| Message ID | 1392296342-21115-1-git-send-email-shawn.guo@linaro.org |
|---|---|
| State | New |
| Headers | show |
On Thu, Feb 13, 2014 at 11:38:25PM +0100, Philippe De Muyter wrote: > Hi Shawn, > > On Thu, Feb 13, 2014 at 08:59:02PM +0800, Shawn Guo wrote: > > For imx6q-weim type of device, there might a WEIM CS space configuration > > register in General Purpose Register controller, e.g. IOMUXC_GPR1 on > > i.MX6Q. > > > > Depending on which configuration of the following 4 is chosen for given > > system, IOMUXC_GPR1[11:0] should be set up as 05, 033, 0113 or 01111 > > correspondingly. > > > > CS0(128M) CS1(0M) CS2(0M) CS3(0M) > > CS0(64M) CS1(64M) CS2(0M) CS3(0M) > > CS0(64M) CS1(32M) CS2(32M) CS3(0M) > > CS0(32M) CS1(32M) CS2(32M) CS3(32M) > > > > The patch creates a function for imx6q-weim type of device, which scans > > 'ranges' property of WEIM node and build the GPR value incrementally. > > Thus the WEIM CS GPR can be set up automatically at boot time. > > Please add that text to Documentation/devicetree/bindings/bus/imx-weim.txt. Since the patch does not add any new device tree properties, I do not think we need to necessarily update bindings doc in this patch. I prefer to improve the doc with another separate patch. > > > > > Signed-off-by: Shawn Guo <shawn.guo@linaro.org> > > --- > > Changes since v1: > > - Drop device tree property fsl,weim-cs-gpr > > - Use octal value for IOMUXC_GPR1[11:0] bit field > > - Use of_property_for_each_u32() to build gprval incrementally > > > > drivers/bus/imx-weim.c | 59 ++++++++++++++++++++++++++++++++++++++++++++++++ > > 1 file changed, 59 insertions(+) > > > > diff --git a/drivers/bus/imx-weim.c b/drivers/bus/imx-weim.c > > index 3ef58c8..a120c93 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 +59,59 @@ 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) */ > > + 0111, /* CS0(64M) CS1(32M) CS2(32M) CS3(0M) */ > > 01111, /* CS0(32M) CS1(32M) CS2(32M) CS3(32M) */ Oops, thanks. > > > + }; > > + u32 gprval = 0; > > + u32 val; > > + int len; > > + int cs = 0; > > + int i = 0; > > + > > + gpr = syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr"); > > + if (IS_ERR(gpr)) { > > + dev_err(&pdev->dev, "failed to find fsl,imx6q-iomuxc-gpr\n"); > > + return -ENOENT; > > + } > > + > > + prop = of_find_property(np, "ranges", &len); > > + if (prop == NULL) > > + return -ENOENT; > > + if (len % (sizeof(u32) * 4)) > > + return -EINVAL; > > + > > + of_property_for_each_u32(np, "ranges", prop, p, val) { > > + if (i % 4 == 0) { > > + cs = val; > > + } else if (i % 4 == 3 && val) { > > + val /= SZ_64M; > > + val = (val << 1) | 1; > > or > val = (val / SZ_32M) | 1; Okay. > > > + gprval |= val << cs * 3; > > + } > > + i++; > > + } > > You may replace the tests above (from "prop = of_find_property" to "EINVAL;") > by : > if (i == 0 || (i % 4)) > goto err; Yeah, it's better. I will roll these changes into v3. > > + > > + 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 +148,9 @@ 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 > > > > I have tested this v2 patch, and, except for the typo (0111 instead of 01111), > it works perfectly. Thanks for testing. Shawn -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/bus/imx-weim.c b/drivers/bus/imx-weim.c index 3ef58c8..a120c93 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 +59,59 @@ 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) */ + 0111, /* CS0(64M) CS1(32M) CS2(32M) CS3(0M) */ + }; + u32 gprval = 0; + u32 val; + int len; + int cs = 0; + int i = 0; + + gpr = syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr"); + if (IS_ERR(gpr)) { + dev_err(&pdev->dev, "failed to find fsl,imx6q-iomuxc-gpr\n"); + return -ENOENT; + } + + prop = of_find_property(np, "ranges", &len); + if (prop == NULL) + return -ENOENT; + if (len % (sizeof(u32) * 4)) + return -EINVAL; + + of_property_for_each_u32(np, "ranges", prop, p, val) { + if (i % 4 == 0) { + cs = val; + } else if (i % 4 == 3 && val) { + val /= SZ_64M; + val = (val << 1) | 1; + gprval |= val << cs * 3; + } + i++; + } + + 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; + } + } + + 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 +148,9 @@ 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;
For imx6q-weim type of device, there might a WEIM CS space configuration register in General Purpose Register controller, e.g. IOMUXC_GPR1 on i.MX6Q. Depending on which configuration of the following 4 is chosen for given system, IOMUXC_GPR1[11:0] should be set up as 05, 033, 0113 or 01111 correspondingly. CS0(128M) CS1(0M) CS2(0M) CS3(0M) CS0(64M) CS1(64M) CS2(0M) CS3(0M) CS0(64M) CS1(32M) CS2(32M) CS3(0M) CS0(32M) CS1(32M) CS2(32M) CS3(32M) The patch creates a function for imx6q-weim type of device, which scans 'ranges' property of WEIM node and build the GPR value incrementally. Thus the WEIM CS GPR can be set up automatically at boot time. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> --- Changes since v1: - Drop device tree property fsl,weim-cs-gpr - Use octal value for IOMUXC_GPR1[11:0] bit field - Use of_property_for_each_u32() to build gprval incrementally drivers/bus/imx-weim.c | 59 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 59 insertions(+)