[PATCH 1/2] spi: mediatek: add SPI_CS_HIGH support

From: Luhua Xu
Date: Sun Nov 17 2019 - 23:58:15 EST


Change to use SPI_CS_HIGH to support spi CS polarity setting
for chips support enhance_timing.

Signed-off-by: Luhua Xu <luhua.xu@xxxxxxxxxxxx>
---
drivers/spi/spi-mt65xx.c | 12 ++++++++++--
include/linux/platform_data/spi-mt65xx.h | 1 -
2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/spi/spi-mt65xx.c b/drivers/spi/spi-mt65xx.c
index 6888a4d..f599cce 100644
--- a/drivers/spi/spi-mt65xx.c
+++ b/drivers/spi/spi-mt65xx.c
@@ -139,7 +139,6 @@ static const struct mtk_spi_compatible mt8183_compat = {
* supplies it.
*/
static const struct mtk_chip_config mtk_default_chip_info = {
- .cs_pol = 0,
.sample_sel = 0,
};

@@ -230,10 +229,12 @@ static int mtk_spi_prepare_message(struct spi_master *master,
#endif

if (mdata->dev_comp->enhance_timing) {
- if (chip_config->cs_pol)
+ /* set CS polarity */
+ if (spi->mode & SPI_CS_HIGH)
reg_val |= SPI_CMD_CS_POL;
else
reg_val &= ~SPI_CMD_CS_POL;
+
if (chip_config->sample_sel)
reg_val |= SPI_CMD_SAMPLE_SEL;
else
@@ -264,6 +265,9 @@ static void mtk_spi_set_cs(struct spi_device *spi, bool enable)
u32 reg_val;
struct mtk_spi *mdata = spi_master_get_devdata(spi->master);

+ if (spi->mode & SPI_CS_HIGH)
+ enable = !enable;
+
reg_val = readl(mdata->base + SPI_CMD_REG);
if (!enable) {
reg_val |= SPI_CMD_PAUSE_EN;
@@ -647,6 +651,10 @@ static int mtk_spi_probe(struct platform_device *pdev)

mdata = spi_master_get_devdata(master);
mdata->dev_comp = of_id->data;
+
+ if (mdata->dev_comp->enhance_timing)
+ master->mode_bits |= SPI_CS_HIGH;
+
if (mdata->dev_comp->must_tx)
master->flags = SPI_MASTER_MUST_TX;

diff --git a/include/linux/platform_data/spi-mt65xx.h b/include/linux/platform_data/spi-mt65xx.h
index f0e6d64..65fd5ffd2 100644
--- a/include/linux/platform_data/spi-mt65xx.h
+++ b/include/linux/platform_data/spi-mt65xx.h
@@ -11,7 +11,6 @@

/* Board specific platform_data */
struct mtk_chip_config {
- u32 cs_pol;
u32 sample_sel;
};
#endif
--
2.6.4