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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>
This commit is contained in:
Geert Uytterhoeven 2020-01-02 14:38:22 +01:00 committed by Mark Brown
parent 9815ed8714
commit 144d8f9781
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 8 additions and 1 deletions
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9
drivers/spi/spi-rspi.c
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@ -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) {