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authorRadu Pirea (NXP OSS)2022-11-11 23:13:56 +0200
committerMark Brown2022-11-16 14:46:07 +0000
commit84b60f2bce1f0416617c4dbc015b5da906b8e2ad (patch)
tree21d997bfede7659699a8f63bc6299a0e7766c066 /drivers/spi
parentd52a826b40604387d3e24b54e12e404867902fbb (diff)
spi: fsl-dspi: add cs-gpios support
Make the driver be able to bit-bang a GPIO for the Chip Select pin of select peripherals. The GPIO value is driven by the driver in that case, and none of the hardware Chip Select bits will be populated in the PUSHR register for the TX commands constructed for this peripheral. Signed-off-by: Radu Pirea (NXP OSS) <radu-nicolae.pirea@oss.nxp.com> Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Link: https://lore.kernel.org/r/20221111211356.545026-1-vladimir.oltean@nxp.com Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/spi-fsl-dspi.c36
1 files changed, 34 insertions, 2 deletions
diff --git a/drivers/spi/spi-fsl-dspi.c b/drivers/spi/spi-fsl-dspi.c
index a33e547b7d39..e419642eb10e 100644
--- a/drivers/spi/spi-fsl-dspi.c
+++ b/drivers/spi/spi-fsl-dspi.c
@@ -900,12 +900,31 @@ static irqreturn_t dspi_interrupt(int irq, void *dev_id)
return IRQ_HANDLED;
}
+static void dspi_assert_cs(struct spi_device *spi, bool *cs)
+{
+ if (!spi->cs_gpiod || *cs)
+ return;
+
+ gpiod_set_value_cansleep(spi->cs_gpiod, true);
+ *cs = true;
+}
+
+static void dspi_deassert_cs(struct spi_device *spi, bool *cs)
+{
+ if (!spi->cs_gpiod || !*cs)
+ return;
+
+ gpiod_set_value_cansleep(spi->cs_gpiod, false);
+ *cs = false;
+}
+
static int dspi_transfer_one_message(struct spi_controller *ctlr,
struct spi_message *message)
{
struct fsl_dspi *dspi = spi_controller_get_devdata(ctlr);
struct spi_device *spi = message->spi;
struct spi_transfer *transfer;
+ bool cs = false;
int status = 0;
message->actual_length = 0;
@@ -914,9 +933,14 @@ static int dspi_transfer_one_message(struct spi_controller *ctlr,
dspi->cur_transfer = transfer;
dspi->cur_msg = message;
dspi->cur_chip = spi_get_ctldata(spi);
+
+ dspi_assert_cs(spi, &cs);
+
/* Prepare command word for CMD FIFO */
- dspi->tx_cmd = SPI_PUSHR_CMD_CTAS(0) |
- SPI_PUSHR_CMD_PCS(spi->chip_select);
+ dspi->tx_cmd = SPI_PUSHR_CMD_CTAS(0);
+ if (!spi->cs_gpiod)
+ dspi->tx_cmd |= SPI_PUSHR_CMD_PCS(spi->chip_select);
+
if (list_is_last(&dspi->cur_transfer->transfer_list,
&dspi->cur_msg->transfers)) {
/* Leave PCS activated after last transfer when
@@ -964,6 +988,9 @@ static int dspi_transfer_one_message(struct spi_controller *ctlr,
break;
spi_transfer_delay_exec(transfer);
+
+ if (!(dspi->tx_cmd & SPI_PUSHR_CMD_CONT))
+ dspi_deassert_cs(spi, &cs);
}
message->status = status;
@@ -981,6 +1008,7 @@ static int dspi_setup(struct spi_device *spi)
unsigned char pasc = 0, asc = 0;
struct chip_data *chip;
unsigned long clkrate;
+ bool cs = true;
/* Only alloc on first setup */
chip = spi_get_ctldata(spi);
@@ -1030,6 +1058,9 @@ static int dspi_setup(struct spi_device *spi)
chip->ctar_val |= SPI_CTAR_LSBFE;
}
+ gpiod_direction_output(spi->cs_gpiod, false);
+ dspi_deassert_cs(spi, &cs);
+
spi_set_ctldata(spi, chip);
return 0;
@@ -1248,6 +1279,7 @@ static int dspi_probe(struct platform_device *pdev)
ctlr->cleanup = dspi_cleanup;
ctlr->slave_abort = dspi_slave_abort;
ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST;
+ ctlr->use_gpio_descriptors = true;
pdata = dev_get_platdata(&pdev->dev);
if (pdata) {