[PATCH 2/3] spi: lpspi: add multi SS support in PIO mode

[Clark Wang]

Add "fsl,spi-num-chipselects" check to support multi SS function in PIO
mode.

Signed-off-by: Clark Wang <xiaoning.w...@nxp.com>
Acked-by: Fugang Duan <fugang.d...@nxp.com>
---
 drivers/spi/spi-fsl-lpspi.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-fsl-lpspi.c b/drivers/spi/spi-fsl-lpspi.c
index 19040b5ef349..a8e83cb96f61 100644
--- a/drivers/spi/spi-fsl-lpspi.c
+++ b/drivers/spi/spi-fsl-lpspi.c
@@ -841,7 +841,7 @@ static int fsl_lpspi_probe(struct platform_device *pdev)
        struct spi_imx_master *lpspi_platform_info =
                dev_get_platdata(&pdev->dev);
        struct resource *res;
-       int i, ret, irq;
+       int i, ret, irq, num_cs;
        u32 temp;
        bool is_slave;
 
@@ -863,6 +863,16 @@ static int fsl_lpspi_probe(struct platform_device *pdev)
 
        platform_set_drvdata(pdev, controller);
 
+       ret = of_property_read_u32(np, "fsl,spi-num-chipselects", &num_cs);
+       if (ret < 0) {
+               if (lpspi_platform_info) {
+                       num_cs = lpspi_platform_info->num_chipselect;
+                       controller->num_chipselect = num_cs;
+               }
+       } else {
+               controller->num_chipselect = num_cs;
+       }
+
        fsl_lpspi = spi_controller_get_devdata(controller);
        fsl_lpspi->dev = &pdev->dev;
        fsl_lpspi->is_slave = is_slave;
-- 
2.17.1