linux-kernel - [PATCH 5/6] spi: rspi: Add support for multiple native chip selects

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Date:   Thu,  2 Jan 2020 14:38:21 +0100
From:   Geert Uytterhoeven <geert+renesas@...der.be>
To:     Mark Brown <broonie@...nel.org>
Cc:     Chris Brandt <chris.brandt@...esas.com>,
        Jan Kundrát <jan.kundrat@...net.cz>,
        linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH 5/6] 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@...der.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