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| author |   Linus Walleij <linus.walleij@linaro.org> | 2020-07-14 09:22:26 +0200 |
|---|---|---|
| committer |   Mark Brown <broonie@kernel.org> | 2020-07-22 01:55:52 +0100 |
| commit | 4726773292bfdb2917a0b4d369ddccd5e2f30991 (patch) | |
| tree | 5135485a8826beff6ea4b26c569bde9c2905ff6a /drivers/gpio | |
| parent | spi: spi-cadence: add support for chip select high (diff) | |
| download | wireguard-linux-4726773292bfdb2917a0b4d369ddccd5e2f30991.tar.xz wireguard-linux-4726773292bfdb2917a0b4d369ddccd5e2f30991.zip | |
spi: ppc4xx: Convert to use GPIO descriptors
This converts the PPC4xx SPI driver to use GPIO descriptors.
The driver is already just picking some GPIOs from the device
tree so the conversion is pretty straight forward. However
this driver is looking form a pure "gpios" property rather
than the standard binding "cs-gpios" so we need to add a new
exception to the gpiolib OF parser to allow this for this
driver's compatibles.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Cc: linuxppc-dev@lists.ozlabs.org
Link: https://lore.kernel.org/r/20200714072226.26071-1-linus.walleij@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/gpiolib-of.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c index 219eb0054233..e3e88510aec7 100644 --- a/drivers/gpio/gpiolib-of.c +++ b/drivers/gpio/gpiolib-of.c @@ -26,7 +26,7 @@ /** * of_gpio_spi_cs_get_count() - special GPIO counting for SPI * Some elder GPIO controllers need special quirks. Currently we handle - * the Freescale GPIO controller with bindings that doesn't use the + * the Freescale and PPC GPIO controller with bindings that doesn't use the * established "cs-gpios" for chip selects but instead rely on * "gpios" for the chip select lines. If we detect this, we redirect * the counting of "cs-gpios" to count "gpios" transparent to the @@ -41,7 +41,8 @@ static int of_gpio_spi_cs_get_count(struct device *dev, const char *con_id) if (!con_id || strcmp(con_id, "cs")) return 0; if (!of_device_is_compatible(np, "fsl,spi") && - !of_device_is_compatible(np, "aeroflexgaisler,spictrl")) + !of_device_is_compatible(np, "aeroflexgaisler,spictrl") && + !of_device_is_compatible(np, "ibm,ppc4xx-spi")) return 0; return of_gpio_named_count(np, "gpios"); } @@ -405,9 +406,10 @@ static struct gpio_desc *of_find_spi_cs_gpio(struct device *dev, if (!IS_ENABLED(CONFIG_SPI_MASTER)) return ERR_PTR(-ENOENT); - /* Allow this specifically for Freescale devices */ + /* Allow this specifically for Freescale and PPC devices */ if (!of_device_is_compatible(np, "fsl,spi") && - !of_device_is_compatible(np, "aeroflexgaisler,spictrl")) + !of_device_is_compatible(np, "aeroflexgaisler,spictrl") && + !of_device_is_compatible(np, "ibm,ppc4xx-spi")) return ERR_PTR(-ENOENT); /* Allow only if asking for "cs-gpios" */ if (!con_id || strcmp(con_id, "cs")) |