct pinctrl_ops *ops;
struct udevice *pctldev;
unsigned int pin_selector;
int ret;
ret = pinctrl_gpio_get_pinctrl_and_offset(dev, offset,
&pctldev, &pin_selector);
if (ret)
return ret;
ops = pinctrl_get_ops(pctldev);
if (!ops || !ops->gpio_request_enable)
return -ENOTSUPP;
return ops->gpio_request_enable(pctldev, pin_selector);
}
/**
* pinctrl_gpio_free() - free a single pin used as GPIO
*
* @dev: GPIO peripheral device
* @offset: the GPIO pin offset from the GPIO controller
* @return: 0 on success, or negative error code on failure
*/
int pinctrl_gpio_free(struct udevice *dev, unsigned offset)
{
const struct pinctrl_ops *ops;
struct udevice *pctldev;
unsigned int pin_selector;
int ret;
ret = pinctrl_gpio_get_pinctrl_and_offset(dev, offset,
&pctldev, &pin_selector);
if (ret)
return ret;
ops = pinctrl_get_ops(pctldev);
if (!ops || !ops->gpio_disable_free)
return -ENOTSUPP;
return ops->gpio_disable_free(pctldev, pin_selector);
}
/**
* pinctrl_select_state_simple() - simple implementation of pinctrl_select_state
*

44
include/dm/pinctrl.h
View file

@ -70,6 +70,13 @@ struct pinconf_param {
* @set_state_simple: do needed pinctrl operations for a peripherl @periph.
* (necessary for pinctrl_simple)
* @get_pin_muxing: display the muxing of a given pin.
* @gpio_request_enable: requests and enables GPIO on a certain pin.
* Implement this only if you can mux every pin individually as GPIO. The
* affected GPIO range is passed along with an offset(pin number) into that
* specific GPIO range - function selectors and pin groups are orthogonal
* to this, the core will however make sure the pins do not collide.
* @gpio_disable_free: free up GPIO muxing on a certain pin, the reverse of
* @gpio_request_enable
*/
struct pinctrl_ops {
int (*get_pins_count)(struct udevice *dev);
@ -151,6 +158,24 @@ struct pinctrl_ops {
*/
int (*get_pin_muxing)(struct udevice *dev, unsigned int selector,
char *buf, int size);
/**
* gpio_request_enable: requests and enables GPIO on a certain pin.
*
* @dev: Pinctrl device to use
* @selector: Pin selector
* return 0 if OK, -ve on error
*/
int (*gpio_request_enable)(struct udevice *dev, unsigned int selector);
/**
* gpio_disable_free: free up GPIO muxing on a certain pin.
*
* @dev: Pinctrl device to use
* @selector: Pin selector
* return 0 if OK, -ve on error
*/
int (*gpio_disable_free)(struct udevice *dev, unsigned int selector);
};
#define pinctrl_get_ops(dev) ((struct pinctrl_ops *)(dev)->driver->ops)
@ -407,4 +432,23 @@ int pinctrl_get_pins_count(struct udevice *dev);
*/
int pinctrl_get_pin_name(struct udevice *dev, int selector, char *buf,
int size);
/**
* pinctrl_gpio_request() - request a single pin to be used as GPIO
*
* @dev: GPIO peripheral device
* @offset: the GPIO pin offset from the GPIO controller
* @return: 0 on success, or negative error code on failure
*/
int pinctrl_gpio_request(struct udevice *dev, unsigned offset);
/**
* pinctrl_gpio_free() - free a single pin used as GPIO
*
* @dev: GPIO peripheral device
* @offset: the GPIO pin offset from the GPIO controller
* @return: 0 on success, or negative error code on failure
*/
int pinctrl_gpio_free(struct udevice *dev, unsigned offset);
#endif /* __PINCTRL_H */