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pinctrl: mediatek: Add gpio_request_enable support 

Implement the .gpio_request_enable() callbacks in struct pinmux_ops
in mediatek pinctrl driver. Make sure that when gpio_request is called,
GPIO on the pin is enabled.

Signed-off-by: Biao Huang <biao.huang@mediatek.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Biao Huang 2016-02-03 09:24:46 +08:00 committed by Linus Walleij
parent 148b95eea0
commit 59ee9c96dd
1 changed files with 36 additions and 0 deletions
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36
drivers/pinctrl/mediatek/pinctrl-mtk-common.c
View File

@ -43,6 +43,7 @@
#define MAX_GPIO_MODE_PER_REG 5
#define GPIO_MODE_BITS 3
#define GPIO_MODE_PREFIX "GPIO"
static const char * const mtk_gpio_functions[] = {
"func0", "func1", "func2", "func3",
@ -733,12 +734,47 @@ static int mtk_pmx_set_mux(struct pinctrl_dev *pctldev,
return 0;
}
static int mtk_pmx_find_gpio_mode(struct mtk_pinctrl *pctl,
unsigned offset)
{
const struct mtk_desc_pin *pin = pctl->devdata->pins + offset;
const struct mtk_desc_function *func = pin->functions;
while (func && func->name) {
if (!strncmp(func->name, GPIO_MODE_PREFIX,
sizeof(GPIO_MODE_PREFIX)-1))
return func->muxval;
func++;
}
return -EINVAL;
}
static int mtk_pmx_gpio_request_enable(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range,
unsigned offset)
{
unsigned long muxval;
struct mtk_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
muxval = mtk_pmx_find_gpio_mode(pctl, offset);
if (muxval < 0) {
dev_err(pctl->dev, "invalid gpio pin %d.\n", offset);
return -EINVAL;
}
mtk_pmx_set_mode(pctldev, offset, muxval);
return 0;
}
static const struct pinmux_ops mtk_pmx_ops = {
.get_functions_count = mtk_pmx_get_funcs_cnt,
.get_function_name = mtk_pmx_get_func_name,
.get_function_groups = mtk_pmx_get_func_groups,
.set_mux = mtk_pmx_set_mux,
.gpio_set_direction = mtk_pmx_gpio_set_direction,
.gpio_request_enable = mtk_pmx_gpio_request_enable,
};
static int mtk_gpio_direction_input(struct gpio_chip *chip,