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pinctrl: rockchip: implement PIN_CONFIG_OUTPUT handling

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In some cases it is nice to be able to simply control a gpio output
via the PIN_CONFIG_OUTPUT option without having a driver control it.
Thus add support for it to the rockchip pinctrl driver.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Heiko Stübner 2014-04-23 14:28:59 +02:00 committed by Linus Walleij
parent dab3eba7c1
commit a076e2ed3f
1 changed files with 40 additions and 0 deletions
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40
drivers/pinctrl/pinctrl-rockchip.c
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@ -329,6 +329,23 @@ static const struct pinctrl_ops rockchip_pctrl_ops = {
* Hardware access
*/
static int rockchip_get_mux(struct rockchip_pin_bank *bank, int pin)
{
struct rockchip_pinctrl *info = bank->drvdata;
void __iomem *reg = info->reg_base + info->ctrl->mux_offset;
u8 bit;
if (bank->bank_type == RK3188_BANK0 && pin < 16)
return RK_FUNC_GPIO;
/* get basic quadrupel of mux registers and the correct reg inside */
reg += bank->bank_num * 0x10;
reg += (pin / 8) * 4;
bit = (pin % 8) * 2;
return ((readl(reg) >> bit) & 3);
}
/*
* Set a new mux function for a pin.
*
@ -687,6 +704,10 @@ static bool rockchip_pinconf_pull_valid(struct rockchip_pin_ctrl *ctrl,
return false;
}
static int rockchip_gpio_direction_output(struct gpio_chip *gc,
unsigned offset, int value);
static int rockchip_gpio_get(struct gpio_chip *gc, unsigned offset);
/* set the pin config settings for a specified pin */
static int rockchip_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
unsigned long *configs, unsigned num_configs)
@ -724,6 +745,13 @@ static int rockchip_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
if (rc)
return rc;
break;
case PIN_CONFIG_OUTPUT:
rc = rockchip_gpio_direction_output(&bank->gpio_chip,
pin - bank->pin_base,
arg);
if (rc)
return rc;
break;
default:
return -ENOTSUPP;
break;
@ -741,6 +769,7 @@ static int rockchip_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
struct rockchip_pin_bank *bank = pin_to_bank(info, pin);
enum pin_config_param param = pinconf_to_config_param(*config);
u16 arg;
int rc;
switch (param) {
case PIN_CONFIG_BIAS_DISABLE:
@ -761,6 +790,17 @@ static int rockchip_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
arg = 1;
break;
case PIN_CONFIG_OUTPUT:
rc = rockchip_get_mux(bank, pin - bank->pin_base);
if (rc != RK_FUNC_GPIO)
return -EINVAL;
rc = rockchip_gpio_get(&bank->gpio_chip, pin - bank->pin_base);
if (rc < 0)
return rc;
arg = rc ? 1 : 0;
break;
default:
return -ENOTSUPP;
break;