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Subject[PATCH 5/6] spi: rspi: Add support for multiple native chip selects
Date
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>
---
drivers/spi/spi-rspi.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c
index 9eabef3d6cc478ff..2f5a856a93192702 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)
--
2.17.1
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