Merge tag 'imx-weim-3.12' of git://git.linaro.org/people/shawnguo/linux-2.6 into next/soc

From Shawn Guo:
This is a patch series that updates imx-weim bus driver to have it
support more i.MX SoCs. Because there is no maintainer for
drivers/bus so far, I'm forwarding it through IMX tree for 3.12 merge
window.

* tag 'imx-weim-3.12' of git://git.linaro.org/people/shawnguo/linux-2.6:
drivers: bus: imx-weim: Add support for i.MX1/21/25/27/31/35/50/51/53
drivers: bus: imx-weim: Add missing platform_driver.owner field
drivers: bus: imx-weim: use module_platform_driver_probe()
drivers: bus: imx-weim: Simplify error path
drivers: bus: imx-weim: Remove private driver data

Documentation/devicetree/bindings/bus/imx-weim.txt

···
 
 Required properties:
 
- - compatible:		Should be set to "fsl,imx6q-weim"
+ - compatible:		Should be set to "fsl,<soc>-weim"
  - reg:			A resource specifier for the register space
 			(see the example below)
  - clocks:		the clock, see the example below.
···
 
 Timing property for child nodes. It is mandatory, not optional.
 
- - fsl,weim-cs-timing:	The timing array, contains 6 timing values for the
+ - fsl,weim-cs-timing:	The timing array, contains timing values for the
 			child node. We can get the CS index from the child
-			node's "reg" property. This property contains the values
-			for the registers EIM_CSnGCR1, EIM_CSnGCR2, EIM_CSnRCR1,
-			EIM_CSnRCR2, EIM_CSnWCR1, EIM_CSnWCR2 in this order.
+			node's "reg" property. The number of registers depends
+			on the selected chip.
+			For i.MX1, i.MX21 ("fsl,imx1-weim") there are two
+			registers: CSxU, CSxL.
+			For i.MX25, i.MX27, i.MX31 and i.MX35 ("fsl,imx27-weim")
+			there are three registers: CSCRxU, CSCRxL, CSCRxA.
+			For i.MX50, i.MX53 ("fsl,imx50-weim"),
+			i.MX51 ("fsl,imx51-weim") and i.MX6Q ("fsl,imx6q-weim")
+			there are six registers: CSxGCR1, CSxGCR2, CSxRCR1,
+			CSxRCR2, CSxWCR1, CSxWCR2.
 
 Example for an imx6q-sabreauto board, the NOR flash connected to the WEIM:
 

drivers/bus/Kconfig

···
 	bool "Freescale EIM DRIVER"
 	depends on ARCH_MXC
 	help
-	  Driver for i.MX6 WEIM controller.
+	  Driver for i.MX WEIM controller.
 	  The WEIM(Wireless External Interface Module) works like a bus.
 	  You can attach many different devices on it, such as NOR, onenand.
-	  But now, we only support the Parallel NOR.
 
 config MVEBU_MBUS
 	bool

drivers/bus/imx-weim.c

···
 #include <linux/io.h>
 #include <linux/of_device.h>
 
-struct imx_weim {
-	void __iomem *base;
-	struct clk *clk;
+struct imx_weim_devtype {
+	unsigned int	cs_count;
+	unsigned int	cs_regs_count;
+	unsigned int	cs_stride;
+};
+
+static const struct imx_weim_devtype imx1_weim_devtype = {
+	.cs_count	= 6,
+	.cs_regs_count	= 2,
+	.cs_stride	= 0x08,
+};
+
+static const struct imx_weim_devtype imx27_weim_devtype = {
+	.cs_count	= 6,
+	.cs_regs_count	= 3,
+	.cs_stride	= 0x10,
+};
+
+static const struct imx_weim_devtype imx50_weim_devtype = {
+	.cs_count	= 4,
+	.cs_regs_count	= 6,
+	.cs_stride	= 0x18,
+};
+
+static const struct imx_weim_devtype imx51_weim_devtype = {
+	.cs_count	= 6,
+	.cs_regs_count	= 6,
+	.cs_stride	= 0x18,
 };
 
 static const struct of_device_id weim_id_table[] = {
-	{ .compatible = "fsl,imx6q-weim", },
-	{}
+	/* i.MX1/21 */
+	{ .compatible = "fsl,imx1-weim", .data = &imx1_weim_devtype, },
+	/* i.MX25/27/31/35 */
+	{ .compatible = "fsl,imx27-weim", .data = &imx27_weim_devtype, },
+	/* i.MX50/53/6Q */
+	{ .compatible = "fsl,imx50-weim", .data = &imx50_weim_devtype, },
+	{ .compatible = "fsl,imx6q-weim", .data = &imx50_weim_devtype, },
+	/* i.MX51 */
+	{ .compatible = "fsl,imx51-weim", .data = &imx51_weim_devtype, },
+	{ }
 };
 MODULE_DEVICE_TABLE(of, weim_id_table);
 
