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spi: atmel_spi: Configure CS GPIO as output 

On AT91 GPIOs default to being inputs, so we need to explicitly
configure CS gpio to being an output.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Andrey Smirnov 2017-03-08 14:09:07 -08:00 committed by Sascha Hauer
parent d5f52220e6
commit dd0f42879b
1 changed files with 5 additions and 1 deletions
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6
drivers/spi/atmel_spi.c
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@ -172,6 +172,8 @@ static int atmel_spi_setup(struct spi_device *spi)
struct spi_master *master = spi->master;
struct atmel_spi *as = to_atmel_spi(master);
int npcs_pin;
unsigned active = spi->mode & SPI_CS_HIGH;
u32 scbr, csr;
unsigned int bits = spi->bits_per_word;
unsigned long bus_hz;
@ -183,6 +185,8 @@ static int atmel_spi_setup(struct spi_device *spi)
return -EINVAL;
}
npcs_pin = as->cs_pins[spi->chip_select];
if (bits < 8 || bits > 16) {
dev_dbg(&spi->dev,
"setup: invalid bits_per_word %u (8 to 16)\n",
@ -235,7 +239,7 @@ static int atmel_spi_setup(struct spi_device *spi)
csr |= SPI_BF(DLYBS, 0);
csr |= SPI_BF(DLYBCT, 0);
/* gpio_direction_output(npcs_pin, !(spi->mode & SPI_CS_HIGH)); */
gpio_direction_output(npcs_pin, !active);
dev_dbg(master->dev,
"setup: %lu Hz bpw %u mode 0x%x -> csr%d %08x\n",
bus_hz / scbr, bits, spi->mode, spi->chip_select, csr);