diff options
| author | Geert Uytterhoeven <geert+renesas@glider.be> | 2020-01-02 16:38:21 +0300 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2020-01-08 01:33:47 +0300 |
| commit | 9815ed8714d26560d09b41f906b96a97f9bc3e3f (patch) | |
| tree | 07ab9663123f440cd31f02c2f1191e163fc180e0 /drivers/spi/spi-rspi.c | |
| parent | 8f2344fa7f54382eeaf4b65d70c74b0b44df7a6b (diff) | |
| download | linux-9815ed8714d26560d09b41f906b96a97f9bc3e3f.tar.xz | |
spi: rspi: Add support for multiple native chip selects
RSPI variants on some SuperH or R-Mobile SoCs support multiple native
chip selects. Add support for this by configuring the SSL Assert Signal
Setting.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20200102133822.29346-6-geert+renesas@glider.be
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-rspi.c')
| -rw-r--r-- | drivers/spi/spi-rspi.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c index 9eabef3d6cc4..2f5a856a9319 100644 --- a/drivers/spi/spi-rspi.c +++ b/drivers/spi/spi-rspi.c @@ -159,7 +159,7 @@ #define SPCMD_SPIMOD_DUAL SPCMD_SPIMOD0 #define SPCMD_SPIMOD_QUAD SPCMD_SPIMOD1 #define SPCMD_SPRW 0x0010 /* SPI Read/Write Access (Dual/Quad) */ -#define SPCMD_SSLA_MASK 0x0030 /* SSL Assert Signal Setting (RSPI) */ +#define SPCMD_SSLA(i) ((i) << 4) /* SSL Assert Signal Setting */ #define SPCMD_BRDV_MASK 0x000c /* Bit Rate Division Setting */ #define SPCMD_CPOL 0x0002 /* Clock Polarity Setting */ #define SPCMD_CPHA 0x0001 /* Clock Phase Setting */ @@ -933,6 +933,9 @@ static int rspi_prepare_message(struct spi_controller *ctlr, if (spi->mode & SPI_CPHA) rspi->spcmd |= SPCMD_CPHA; + /* Configure slave signal to assert */ + rspi->spcmd |= SPCMD_SSLA(spi->chip_select); + /* CMOS output mode and MOSI signal from previous transfer */ rspi->sppcr = 0; if (spi->mode & SPI_LOOP) |