the atmel_spi use only gpio for chip select

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagn...@jcrosoft.com>
Cc: devicetree-disc...@lists.ozlabs.org
Cc: spi-devel-general@lists.sourceforge.net
---
 .../devicetree/bindings/spi/spi_atmel.txt          |    6 ++++++
 drivers/spi/spi-atmel.c                            |   13 ++++++++++++-
 2 files changed, 18 insertions(+), 1 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/spi/spi_atmel.txt

diff --git a/Documentation/devicetree/bindings/spi/spi_atmel.txt 
b/Documentation/devicetree/bindings/spi/spi_atmel.txt
new file mode 100644
index 0000000..7ec3d8d
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/spi_atmel.txt
@@ -0,0 +1,6 @@
+Atmel SPI device
+
+Required properties:
+- compatible : should be "atmel,at91rm9200-spi".
+- reg: Address and length of the register set for the device
+- interrupts: Should contain macb interrupt
diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
index 16d6a83..beeaa26 100644
--- a/drivers/spi/spi-atmel.c
+++ b/drivers/spi/spi-atmel.c
@@ -19,6 +19,7 @@
 #include <linux/interrupt.h>
 #include <linux/spi/spi.h>
 #include <linux/slab.h>
+#include <linux/of.h>
 
 #include <asm/io.h>
 #include <mach/board.h>
@@ -937,8 +938,9 @@ static int __devinit atmel_spi_probe(struct platform_device 
*pdev)
        /* the spi->mode bits understood by this driver: */
        master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
 
+       master->dev.of_node = pdev->dev.of_node;
        master->bus_num = pdev->id;
-       master->num_chipselect = 4;
+       master->num_chipselect = master->dev.of_node ? 0 : 4;
        master->setup = atmel_spi_setup;
        master->transfer = atmel_spi_transfer;
        master->cleanup = atmel_spi_cleanup;
@@ -1064,11 +1066,20 @@ static int atmel_spi_resume(struct platform_device 
*pdev)
 #define        atmel_spi_resume        NULL
 #endif
 
+#if defined(CONFIG_OF)
+static const struct of_device_id atmel_spi_dt_ids[] = {
+       { .compatible = "atmel,at91rm9200-spi" },
+       { /* sentinel */ }
+};
+
+MODULE_DEVICE_TABLE(of, atmel_spi_dt_ids);
+#endif
 
 static struct platform_driver atmel_spi_driver = {
        .driver         = {
                .name   = "atmel_spi",
                .owner  = THIS_MODULE,
+               .of_match_table = of_match_ptr(atmel_spi_dt_ids),
        },
        .suspend        = atmel_spi_suspend,
        .resume         = atmel_spi_resume,
-- 
1.7.7


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