[PATCH v2] spi: dw-mmio: add oftree support

[Steffen Trumtrar]

Allow probing the dw-mmio from devicetree.

Signed-off-by: Steffen Trumtrar <s.trumtrar@xxxxxxxxxxxxxx>
---
Changes since v1:
	- num-chipselect -> num-cs
	- snps,dw-spi-mmio -> snps,dw-apb-ssi

 .../devicetree/bindings/spi/snps,dw-apb-ssi.txt    | 25 ++++++++++++++++++++++
 drivers/spi/spi-dw-mmio.c                          | 20 ++++++++++++++++-
 2 files changed, 44 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.txt

diff --git a/Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.txt b/Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.txt
new file mode 100644
index 0000000..7739bc4
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.txt
@@ -0,0 +1,25 @@
+Synopsys DesignWare AMBA 2.0 Synchronous Serial Interface.
+
+Required properties:
+- compatible : "snps,dw-apb-ssi"
+- reg : The register base for the controller.
+- interrupts : One interrupt, used by the controller.
+- #address-cells : <1>, as required by generic SPI binding.
+- #size-cells : <0>, also as required by generic SPI binding.
+
+Optional properties:
+- num-cs : The number of chipselects. If omitted, this will default to 4.
+
+Child nodes as per the generic SPI binding.
+
+Example:
+
+	spi@fff00000 {
+		compatible = "snps,dw-apb-ssi";
+		reg = <0xfff00000 0x1000>;
+		interrupts = <0 154 4>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		num-cs = <4>;
+	};
+
diff --git a/drivers/spi/spi-dw-mmio.c b/drivers/spi/spi-dw-mmio.c
index 1492f5e..e5f826e 100644
--- a/drivers/spi/spi-dw-mmio.c
+++ b/drivers/spi/spi-dw-mmio.c
@@ -16,6 +16,8 @@
 #include <linux/spi/spi.h>
 #include <linux/scatterlist.h>
 #include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
 
 #include "spi-dw.h"
 
@@ -32,6 +34,7 @@ static int dw_spi_mmio_probe(struct platform_device *pdev)
 	struct dw_spi *dws;
 	struct resource *mem;
 	int ret;
+	int num_cs;
 
 	dwsmmio = devm_kzalloc(&pdev->dev, sizeof(struct dw_spi_mmio),
 			GFP_KERNEL);
@@ -62,12 +65,20 @@ static int dw_spi_mmio_probe(struct platform_device *pdev)
 	dwsmmio->clk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(dwsmmio->clk))
 		return PTR_ERR(dwsmmio->clk);
+
 	ret = clk_prepare_enable(dwsmmio->clk);
 	if (ret)
 		return ret;
 
 	dws->bus_num = pdev->id;
-	dws->num_cs = 4;
+
+	num_cs = 4;
+
+	if (pdev->dev.of_node)
+		of_property_read_u32(pdev->dev.of_node, "num-cs", &num_cs);
+
+	dws->num_cs = num_cs;
+
 	dws->max_freq = clk_get_rate(dwsmmio->clk);
 
 	ret = dw_spi_add_host(&pdev->dev, dws);
@@ -92,12 +103,19 @@ static int dw_spi_mmio_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static const struct of_device_id dw_spi_mmio_of_match[] = {
+	{ .compatible = "snps,dw-apb-ssi", },
+	{ /* end of table */}
+};
+MODULE_DEVICE_TABLE(of, dw_spi_mmio_of_match);
+
 static struct platform_driver dw_spi_mmio_driver = {
 	.probe		= dw_spi_mmio_probe,
 	.remove		= dw_spi_mmio_remove,
 	.driver		= {
 		.name	= DRIVER_NAME,
 		.owner	= THIS_MODULE,
+		.of_match_table = dw_spi_mmio_of_match,
 	},
 };
 module_platform_driver(dw_spi_mmio_driver);
-- 
2.0.0.rc0

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