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pinctrl: qcom: add get_direction function

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The get_direction callback function allows gpiolib to know the current
direction (input vs output) for a given GPIO.

This is particularly useful on ACPI systems, where the GPIOs are
configured only by firmware (typically UEFI), so the only way to
know the initial values to query the hardware directly.  Without
this function, gpiolib thinks that all GPIOs are configured for
input.

Signed-off-by: Timur Tabi <timur@codeaurora.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Timur Tabi 2017-02-10 17:21:00 -06:00 committed by Linus Walleij
parent c1ae3cfa0e
commit 8e51533780
1 changed files with 15 additions and 0 deletions
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15
drivers/pinctrl/qcom/pinctrl-msm.c
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@ -422,6 +422,20 @@ static int msm_gpio_direction_output(struct gpio_chip *chip, unsigned offset, in
return 0; return 0;
} }
static int msm_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
{
struct msm_pinctrl *pctrl = gpiochip_get_data(chip);
const struct msm_pingroup *g;
u32 val;
g = &pctrl->soc->groups[offset];
val = readl(pctrl->regs + g->ctl_reg);
/* 0 = output, 1 = input */
return val & BIT(g->oe_bit) ? 0 : 1;
}
static int msm_gpio_get(struct gpio_chip *chip, unsigned offset) static int msm_gpio_get(struct gpio_chip *chip, unsigned offset)
{ {
const struct msm_pingroup *g; const struct msm_pingroup *g;
@ -510,6 +524,7 @@ static void msm_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
static struct gpio_chip msm_gpio_template = { static struct gpio_chip msm_gpio_template = {
.direction_input = msm_gpio_direction_input, .direction_input = msm_gpio_direction_input,
.direction_output = msm_gpio_direction_output, .direction_output = msm_gpio_direction_output,
.get_direction = msm_gpio_get_direction,
.get = msm_gpio_get, .get = msm_gpio_get,
.set = msm_gpio_set, .set = msm_gpio_set,
.request = gpiochip_generic_request, .request = gpiochip_generic_request,