linux-kernel - [PATCH v8 6/6] spi: rockchip: Support SPI_CS

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Date:   Tue, 15 Jun 2021 11:32:52 +0800
From:   Jon Lin <jon.lin@...k-chips.com>
To:     broonie@...nel.org
Cc:     jon.lin@...k-chips.com, heiko@...ech.de, robh+dt@...nel.org,
        linux-spi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: [PATCH v8 6/6] spi: rockchip: Support SPI_CS_HIGH

1.Add standard spi-cs-high support
2.Refer to spi-controller.yaml for details

Signed-off-by: Jon Lin <jon.lin@...k-chips.com>
---

Changes in v8: None
Changes in v7: None
Changes in v6: None
Changes in v5: None
Changes in v4: None
Changes in v3: None

 drivers/spi/spi-rockchip.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c
index 48b666d42d8a..d64cca34eef7 100644
--- a/drivers/spi/spi-rockchip.c
+++ b/drivers/spi/spi-rockchip.c
@@ -108,6 +108,8 @@
 #define CR0_OPM_MASTER				0x0
 #define CR0_OPM_SLAVE				0x1
 
+#define CR0_SOI_OFFSET				23
+
 #define CR0_MTM_OFFSET				0x21
 
 /* Bit fields in SER, 2bit */
@@ -238,7 +240,7 @@ static void rockchip_spi_set_cs(struct spi_device *spi, bool enable)
 {
 	struct spi_controller *ctlr = spi->controller;
 	struct rockchip_spi *rs = spi_controller_get_devdata(ctlr);
-	bool cs_asserted = !enable;
+	bool cs_asserted = spi->mode & SPI_CS_HIGH ? enable : !enable;
 
 	/* Return immediately for no-op */
 	if (cs_asserted == rs->cs_asserted[spi->chip_select])
@@ -509,6 +511,8 @@ static int rockchip_spi_config(struct rockchip_spi *rs,
 	cr0 |= (spi->mode & 0x3U) << CR0_SCPH_OFFSET;
 	if (spi->mode & SPI_LSB_FIRST)
 		cr0 |= CR0_FBM_LSB << CR0_FBM_OFFSET;
+	if (spi->mode & SPI_CS_HIGH)
+		cr0 |= BIT(spi->chip_select) << CR0_SOI_OFFSET;
 
 	if (xfer->rx_buf && xfer->tx_buf)
 		cr0 |= CR0_XFM_TR << CR0_XFM_OFFSET;
@@ -787,7 +791,7 @@ static int rockchip_spi_probe(struct platform_device *pdev)
 
 	ctlr->auto_runtime_pm = true;
 	ctlr->bus_num = pdev->id;
-	ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LOOP | SPI_LSB_FIRST;
+	ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LOOP | SPI_LSB_FIRST | SPI_CS_HIGH;
 	if (slave_mode) {
 		ctlr->mode_bits |= SPI_NO_CS;
 		ctlr->slave_abort = rockchip_spi_slave_abort;
-- 
2.17.1