[U-Boot] [PATCH v2] spi: tegra20: Add support for mode selection

[Mirza Krak]

From: Mirza Krak <mirza.k...@hostmobility.com>

Respect the mode passed in claim_bus call.

Signed-off-by: Mirza Krak <mirza.k...@hostmobility.com>
---

Changes in v2:
* Refactor clearing the CPOL and CPHA bits. Based on comments from Jagan Teki.

 drivers/spi/tegra20_slink.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/spi/tegra20_slink.c b/drivers/spi/tegra20_slink.c
index fbb665b86f3f..fa39dea2daf1 100644
--- a/drivers/spi/tegra20_slink.c
+++ b/drivers/spi/tegra20_slink.c
@@ -36,6 +36,11 @@ DECLARE_GLOBAL_DATA_PTR;
 #define SLINK_CMD_ENB                  (1 << 31)
 #define SLINK_CMD_GO                   (1 << 30)
 #define SLINK_CMD_M_S                  (1 << 28)
+#define SLINK_CMD_IDLE_SCLK_DRIVE_LOW          (0 << 24)
+#define SLINK_CMD_IDLE_SCLK_DRIVE_HIGH         (1 << 24)
+#define SLINK_CMD_IDLE_SCLK_PULL_LOW           (2 << 24)
+#define SLINK_CMD_IDLE_SCLK_PULL_HIGH          (3 << 24)
+#define SLINK_CMD_IDLE_SCLK_MASK                       (3 << 24)
 #define SLINK_CMD_CK_SDA               (1 << 21)
 #define SLINK_CMD_CS_POL               (1 << 13)
 #define SLINK_CMD_CS_VAL               (1 << 12)
@@ -146,6 +151,7 @@ static int tegra30_spi_claim_bus(struct udevice *dev)
        struct udevice *bus = dev->parent;
        struct tegra30_spi_priv *priv = dev_get_priv(bus);
        struct spi_regs *regs = priv->regs;
+       unsigned int mode = priv->mode;
        u32 reg;

        /* Change SPI clock to correct frequency, PLLP_OUT0 source */
@@ -161,6 +167,17 @@ static int tegra30_spi_claim_bus(struct udevice *dev)
        /* Set master mode and sw controlled CS */
        reg = readl(&regs->command);
        reg |= SLINK_CMD_M_S | SLINK_CMD_CS_SOFT;
+
+       /* Set CPOL and CPHA */
+       reg &= ~(SLINK_CMD_IDLE_SCLK_MASK | SLINK_CMD_CK_SDA);
+       if (mode & SPI_CPHA)
+               reg |= SLINK_CMD_CK_SDA;
+
+       if (mode & SPI_CPOL)
+               reg |= SLINK_CMD_IDLE_SCLK_DRIVE_HIGH;
+       else
+               reg |= SLINK_CMD_IDLE_SCLK_DRIVE_LOW;
+
        writel(reg, &regs->command);
        debug("%s: COMMAND = %08x\n", __func__, readl(&regs->command));

--
2.1.0

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