1 files changed, 26 insertions, 11 deletions

diff --git a/drivers/spi/spi-gpio.c b/drivers/spi/spi-gpio.c
index 9f595535cf27..4b600d4f8548 100644
--- a/drivers/spi/spi-gpio.c
+++ b/drivers/spi/spi-gpio.c
@@ -48,7 +48,7 @@ struct spi_gpio {
         struct spi_bitbang              bitbang;
         struct spi_gpio_platform_data   pdata;
         struct platform_device          *pdev;
-        int                             cs_gpios[0];
+        unsigned long                   cs_gpios[0];
 };
 
 /*----------------------------------------------------------------------*/
@@ -220,7 +220,7 @@ static u32 spi_gpio_spec_txrx_word_mode3(struct spi_device *spi,
 static void spi_gpio_chipselect(struct spi_device *spi, int is_active)
 {
         struct spi_gpio *spi_gpio = spi_to_spi_gpio(spi);
-        unsigned int cs = spi_gpio->cs_gpios[spi->chip_select];
+        unsigned long cs = spi_gpio->cs_gpios[spi->chip_select];
 
         /* set initial clock polarity */
         if (is_active)
@@ -234,7 +234,7 @@ static void spi_gpio_chipselect(struct spi_device *spi, int is_active)
 
 static int spi_gpio_setup(struct spi_device *spi)
 {
-        unsigned int            cs;
+        unsigned long           cs;
         int                     status = 0;
         struct spi_gpio         *spi_gpio = spi_to_spi_gpio(spi);
         struct device_node      *np = spi->master->dev.of_node;
@@ -249,7 +249,7 @@ static int spi_gpio_setup(struct spi_device *spi)
                 /*
                  * ... otherwise, take it from spi->controller_data
                  */
-                cs = (unsigned int)(uintptr_t) spi->controller_data;
+                cs = (uintptr_t) spi->controller_data;
         }
 
         if (!spi->controller_state) {
@@ -277,7 +277,7 @@ static int spi_gpio_setup(struct spi_device *spi)
 static void spi_gpio_cleanup(struct spi_device *spi)
 {
         struct spi_gpio *spi_gpio = spi_to_spi_gpio(spi);
-        unsigned int cs = spi_gpio->cs_gpios[spi->chip_select];
+        unsigned long cs = spi_gpio->cs_gpios[spi->chip_select];
 
         if (cs != SPI_GPIO_NO_CHIPSELECT)
                 gpio_free(cs);
@@ -413,6 +413,7 @@ static int spi_gpio_probe(struct platform_device *pdev)
         struct spi_gpio_platform_data   *pdata;
         u16 master_flags = 0;
         bool use_of = 0;
+        int num_devices;
 
         status = spi_gpio_probe_dt(pdev);
         if (status < 0)
@@ -422,16 +423,21 @@ static int spi_gpio_probe(struct platform_device *pdev)
 
         pdata = dev_get_platdata(&pdev->dev);
 #ifdef GENERIC_BITBANG
-        if (!pdata || !pdata->num_chipselect)
+        if (!pdata || (!use_of && !pdata->num_chipselect))
                 return -ENODEV;
 #endif
 
+        if (use_of && !SPI_N_CHIPSEL)
+                num_devices = 1;
+        else
+                num_devices = SPI_N_CHIPSEL;
+
         status = spi_gpio_request(pdata, dev_name(&pdev->dev), &master_flags);
         if (status < 0)
                 return status;
 
         master = spi_alloc_master(&pdev->dev, sizeof(*spi_gpio) +
-                                        (sizeof(int) * SPI_N_CHIPSEL));
+                                        (sizeof(unsigned long) * num_devices));
         if (!master) {
                 status = -ENOMEM;
                 goto gpio_free;
@@ -446,7 +452,7 @@ static int spi_gpio_probe(struct platform_device *pdev)
         master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32);
         master->flags = master_flags;
         master->bus_num = pdev->id;
-        master->num_chipselect = SPI_N_CHIPSEL;
+        master->num_chipselect = num_devices;
         master->setup = spi_gpio_setup;
         master->cleanup = spi_gpio_cleanup;
 #ifdef CONFIG_OF
@@ -461,9 +467,18 @@ static int spi_gpio_probe(struct platform_device *pdev)
                  * property of the node.
                  */
 
-                for (i = 0; i < SPI_N_CHIPSEL; i++)
-                        spi_gpio->cs_gpios[i] =
-                                of_get_named_gpio(np, "cs-gpios", i);
+                if (!SPI_N_CHIPSEL)
+                        spi_gpio->cs_gpios[0] = SPI_GPIO_NO_CHIPSELECT;
+                else
+                        for (i = 0; i < SPI_N_CHIPSEL; i++) {
+                                status = of_get_named_gpio(np, "cs-gpios", i);
+                                if (status < 0) {
+                                        dev_err(&pdev->dev,
+                                                "invalid cs-gpios property\n");
+                                        goto gpio_free;
+                                }
+                                spi_gpio->cs_gpios[i] = status;
+                        }
         }
 #endif