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author | Marek Vasut <marek.vasut+renesas@gmail.com> | 2019-04-22 00:57:23 +0300 |
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committer | Marek Vasut <marex@denx.de> | 2019-05-04 20:26:49 +0300 |
commit | ae59d7ca59dbfc770531f51c717dc6f5d9a18f78 (patch) | |
tree | 085d88b860d48e92aa9ed290a80e391cb9044162 /drivers/pinctrl | |
parent | 175f5027345c7feaa41e8f4201778814bf72fe37 (diff) | |
download | u-boot-ae59d7ca59dbfc770531f51c717dc6f5d9a18f78.tar.xz |
pinctrl: gpio: Add callback for configuring pin as GPIO
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>
Diffstat (limited to 'drivers/pinctrl')
-rw-r--r-- | drivers/pinctrl/pinctrl-uclass.c | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/drivers/pinctrl/pinctrl-uclass.c b/drivers/pinctrl/pinctrl-uclass.c index f01bc77a57..5b1cd29d86 100644 --- a/drivers/pinctrl/pinctrl-uclass.c +++ b/drivers/pinctrl/pinctrl-uclass.c @@ -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 * |