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pinctrl: bcm2835: Implement bcm2711_pinconf_get

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The BCM2711 allows to read the bias config. So implement pin_conf_get
accordingly. The pull resistor values has been taken from the
BCM2711/7211 datasheet.

This implementation assumes that BCM7211 behaves the same way.

Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Tested-by: Florian Fainelli <florian.fainelli@broadcom.com>
Message-ID: <20240307070113.4888-3-wahrenst@gmx.net>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Stefan Wahren
2024-03-07 08:01:13 +01:00
committed by Linus Walleij
parent 85b02bc078
commit d54e4cda29
1 changed files with 40 additions and 1 deletions
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drivers/pinctrl/bcm/pinctrl-bcm2835.c
+40 -1
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@@ -1098,6 +1098,45 @@ static const struct pinconf_ops bcm2835_pinconf_ops = {
.pin_config_set = bcm2835_pinconf_set,
};
static int bcm2711_pinconf_get(struct pinctrl_dev *pctldev, unsigned pin,
unsigned long *config)
{
struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
enum pin_config_param param = pinconf_to_config_param(*config);
u32 offset, shift, val;
offset = PUD_2711_REG_OFFSET(pin);
shift = PUD_2711_REG_SHIFT(pin);
val = bcm2835_gpio_rd(pc, GP_GPIO_PUP_PDN_CNTRL_REG0 + (offset * 4));
switch (param) {
case PIN_CONFIG_BIAS_DISABLE:
if (((val >> shift) & PUD_2711_MASK) != BCM2711_PULL_NONE)
return -EINVAL;
break;
case PIN_CONFIG_BIAS_PULL_UP:
if (((val >> shift) & PUD_2711_MASK) != BCM2711_PULL_UP)
return -EINVAL;
*config = pinconf_to_config_packed(param, 50000);
break;
case PIN_CONFIG_BIAS_PULL_DOWN:
if (((val >> shift) & PUD_2711_MASK) != BCM2711_PULL_DOWN)
return -EINVAL;
*config = pinconf_to_config_packed(param, 50000);
break;
default:
return bcm2835_pinconf_get(pctldev, pin, config);
}
return 0;
}
static void bcm2711_pull_config_set(struct bcm2835_pinctrl *pc,
unsigned int pin, unsigned int arg)
{
@@ -1165,7 +1204,7 @@ static int bcm2711_pinconf_set(struct pinctrl_dev *pctldev,
static const struct pinconf_ops bcm2711_pinconf_ops = {
.is_generic = true,
.pin_config_get = bcm2835_pinconf_get,
.pin_config_get = bcm2711_pinconf_get,
.pin_config_set = bcm2711_pinconf_set,
};