Before using the cs_gpio, check if the GPIO is valid or not.

Signed-off-by: Wenyou Yang wenyou.yang@atmel.com ---

Changes in v3: - According to the advice from Jagan Teki, rearrange the code.

Changes in v2: - Rebase on v2017.03.

drivers/spi/atmel_spi.c | 9 +++++++++ 1 file changed, 9 insertions(+)

diff --git a/drivers/spi/atmel_spi.c b/drivers/spi/atmel_spi.c index 7649114231..4701b79f16 100644 --- a/drivers/spi/atmel_spi.c +++ b/drivers/spi/atmel_spi.c @@ -296,6 +296,9 @@ static void atmel_spi_cs_activate(struct udevice *dev) struct dm_spi_slave_platdata *slave_plat = dev_get_parent_platdata(dev); u32 cs = slave_plat->cs;

+ if (!dm_gpio_is_valid(&priv->cs_gpios[cs])) + return; + dm_gpio_set_value(&priv->cs_gpios[cs], 0); }

@@ -306,6 +309,9 @@ static void atmel_spi_cs_deactivate(struct udevice *dev) struct dm_spi_slave_platdata *slave_plat = dev_get_parent_platdata(dev); u32 cs = slave_plat->cs;

+ if (!dm_gpio_is_valid(&priv->cs_gpios[cs])) + return; + dm_gpio_set_value(&priv->cs_gpios[cs], 1); }

@@ -473,6 +479,9 @@ static int atmel_spi_probe(struct udevice *bus) }

for(i = 0; i < ARRAY_SIZE(priv->cs_gpios); i++) { + if (!dm_gpio_is_valid(&priv->cs_gpios[i])) + continue; + dm_gpio_set_dir_flags(&priv->cs_gpios[i], GPIOD_IS_OUT | GPIOD_IS_OUT_ACTIVE); }