[PATCH] spi/designware: Add device tree bindings

[<dinguyen-EIB2kfCEclfQT0dZR+AlfA@public.gmane.org>]

From: Dinh Nguyen <dinguyen-EIB2kfCEclfQT0dZR+AlfA@public.gmane.org>

Add device tree bindings for designware spi modules,
specifically, spi-dw-mmio and spi-dw-pci.

Signed-off-by: Dinh Nguyen <dinguyen-EIB2kfCEclfQT0dZR+AlfA@public.gmane.org>
---
 Documentation/devicetree/bindings/spi/spi-dw.txt |   20 +++++++++++++++
 drivers/spi/spi-dw-mmio.c                        |   24 +++++++++++++++---
 drivers/spi/spi-dw-pci.c                         |   29 +++++++++++++++++++---
 3 files changed, 66 insertions(+), 7 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/spi/spi-dw.txt

diff --git a/Documentation/devicetree/bindings/spi/spi-dw.txt b/Documentation/devicetree/bindings/spi/spi-dw.txt
new file mode 100644
index 0000000..10a6e9d
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/spi-dw.txt
@@ -0,0 +1,20 @@
+DesignWare SPI device
+
+Required properties:
+- compatible : should be "snps,dw-spi-mmio" or "snps,dw-spi-pci"
+- reg : offset and length of the register set for the device
+- interrupts: The interrupt number to the cpu. The interrupt specifier format
+  depends on the interrupt controller.
+- num-chipselect: Contains the number of the chipselect
+- bus-num: Bus number
+
+Example:
+		spi: spi@fff00000 {
+				compatible = "snps,dw-spi-mmio";
+				#address-cells = <1>;
+				#size-cells = <0>;
+				reg = <0xfff00000 0x1000>;
+				interrupts = <0 154 4>;
+				num-chipselect = <4>;
+				bus-num = <0>;
+		};
diff --git a/drivers/spi/spi-dw-mmio.c b/drivers/spi/spi-dw-mmio.c
index db2f1ba..555c47a 100644
--- a/drivers/spi/spi-dw-mmio.c
+++ b/drivers/spi/spi-dw-mmio.c
@@ -16,6 +16,7 @@
 #include <linux/spi/spi.h>
 #include <linux/scatterlist.h>
 #include <linux/module.h>
+#include <linux/of.h>
 
 #include "spi-dw.h"
 
@@ -31,7 +32,7 @@ static int __devinit dw_spi_mmio_probe(struct platform_device *pdev)
 	struct dw_spi_mmio *dwsmmio;
 	struct dw_spi *dws;
 	struct resource *mem, *ioarea;
-	int ret;
+	int ret, num_cs, bus_num;
 
 	dwsmmio = kzalloc(sizeof(struct dw_spi_mmio), GFP_KERNEL);
 	if (!dwsmmio) {
@@ -78,9 +79,19 @@ static int __devinit dw_spi_mmio_probe(struct platform_device *pdev)
 	}
 	clk_enable(dwsmmio->clk);
 
+	ret = of_property_read_u32(pdev->dev.of_node, "num-chipselect", &num_cs);
+	if (ret < 0)
+		dws->num_cs = 4;
+	else
+		dws->num_cs = num_cs;
+
+	ret = of_property_read_u32(pdev->dev.of_node, "bus-num", &bus_num);
+	if (ret < 0)
+		dws->bus_num = 0;
+	else
+		dws->bus_num = bus_num;
+
 	dws->parent_dev = &pdev->dev;
-	dws->bus_num = 0;
-	dws->num_cs = 4;
 	dws->max_freq = clk_get_rate(dwsmmio->clk);
 
 	ret = dw_spi_add_host(dws);
@@ -127,12 +138,19 @@ static int __devexit dw_spi_mmio_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static struct of_device_id dw_spi_mmio_of_match[] __devinitdata = {
+		{ .compatible = "snps,dw-spi-mmio", },
+		{ /* sentinel */}
+};
+MODULE_DEVICE_TABLE(of, dw_spi_mmio_of_match);
+
 static struct platform_driver dw_spi_mmio_driver = {
 	.probe		= dw_spi_mmio_probe,
 	.remove		= __devexit_p(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);
diff --git a/drivers/spi/spi-dw-pci.c b/drivers/spi/spi-dw-pci.c
index ff81abb..d6d9d77 100644
--- a/drivers/spi/spi-dw-pci.c
+++ b/drivers/spi/spi-dw-pci.c
@@ -22,6 +22,7 @@
 #include <linux/slab.h>
 #include <linux/spi/spi.h>
 #include <linux/module.h>
+#include <linux/of.h>
 
 #include "spi-dw.h"
 
@@ -38,7 +39,7 @@ static int __devinit spi_pci_probe(struct pci_dev *pdev,
 	struct dw_spi_pci *dwpci;
 	struct dw_spi *dws;
 	int pci_bar = 0;
-	int ret;
+	int ret, num_cs, bus_num;
 
 	printk(KERN_INFO "DW: found PCI SPI controller(ID: %04x:%04x)\n",
 		pdev->vendor, pdev->device);
@@ -71,9 +72,19 @@ static int __devinit spi_pci_probe(struct pci_dev *pdev,
 		goto err_release_reg;
 	}
 
+	ret = of_property_read_u32(pdev->dev.of_node, "num-chipselect", &num_cs);
+	if (ret < 0)
+		dws->num_cs = 4;
+	else
+		dws->num_cs = num_cs;
+
+	ret = of_property_read_u32(pdev->dev.of_node, "bus-num", &bus_num);
+	if (ret < 0)
+		dws->bus_num = 0;
+	else
+		dws->bus_num = bus_num;
+
 	dws->parent_dev = &pdev->dev;
-	dws->bus_num = 0;
-	dws->num_cs = 4;
 	dws->irq = pdev->irq;
 
 	/*
@@ -155,13 +166,23 @@ static DEFINE_PCI_DEVICE_TABLE(pci_ids) = {
 	{},
 };
 
+static struct of_device_id dw_spi_pci_of_match[] __devinitdata = {
+		{ .compatible = "snps,dw-spi-pci", },
+		{ /* sentinel */}
+};
+MODULE_DEVICE_TABLE(of, dw_spi_pci_of_match);
+
 static struct pci_driver dw_spi_driver = {
-	.name =		DRIVER_NAME,
 	.id_table =	pci_ids,
 	.probe =	spi_pci_probe,
 	.remove =	__devexit_p(spi_pci_remove),
 	.suspend =	spi_suspend,
 	.resume	=	spi_resume,
+	.driver		= {
+		.name	= DRIVER_NAME,
+		.owner	= THIS_MODULE,
+		.of_match_table = dw_spi_pci_of_match,
+	},
 };
 
 module_pci_driver(dw_spi_driver);
-- 
1.7.9.5



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