spi: spi-fsl-lpspi: support multiple cs for lpspi

support to get chip select number from DT file.

Signed-off-by: Han Xu <han.xu@nxp.com>
Link: https://lore.kernel.org/r/20221206225410.604482-1-han.xu@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi-fsl-lpspi.c b/drivers/spi/spi-fsl-lpspi.c
index e8c1c8a4c6c82f509cffce8fc924b627a8c33458..34488de55587139df47a3631079273f64df219bf 100644 (file)
--- a/drivers/spi/spi-fsl-lpspi.c
+++ b/drivers/spi/spi-fsl-lpspi.c
@@ -98,6 +98,7 @@ struct fsl_lpspi_data {
        struct clk *clk_ipg;
        struct clk *clk_per;
        bool is_slave;
+       u32 num_cs;
        bool is_only_cs1;
        bool is_first_byte;
 
@@ -840,6 +841,9 @@ static int fsl_lpspi_probe(struct platform_device *pdev)
        fsl_lpspi->is_slave = is_slave;
        fsl_lpspi->is_only_cs1 = of_property_read_bool((&pdev->dev)->of_node,
                                                "fsl,spi-only-use-cs1-sel");
+       if (of_property_read_u32((&pdev->dev)->of_node, "num-cs",
+                                &fsl_lpspi->num_cs))
+               fsl_lpspi->num_cs = 1;
 
        controller->bits_per_word_mask = SPI_BPW_RANGE_MASK(8, 32);
        controller->transfer_one = fsl_lpspi_transfer_one;
@@ -849,6 +853,7 @@ static int fsl_lpspi_probe(struct platform_device *pdev)
        controller->flags = SPI_MASTER_MUST_RX | SPI_MASTER_MUST_TX;
        controller->dev.of_node = pdev->dev.of_node;
        controller->bus_num = pdev->id;
+       controller->num_chipselect = fsl_lpspi->num_cs;
        controller->slave_abort = fsl_lpspi_slave_abort;
        if (!fsl_lpspi->is_slave)
                controller->use_gpio_descriptors = true;