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    Subject[PATCH 6/6] spi: rspi: Add support for GPIO chip selects
    Date
    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>
    ---
    drivers/spi/spi-rspi.c | 9 ++++++++-
    1 file changed, 8 insertions(+), 1 deletion(-)

    diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c
    index 2f5a856a93192702..85575d45901cee1b 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) {
    --
    2.17.1
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