spi: davinci: fix to support more than 2 chip selects

Currently, the driver defines SPI_MAX_CHIPSELECT as 2 and
use per device array bytes_per_word based on this. This breaks
if num_chipselect per device is greater than 2. This patch
fix this and allocate memory for this array based on
num_chipselect.

It's preparation patch to enable GPIO CS feature for
Davinci SPI.

Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

diff --git a/drivers/spi/spi-davinci.c b/drivers/spi/spi-davinci.c
index 50f7509..2477af4 100644 (file)
--- a/drivers/spi/spi-davinci.c
+++ b/drivers/spi/spi-davinci.c
@@ -38,8 +38,6 @@
 
 #define SPI_NO_RESOURCE                ((resource_size_t)-1)
 
-#define SPI_MAX_CHIPSELECT     2
-
 #define CS_DEFAULT     0xFF
 
 #define SPIFMT_PHASE_MASK      BIT(16)
@@ -142,7 +140,7 @@ struct davinci_spi {
        void                    (*get_rx)(u32 rx_data, struct davinci_spi *);
        u32                     (*get_tx)(struct davinci_spi *);
 
-       u8                      bytes_per_word[SPI_MAX_CHIPSELECT];
+       u8                      *bytes_per_word;
 };
 
 static struct davinci_spi_config davinci_spi_default_cfg;
@@ -876,6 +874,14 @@ static int davinci_spi_probe(struct platform_device *pdev)
        /* pdata in dspi is now updated and point pdata to that */
        pdata = &dspi->pdata;
 
+       dspi->bytes_per_word = devm_kzalloc(&pdev->dev,
+                                           sizeof(*dspi->bytes_per_word) *
+                                           pdata->num_chipselect, GFP_KERNEL);
+       if (dspi->bytes_per_word == NULL) {
+               ret = -ENOMEM;
+               goto free_master;
+       }
+
        r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        if (r == NULL) {
                ret = -ENOENT;