spi: rspi: Add support for multiple native chip selects (9815ed87) · Commits · 戴 / test

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>

drivers/spi/spi-rspi.c

+4 −1

Original line number	Diff line number	Diff line
		@@ -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)

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