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spi: rspi: Add support for multiple native chip selects

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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>
This commit is contained in:
Geert Uytterhoeven 2020-01-02 14:38:21 +01:00 committed by Mark Brown
parent 8f2344fa7f
commit 9815ed8714
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 4 additions and 1 deletions
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5
drivers/spi/spi-rspi.c
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@ -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)