On Sun, Feb 16, 2014 at 04:38:44PM +0800, Shawn Guo wrote:
> @@ -56,6 +59,55 @@ static const struct of_device_id weim_id_table[] = {
> };
> MODULE_DEVICE_TABLE(of, weim_id_table);
>
> +static int __init imx6q_weim_gpr_setup(struct platform_device *pdev)
> +{
> + struct device_node *np = pdev->dev.of_node;
> + struct property *prop;
> + const __be32 *p;
> + struct regmap *gpr;
> + u32 gprvals[4] = {
> + 05, /* CS0(128M) CS1(0M) CS2(0M) CS3(0M) */
> + 033, /* CS0(64M) CS1(64M) CS2(0M) CS3(0M) */
> + 0113, /* CS0(64M) CS1(32M) CS2(32M) CS3(0M) */
> + 01111, /* CS0(64M) CS1(32M) CS2(32M) CS3(0M) */
> + };
> + u32 gprval = 0;
> + u32 val;
> + int cs = 0;
> + int i = 0;
> +
> + gpr = syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
When trying to improve the bindings doc imx-weim.txt, I checked hardware
manuals and found that SoCs imx50, imx53, imx6q, imx6dl and imx6sl all
need the same CS GPR setup. It's inappropriate to look up by hard-coded
compatible "fsl,imx6q-iomuxc-gpr" then. So I'm going to add the
property fsl,weim-cs-gpr back, and update bindings doc accordingly.
Shawn
> + if (IS_ERR(gpr)) {
> + dev_err(&pdev->dev, "failed to find fsl,imx6q-iomuxc-gpr\n");
> + return -ENOENT;
> + }
> +
> + of_property_for_each_u32(np, "ranges", prop, p, val) {
> + if (i % 4 == 0) {
> + cs = val;
> + } else if (i % 4 == 3 && val) {
> + val = (val / SZ_32M) | 1;
> + gprval |= val << cs * 3;
> + }
> + i++;
> + }
> +
> + if (i == 0 || i % 4)
> + goto err;
> +
> + for (i = 0; i < ARRAY_SIZE(gprvals); i++) {
> + if (gprval == gprvals[i]) {
> + /* Found it. Set up IOMUXC_GPR1[11:0] with it. */
> + regmap_update_bits(gpr, IOMUXC_GPR1, 0xfff, gprval);
> + return 0;
> + }
> + }
> +
> +err:
> + dev_err(&pdev->dev, "Invalid 'ranges' configuration\n");
> + return -EINVAL;
> +}
> +
> /* Parse and set the timing for this device. */
> static int __init weim_timing_setup(struct device_node *np, void __iomem
> *base,
> const struct imx_weim_devtype *devtype)
> @@ -92,6 +144,9 @@ static int __init weim_parse_dt(struct platform_device
> *pdev,
> struct device_node *child;
> int ret;
>
> + if (of_device_is_compatible(pdev->dev.of_node, "fsl,imx6q-weim"))
> + imx6q_weim_gpr_setup(pdev);
> +
> for_each_child_of_node(pdev->dev.of_node, child) {
> if (!child->name)
> continue;
> --
> 1.7.9.5
>
>
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