spi: rspi: Add support for specifying CPHA/CPOL

Add support for specifying the SPI clock phase and polarity, based on the
SDK reference code.

Signed-off-by: Geert Uytterhoeven <geert+renesas@linux-m68k.org>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

1 files changed, 10 insertions, 2 deletions

diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c
index 4a2c7592b5eb..c3227fb44b03 100644
--- a/drivers/spi/spi-rspi.c
+++ b/drivers/spi/spi-rspi.c
@@ -187,6 +187,7 @@ struct rspi_data {
         spinlock_t lock;
         struct clk *clk;
         u8 spsr;
+        u16 spcmd;
         const struct spi_ops *ops;
 
         /* for dmaengine */
@@ -261,7 +262,7 @@ static int rspi_set_config_register(const struct rspi_data *rspi,
         rspi_write8(rspi, 0x00, RSPI_SPCR2);
 
         /* Sets SPCMD */
-        rspi_write16(rspi, SPCMD_SPB_8_TO_16(access_size) | SPCMD_SSLKP,
+        rspi_write16(rspi, SPCMD_SPB_8_TO_16(access_size) | rspi->spcmd,
                      RSPI_SPCMD0);
 
         /* Sets RSPI mode */
@@ -302,7 +303,7 @@ static int qspi_set_config_register(const struct rspi_data *rspi,
         else if (access_size == 32)
                 spcmd = SPCMD_SPB_32BIT;
 
-        spcmd |= SPCMD_SCKDEN | SPCMD_SLNDEN | SPCMD_SSLKP | SPCMD_SPNDEN;
+        spcmd |= SPCMD_SCKDEN | SPCMD_SLNDEN | rspi->spcmd | SPCMD_SPNDEN;
 
         /* Resets transfer data length */
         rspi_write32(rspi, 0, QSPI_SPBMUL0);
@@ -805,6 +806,12 @@ static int rspi_setup(struct spi_device *spi)
                 spi->bits_per_word = 8;
         rspi->max_speed_hz = spi->max_speed_hz;
 
+        rspi->spcmd = SPCMD_SSLKP;
+        if (spi->mode & SPI_CPOL)
+                rspi->spcmd |= SPCMD_CPOL;
+        if (spi->mode & SPI_CPHA)
+                rspi->spcmd |= SPCMD_CPHA;
+
         set_config_register(rspi, 8);
 
         return 0;
@@ -996,6 +1003,7 @@ static int rspi_probe(struct platform_device *pdev)
         master->setup = rspi_setup;
         master->transfer = rspi_transfer;
         master->cleanup = rspi_cleanup;
+        master->mode_bits = SPI_CPHA | SPI_CPOL;
 
         ret = request_irq(irq, rspi_irq, 0, dev_name(&pdev->dev), rspi);
         if (ret < 0) {