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pinctrl: cherryview: add option to set open-drain pin config 

On some CHV platforms, we need an option to configure the
open-drain setting for these pins.  This adds support for the
PIN_CONFIG_DRIVE_PUSH_PULL and PIN_CONFIG_DRIVE_OPEN_DRAIN to
disable/enable open-drain mode for a specific pin.

Signed-off-by: Dan O'Donovan <dan@emutex.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Dan O'Donovan 2016-06-10 13:23:35 +01:00 committed by Linus Walleij
parent 0bd50d719b
commit ccdf81d08d
1 changed files with 33 additions and 0 deletions
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33
drivers/pinctrl/intel/pinctrl-cherryview.c
View File

@ -1108,6 +1108,27 @@ static int chv_config_set_pull(struct chv_pinctrl *pctrl, unsigned pin,
return 0;
}
static int chv_config_set_oden(struct chv_pinctrl *pctrl, unsigned int pin,
bool enable)
{
void __iomem *reg = chv_padreg(pctrl, pin, CHV_PADCTRL1);
unsigned long flags;
u32 ctrl1;
raw_spin_lock_irqsave(&chv_lock, flags);
ctrl1 = readl(reg);
if (enable)
ctrl1 |= CHV_PADCTRL1_ODEN;
else
ctrl1 &= ~CHV_PADCTRL1_ODEN;
chv_writel(ctrl1, reg);
raw_spin_unlock_irqrestore(&chv_lock, flags);
return 0;
}
static int chv_config_set(struct pinctrl_dev *pctldev, unsigned pin,
unsigned long *configs, unsigned nconfigs)
{
@ -1132,6 +1153,18 @@ static int chv_config_set(struct pinctrl_dev *pctldev, unsigned pin,
return ret;
break;
case PIN_CONFIG_DRIVE_PUSH_PULL:
ret = chv_config_set_oden(pctrl, pin, false);
if (ret)
return ret;
break;
case PIN_CONFIG_DRIVE_OPEN_DRAIN:
ret = chv_config_set_oden(pctrl, pin, true);
if (ret)
return ret;
break;
default:
return -ENOTSUPP;
}