[U-Boot] [PATCH v3] spi: tegra20: Add support for mode selection

[Mirza Krak]

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

Respect the mode passed in set_mode ops.

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

Changes in v3:
* Move mode selection to .set_mode ops from .claim_bus ops

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

 drivers/spi/tegra20_slink.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/spi/tegra20_slink.c b/drivers/spi/tegra20_slink.c
index fbb665b86f3f..08c644c2173a 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)
@@ -331,6 +336,22 @@ static int tegra30_spi_set_speed(struct udevice *bus, uint 
speed)
 static int tegra30_spi_set_mode(struct udevice *bus, uint mode)
 {
        struct tegra30_spi_priv *priv = dev_get_priv(bus);
+       struct spi_regs *regs = priv->regs;
+       u32 reg;
+
+       reg = readl(&regs->command);
+
+       /* 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);

        priv->mode = mode;
        debug("%s: regs=%p, mode=%d\n", __func__, priv->regs, priv->mode);
--
2.1.0

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