-#define CS_TIMING_LEN 6
-#define CS_REG_RANGE  0x18
-
 /* Parse and set the timing for this device. */
-static int
-weim_timing_setup(struct platform_device *pdev, struct device_node *np)
+static int __init weim_timing_setup(struct device_node *np, void __iomem *base,
+				    const struct imx_weim_devtype *devtype)
 {
-	struct imx_weim *weim = platform_get_drvdata(pdev);
-	u32 value[CS_TIMING_LEN];
-	u32 cs_idx;
-	int ret;
-	int i;
+	u32 cs_idx, value[devtype->cs_regs_count];
+	int i, ret;
 
 	/* get the CS index from this child node's "reg" property. */
 	ret = of_property_read_u32(np, "reg", &cs_idx);
 	if (ret)
 		return ret;
 
-	/* The weim has four chip selects. */
-	if (cs_idx > 3)
+	if (cs_idx >= devtype->cs_count)
 		return -EINVAL;
 
 	ret = of_property_read_u32_array(np, "fsl,weim-cs-timing",
-					value, CS_TIMING_LEN);
+					 value, devtype->cs_regs_count);
 	if (ret)
 		return ret;
 
 	/* set the timing for WEIM */
-	for (i = 0; i < CS_TIMING_LEN; i++)
-		writel(value[i], weim->base + cs_idx * CS_REG_RANGE + i * 4);
+	for (i = 0; i < devtype->cs_regs_count; i++)
+		writel(value[i], base + cs_idx * devtype->cs_stride + i * 4);
+
 	return 0;
 }
 
-static int weim_parse_dt(struct platform_device *pdev)
+static int __init weim_parse_dt(struct platform_device *pdev,
+				void __iomem *base)
 {
+	const struct of_device_id *of_id = of_match_device(weim_id_table,
+							   &pdev->dev);
+	const struct imx_weim_devtype *devtype = of_id->data;
 	struct device_node *child;
 	int ret;
 
···
 		if (!child->name)
 			continue;
 
-		ret = weim_timing_setup(pdev, child);
+		ret = weim_timing_setup(child, base, devtype);
 		if (ret) {
 			dev_err(&pdev->dev, "%s set timing failed.\n",
 				child->full_name);
···
 	return ret;
 }
 
-static int weim_probe(struct platform_device *pdev)
+static int __init weim_probe(struct platform_device *pdev)
 {
-	struct imx_weim *weim;
 	struct resource *res;
-	int ret = -EINVAL;
-
-	weim = devm_kzalloc(&pdev->dev, sizeof(*weim), GFP_KERNEL);
-	if (!weim) {
-		ret = -ENOMEM;
-		goto weim_err;
-	}
-	platform_set_drvdata(pdev, weim);
+	struct clk *clk;
+	void __iomem *base;
+	int ret;
 
 	/* get the resource */
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	weim->base = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(weim->base)) {
-		ret = PTR_ERR(weim->base);
-		goto weim_err;
-	}
+	base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
 
 	/* get the clock */
-	weim->clk = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(weim->clk))
-		goto weim_err;
+	clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
 
-	ret = clk_prepare_enable(weim->clk);
+	ret = clk_prepare_enable(clk);
 	if (ret)
-		goto weim_err;
+		return ret;
 
 	/* parse the device node */
-	ret = weim_parse_dt(pdev);
-	if (ret) {
-		clk_disable_unprepare(weim->clk);
-		goto weim_err;
-	}
+	ret = weim_parse_dt(pdev, base);
+	if (ret)
+		clk_disable_unprepare(clk);
+	else
+		dev_info(&pdev->dev, "Driver registered.\n");
 
-	dev_info(&pdev->dev, "WEIM driver registered.\n");
-	return 0;
-
-weim_err:
 	return ret;
 }
 
 static struct platform_driver weim_driver = {
 	.driver = {
-		.name = "imx-weim",
-		.of_match_table = weim_id_table,
+		.name		= "imx-weim",
+		.owner		= THIS_MODULE,
+		.of_match_table	= weim_id_table,
 	},
-	.probe   = weim_probe,
 };
+module_platform_driver_probe(weim_driver, weim_probe);
 
-module_platform_driver(weim_driver);
 MODULE_AUTHOR("Freescale Semiconductor Inc.");
 MODULE_DESCRIPTION("i.MX EIM Controller Driver");
 MODULE_LICENSE("GPL");