spi: spi-gpio: Use 'cansleep' variants to access GPIO

The GPIO chip in use could be of any kind, and therefore might sleep
when accesing the GPIO lines. Take account of this by using cansleep
instead, which is the most generic case.
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

drivers/spi/spi-gpio.c

@@ -115,17 +115,17 @@ spi_to_pdata(const struct spi_device *spi)
 
 static inline void setsck(const struct spi_device *spi, int is_on)
 {
-	gpio_set_value(SPI_SCK_GPIO, is_on);
+	gpio_set_value_cansleep(SPI_SCK_GPIO, is_on);
 }
 
 static inline void setmosi(const struct spi_device *spi, int is_on)
 {
-	gpio_set_value(SPI_MOSI_GPIO, is_on);
+	gpio_set_value_cansleep(SPI_MOSI_GPIO, is_on);
 }
 
 static inline int getmiso(const struct spi_device *spi)
 {
-	return !!gpio_get_value(SPI_MISO_GPIO);
+	return !!gpio_get_value_cansleep(SPI_MISO_GPIO);
 }
 
 #undef pdata
@@ -229,7 +229,7 @@ static void spi_gpio_chipselect(struct spi_device *spi, int is_active)
 
 	if (cs != SPI_GPIO_NO_CHIPSELECT) {
 		/* SPI is normally active-low */
-		gpio_set_value(cs, (spi->mode & SPI_CS_HIGH) ? is_active : !is_active);
+		gpio_set_value_cansleep(cs, (spi->mode & SPI_CS_HIGH) ? is_active : !is_active);
 	}
 }