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Subject[PATCH] spi: dw: support 4-16 bits per word
Date
The spi-dw driver currently only supports 8 or 16 bits per word.

Since the hardware supports 4-16 bits per word, adapt the driver
to also support this.

Tested on socfpga cyclone5 with a 9-bit SPI display.

Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
---
drivers/spi/spi-dw.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c
index f693bfe95ab9..2ecbb6b19cea 100644
--- a/drivers/spi/spi-dw.c
+++ b/drivers/spi/spi-dw.c
@@ -307,14 +307,14 @@ static int dw_spi_transfer_one(struct spi_controller *master,
dws->current_freq = transfer->speed_hz;
spi_set_clk(dws, chip->clk_div);
}
- if (transfer->bits_per_word == 8) {
+ if ((transfer->bits_per_word < 4) || (transfer->bits_per_word > 16))
+ return -EINVAL;
+ if (transfer->bits_per_word <= 8) {
dws->n_bytes = 1;
dws->dma_width = 1;
- } else if (transfer->bits_per_word == 16) {
+ } else {
dws->n_bytes = 2;
dws->dma_width = 2;
- } else {
- return -EINVAL;
}
/* Default SPI mode is SCPOL = 0, SCPH = 0 */
cr0 = (transfer->bits_per_word - 1)
@@ -493,7 +493,7 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws)
}

master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LOOP;
- master->bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(16);
+ master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 16);
master->bus_num = dws->bus_num;
master->num_chipselect = dws->num_cs;
master->setup = dw_spi_setup;
--
2.17.1
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