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| author | Andrey Smirnov <andrew.smirnov@gmail.com> | 2017-03-08 14:09:07 -0800 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2017-03-09 11:51:28 +0100 |
| commit | dd0f42879ba7954ade946fe4d64f5ff0aaeb17b3 (patch) | |
| tree | 0753533488be15d67975d1ece45add9cc40086e8 /drivers/spi | |
| parent | d5f52220e60dbd2ce0c39ba53b783a0a1c438470 (diff) | |
| download | barebox-dd0f42879ba7954ade946fe4d64f5ff0aaeb17b3.tar.gz barebox-dd0f42879ba7954ade946fe4d64f5ff0aaeb17b3.tar.xz | |
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>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/atmel_spi.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/spi/atmel_spi.c b/drivers/spi/atmel_spi.c index 3f2c527d14..67028e6ad4 100644 --- a/drivers/spi/atmel_spi.c +++ b/drivers/spi/atmel_spi.c @@ -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); |