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gpiolib: of: factor out quirk setting polarity via separate property

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Several legacy bindings use a separate property to specify polarity of
GPIOs instead of specifying it directly in the GPIO property. Factor
out this code to make it easier to add more such cases.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
This commit is contained in:
Dmitry Torokhov 2022-10-29 21:40:46 -07:00 committed by Bartosz Golaszewski
parent d59fdbc716
commit 34cb9352b6
1 changed files with 53 additions and 45 deletions
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98
drivers/gpio/gpiolib-of.c
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@ -186,33 +186,68 @@ static void of_gpio_try_fixup_polarity(const struct device_node *np,
}
}
static void of_gpio_flags_quirks(const struct device_node *np,
const char *propname,
enum of_gpio_flags *flags,
int index)
static void of_gpio_set_polarity_by_property(const struct device_node *np,
const char *propname,
enum of_gpio_flags *flags)
{
of_gpio_try_fixup_polarity(np, propname, flags);
static const struct {
const char *compatible;
const char *gpio_propname;
const char *polarity_propname;
} gpios[] = {
#if IS_ENABLED(CONFIG_FEC)
/* Freescale Fast Ethernet Controller */
{ "fsl,imx25-fec", "phy-reset-gpios", "phy-reset-active-high" },
{ "fsl,imx27-fec", "phy-reset-gpios", "phy-reset-active-high" },
{ "fsl,imx28-fec", "phy-reset-gpios", "phy-reset-active-high" },
{ "fsl,imx6q-fec", "phy-reset-gpios", "phy-reset-active-high" },
{ "fsl,mvf600-fec", "phy-reset-gpios", "phy-reset-active-high" },
{ "fsl,imx6sx-fec", "phy-reset-gpios", "phy-reset-active-high" },
{ "fsl,imx6ul-fec", "phy-reset-gpios", "phy-reset-active-high" },
{ "fsl,imx8mq-fec", "phy-reset-gpios", "phy-reset-active-high" },
{ "fsl,imx8qm-fec", "phy-reset-gpios", "phy-reset-active-high" },
{ "fsl,s32v234-fec", "phy-reset-gpios", "phy-reset-active-high" },
#endif
/*
* Some GPIO fixed regulator quirks.
* Note that active low is the default.
*/
if (IS_ENABLED(CONFIG_REGULATOR) &&
(of_device_is_compatible(np, "regulator-fixed") ||
of_device_is_compatible(np, "reg-fixed-voltage") ||
(!(strcmp(propname, "enable-gpio") &&
strcmp(propname, "enable-gpios")) &&
of_device_is_compatible(np, "regulator-gpio")))) {
bool active_high = of_property_read_bool(np,
"enable-active-high");
/*
* The regulator GPIO handles are specified such that the
* presence or absence of "enable-active-high" solely controls
* the polarity of the GPIO line. Any phandle flags must
* be actively ignored.
*/
of_gpio_quirk_polarity(np, active_high, flags);
#if IS_ENABLED(CONFIG_REGULATOR_FIXED_VOLTAGE)
{ "regulator-fixed", "gpios", "enable-active-high" },
{ "regulator-fixed", "gpio", "enable-active-high" },
{ "reg-fixed-voltage", "gpios", "enable-active-high" },
{ "reg-fixed-voltage", "gpio", "enable-active-high" },
#endif
#if IS_ENABLED(CONFIG_REGULATOR_GPIO)
{ "regulator-gpio", "enable-gpio", "enable-active-high" },
{ "regulator-gpio", "enable-gpios", "enable-active-high" },
#endif
};
unsigned int i;
bool active_high;
for (i = 0; i < ARRAY_SIZE(gpios); i++) {
if (of_device_is_compatible(np, gpios[i].compatible) &&
!strcmp(propname, gpios[i].gpio_propname)) {
active_high = of_property_read_bool(np,
gpios[i].polarity_propname);
of_gpio_quirk_polarity(np, active_high, flags);
break;
}
}
}
static void of_gpio_flags_quirks(const struct device_node *np,
const char *propname,
enum of_gpio_flags *flags,
int index)
{
of_gpio_try_fixup_polarity(np, propname, flags);
of_gpio_set_polarity_by_property(np, propname, flags);
/*
* Legacy open drain handling for fixed voltage regulators.
*/
@ -267,33 +302,6 @@ static void of_gpio_flags_quirks(const struct device_node *np,
!strcmp(propname, "snps,reset-gpio") &&
of_property_read_bool(np, "snps,reset-active-low"))
*flags |= OF_GPIO_ACTIVE_LOW;
/*
* Freescale Fast Ethernet Controller uses a separate property to
* describe polarity of the phy reset line.
*/
if (IS_ENABLED(CONFIG_FEC)) {
static const char * const fec_devices[] = {
"fsl,imx25-fec",
"fsl,imx27-fec",
"fsl,imx28-fec",
"fsl,imx6q-fec",
"fsl,mvf600-fec",
"fsl,imx6sx-fec",
"fsl,imx6ul-fec",
"fsl,imx8mq-fec",
"fsl,imx8qm-fec",
"fsl,s32v234-fec",
NULL
};
if (!strcmp(propname, "phy-reset-gpios") &&
of_device_compatible_match(np, fec_devices)) {
bool active_high = of_property_read_bool(np,
"phy-reset-active-high");
of_gpio_quirk_polarity(np, active_high, flags);
}
}
}
/**