On Mon, Feb 17, 2014 at 09:48:43AM +0100, Philippe De Muyter wrote:
> > @@ -19,6 +24,26 @@ Required properties:
> >
> > <cs-number> 0 <physical address of mapping> <size>
> >
> > +Optional properties:
> > +
> > + - fsl,weim-cs-gpr: For "fsl,imx50-weim" and "fsl,imx6q-weim" type
> > of
> > + devices, it should be the phandle to the system General
> > + Purpose Register controller that contains WEIM CS GPR
> > + register, e.g. IOMUXC_GPR1 on i.MX6Q. IOMUXC_GPR1[11:0]
> > + should be set up as one of the following 4 possible
> > + values depending on the CS space configuration.
> > +
> > + IOMUXC_GPR1[11:0] CS0 CS1 CS2 CS3
> > + ---------------------------------------------
> > + 05 128M 0M 0M 0M
> > + 033 64M 64M 0M 0M
> > + 0113 64M 32M 32M 0M
> > + 01111 32M 32M 32M 32M
> > +
> > + In case that the property is absent, the reset value or
> > + what bootloader sets up in IOMUXC_GPR1[11:0] will be
> > + used.
> > +
> > Timing property for child nodes. It is mandatory, not optional.
> >
> > - fsl,weim-cs-timing: The timing array, contains timing values for the
>
> Could you also add the following line to the example in the same file :
>
> fsl,weim-cs-gpr = <&gpr>;
>
> It took me some time to figure it out :)
Okay. I will wait comments from DT folks on the binding update for a
while, and then send out v5.
>
> > diff --git a/drivers/bus/imx-weim.c b/drivers/bus/imx-weim.c
> > index 3ef58c8..35e9529 100644
> > --- a/drivers/bus/imx-weim.c
> > +++ b/drivers/bus/imx-weim.c
> > @@ -11,6 +11,9 @@
> > #include <linux/clk.h>
> > #include <linux/io.h>
> > #include <linux/of_device.h>
> > +#include <linux/mfd/syscon.h>
> > +#include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
> > +#include <linux/regmap.h>
> >
> > struct imx_weim_devtype {
> > unsigned int cs_count;
> > @@ -56,6 +59,55 @@ static const struct of_device_id weim_id_table[] = {
> > };
> > MODULE_DEVICE_TABLE(of, weim_id_table);
> >
> > +static int __init imx_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) */
>
> CS0(32M) CS3(32M)
Sure, thanks.
Shawn
>
> > + };
> > + u32 gprval = 0;
> > + u32 val;
> > + int cs = 0;
> > + int i = 0;
> > +
> > + gpr = syscon_regmap_lookup_by_phandle(np, "fsl,weim-cs-gpr");
> > + if (IS_ERR(gpr)) {
> > + dev_dbg(&pdev->dev, "failed to find weim-cs-gpr\n");
> > + return 0;
> > + }
> > +
> > + 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 (devtype == &imx50_weim_devtype)
> > + imx_weim_gpr_setup(pdev);
> > +
> > for_each_child_of_node(pdev->dev.of_node, child) {
> > if (!child->name)
> > continue;
> > --
> > 1.7.9.5
> >
>
> --
> Philippe De Muyter +32 2 6101532 Macq SA rue de l'Aeronef 2 B-1140 Bruxelles
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