[PATCH] spi: mediatek: add SPI_LSB_FIRST support

From: Leilk Liu
Date: Tue Jun 04 2019 - 23:07:04 EST


this patch add SPI_LSB_FIRST feature support.

Signed-off-by: Leilk Liu <leilk.liu@xxxxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
---
drivers/spi/spi-mt65xx.c | 15 ++++++---------
include/linux/platform_data/spi-mt65xx.h | 2 --
2 files changed, 6 insertions(+), 11 deletions(-)

diff --git a/drivers/spi/spi-mt65xx.c b/drivers/spi/spi-mt65xx.c
index 0cce6f0ba824..7f4dc1844789 100644
--- a/drivers/spi/spi-mt65xx.c
+++ b/drivers/spi/spi-mt65xx.c
@@ -131,8 +131,6 @@ static const struct mtk_spi_compatible mt8183_compat = {
* supplies it.
*/
static const struct mtk_chip_config mtk_default_chip_info = {
- .rx_mlsb = 1,
- .tx_mlsb = 1,
.cs_pol = 0,
.sample_sel = 0,
};
@@ -203,14 +201,13 @@ static int mtk_spi_prepare_message(struct spi_master *master,
reg_val &= ~SPI_CMD_CPOL;

/* set the mlsbx and mlsbtx */
- if (chip_config->tx_mlsb)
- reg_val |= SPI_CMD_TXMSBF;
- else
+ if (spi->mode & SPI_LSB_FIRST) {
reg_val &= ~SPI_CMD_TXMSBF;
- if (chip_config->rx_mlsb)
- reg_val |= SPI_CMD_RXMSBF;
- else
reg_val &= ~SPI_CMD_RXMSBF;
+ } else {
+ reg_val |= SPI_CMD_TXMSBF;
+ reg_val |= SPI_CMD_RXMSBF;
+ }

/* set the tx/rx endian */
#ifdef __LITTLE_ENDIAN
@@ -607,7 +604,7 @@ static int mtk_spi_probe(struct platform_device *pdev)

master->auto_runtime_pm = true;
master->dev.of_node = pdev->dev.of_node;
- master->mode_bits = SPI_CPOL | SPI_CPHA;
+ master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST;

master->set_cs = mtk_spi_set_cs;
master->prepare_message = mtk_spi_prepare_message;
diff --git a/include/linux/platform_data/spi-mt65xx.h b/include/linux/platform_data/spi-mt65xx.h
index ba4e4bb70262..8d5df58a13ef 100644
--- a/include/linux/platform_data/spi-mt65xx.h
+++ b/include/linux/platform_data/spi-mt65xx.h
@@ -14,8 +14,6 @@

/* Board specific platform_data */
struct mtk_chip_config {
- u32 tx_mlsb;
- u32 rx_mlsb;
u32 cs_pol;
u32 sample_sel;
};
--
2.20.1