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authorGeert Uytterhoeven <geert+renesas@glider.be>2020-01-02 14:38:22 +0100
committerMark Brown <broonie@kernel.org>2020-01-07 22:34:07 +0000
commit144d8f9781e60d89dfd614210d2cedbefbba8885 (patch)
treea75c448e6588c7edeafc30a7fb81d286f8119444 /drivers/spi/spi-rspi.c
parent9815ed8714d26560d09b41f906b96a97f9bc3e3f (diff)
spi: rspi: Add support for GPIO chip selects
Add support for GPIO chip selects using GPIO descriptors. As the RSPI controller always drives a native chip select when performing a transfer, at least one native chip select must be left unused. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Link: https://lore.kernel.org/r/20200102133822.29346-7-geert+renesas@glider.be Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-rspi.c')
-rw-r--r--drivers/spi/spi-rspi.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c
index 2f5a856a9319..85575d45901c 100644
--- a/drivers/spi/spi-rspi.c
+++ b/drivers/spi/spi-rspi.c
@@ -242,6 +242,7 @@ struct spi_ops {
u16 mode_bits;
u16 flags;
u16 fifo_size;
+ u8 num_hw_ss;
};
/*
@@ -934,7 +935,8 @@ static int rspi_prepare_message(struct spi_controller *ctlr,
rspi->spcmd |= SPCMD_CPHA;
/* Configure slave signal to assert */
- rspi->spcmd |= SPCMD_SSLA(spi->chip_select);
+ rspi->spcmd |= SPCMD_SSLA(spi->cs_gpiod ? rspi->ctlr->unused_native_cs
+ : spi->chip_select);
/* CMOS output mode and MOSI signal from previous transfer */
rspi->sppcr = 0;
@@ -1123,6 +1125,7 @@ static const struct spi_ops rspi_ops = {
.mode_bits = SPI_CPHA | SPI_CPOL | SPI_LOOP,
.flags = SPI_CONTROLLER_MUST_TX,
.fifo_size = 8,
+ .num_hw_ss = 2,
};
static const struct spi_ops rspi_rz_ops = {
@@ -1131,6 +1134,7 @@ static const struct spi_ops rspi_rz_ops = {
.mode_bits = SPI_CPHA | SPI_CPOL | SPI_LOOP,
.flags = SPI_CONTROLLER_MUST_RX | SPI_CONTROLLER_MUST_TX,
.fifo_size = 8, /* 8 for TX, 32 for RX */
+ .num_hw_ss = 1,
};
static const struct spi_ops qspi_ops = {
@@ -1141,6 +1145,7 @@ static const struct spi_ops qspi_ops = {
SPI_RX_DUAL | SPI_RX_QUAD,
.flags = SPI_CONTROLLER_MUST_RX | SPI_CONTROLLER_MUST_TX,
.fifo_size = 32,
+ .num_hw_ss = 1,
};
#ifdef CONFIG_OF
@@ -1256,6 +1261,8 @@ static int rspi_probe(struct platform_device *pdev)
ctlr->mode_bits = ops->mode_bits;
ctlr->flags = ops->flags;
ctlr->dev.of_node = pdev->dev.of_node;
+ ctlr->use_gpio_descriptors = true;
+ ctlr->max_native_cs = rspi->ops->num_hw_ss;
ret = platform_get_irq_byname_optional(pdev, "rx");
if (ret < 0) {