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 <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

drivers/spi/spi-mt65xx.c

···
 #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
···
  */
 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[] = {
···
 	if (mdata->dev_comp->need_pad_sel)
 		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;
 }

include/linux/platform_data/spi-mt65xx.h

···
 /* Board specific platform_data */
 struct mtk_chip_config {
 	u32 sample_sel;
+	u32 tick_delay;
 };
 #endif