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pinctrl: intel: Implement high impedance support

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Implement high impedance support for Intel pin control hardware.
It allows to set high impedance and check it.

Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
This commit is contained in:
Andy Shevchenko 2024-08-29 16:59:18 +03:00
parent 91946ccbe7
commit 13791bb6bf
1 changed files with 41 additions and 0 deletions
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41
drivers/pinctrl/intel/pinctrl-intel.c
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@ -652,6 +652,23 @@ static int intel_config_get_pull(struct intel_pinctrl *pctrl, unsigned int pin,
return 0;
}
static int intel_config_get_high_impedance(struct intel_pinctrl *pctrl, unsigned int pin,
enum pin_config_param param, u32 *arg)
{
void __iomem *padcfg0;
u32 value;
padcfg0 = intel_get_padcfg(pctrl, pin, PADCFG0);
scoped_guard(raw_spinlock_irqsave, &pctrl->lock)
value = readl(padcfg0);
if (__intel_gpio_get_direction(value) != PAD_CONNECT_NONE)
return -EINVAL;
return 0;
}
static int intel_config_get_debounce(struct intel_pinctrl *pctrl, unsigned int pin,
enum pin_config_param param, u32 *arg)
{
@ -695,6 +712,12 @@ static int intel_config_get(struct pinctrl_dev *pctldev, unsigned int pin,
return ret;
break;
case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
ret = intel_config_get_high_impedance(pctrl, pin, param, &arg);
if (ret)
return ret;
break;
case PIN_CONFIG_INPUT_DEBOUNCE:
ret = intel_config_get_debounce(pctrl, pin, param, &arg);
if (ret)
@ -793,6 +816,20 @@ static int intel_config_set_pull(struct intel_pinctrl *pctrl, unsigned int pin,
return 0;
}
static void intel_gpio_set_high_impedance(struct intel_pinctrl *pctrl, unsigned int pin)
{
void __iomem *padcfg0;
u32 value;
padcfg0 = intel_get_padcfg(pctrl, pin, PADCFG0);
guard(raw_spinlock_irqsave)(&pctrl->lock);
value = readl(padcfg0);
value = __intel_gpio_set_direction(value, false, false);
writel(value, padcfg0);
}
static int intel_config_set_debounce(struct intel_pinctrl *pctrl,
unsigned int pin, unsigned int debounce)
{
@ -855,6 +892,10 @@ static int intel_config_set(struct pinctrl_dev *pctldev, unsigned int pin,
return ret;
break;
case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
intel_gpio_set_high_impedance(pctrl, pin);
break;
case PIN_CONFIG_INPUT_DEBOUNCE:
ret = intel_config_set_debounce(pctrl, pin,
pinconf_to_config_argument(configs[i]));