spi: mediatek: add tick_delay support

This patch support tick_delay setting, some users need use
high-speed spi speed, which can use tick_delay to tuning spi clk timing.

Signed-off-by: Mason Zhang <Mason.Zhang@mediatek.com>
Link: https://lore.kernel.org/r/20210713114048.29509-1-mason.zhang@mediatek.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi-mt65xx.c b/drivers/spi/spi-mt65xx.c
index 097625d7915e94e5edb9e06b822b0097e7504f26..b34fbc913fd62e053da1154841ada3cf1029a7b7 100644 (file)
--- a/drivers/spi/spi-mt65xx.c
+++ b/drivers/spi/spi-mt65xx.c
@@ -42,8 +42,9 @@
 #define SPI_CFG1_CS_IDLE_OFFSET           0
 #define SPI_CFG1_PACKET_LOOP_OFFSET       8
 #define SPI_CFG1_PACKET_LENGTH_OFFSET     16
-#define SPI_CFG1_GET_TICK_DLY_OFFSET      30
+#define SPI_CFG1_GET_TICK_DLY_OFFSET      29
 
+#define SPI_CFG1_GET_TICK_DLY_MASK        0xe0000000
 #define SPI_CFG1_CS_IDLE_MASK             0xff
 #define SPI_CFG1_PACKET_LOOP_MASK         0xff00
 #define SPI_CFG1_PACKET_LENGTH_MASK       0x3ff0000
@@ -152,6 +153,7 @@ static const struct mtk_spi_compatible mt6893_compat = {
  */
 static const struct mtk_chip_config mtk_default_chip_info = {
        .sample_sel = 0,
+       .tick_delay = 0,
 };
 
 static const struct of_device_id mtk_spi_of_match[] = {
@@ -275,6 +277,13 @@ static int mtk_spi_prepare_message(struct spi_master *master,
                writel(mdata->pad_sel[spi->chip_select],
                       mdata->base + SPI_PAD_SEL_REG);
 
+       /* tick delay */
+       reg_val = readl(mdata->base + SPI_CFG1_REG);
+       reg_val &= ~SPI_CFG1_GET_TICK_DLY_MASK;
+       reg_val |= ((chip_config->tick_delay & 0x7)
+               << SPI_CFG1_GET_TICK_DLY_OFFSET);
+       writel(reg_val, mdata->base + SPI_CFG1_REG);
+
        return 0;
 }
 

diff --git a/include/linux/platform_data/spi-mt65xx.h b/include/linux/platform_data/spi-mt65xx.h
index 65fd5ffd257c00f6ce6129fe7d34b39c4f2497d1..f0db674f07b8a724ca5fe6732c64007e48298571 100644 (file)
--- a/include/linux/platform_data/spi-mt65xx.h
+++ b/include/linux/platform_data/spi-mt65xx.h
@@ -12,5 +12,6 @@
 /* Board specific platform_data */
 struct mtk_chip_config {
        u32 sample_sel;
+       u32 tick_delay;
 };
 #endif