Hi Mark,
On Tue, Feb 12, 2013 at 16:30:48, Mark Rutland wrote:
> Hi Prakash,
>
> I think this looks pretty good now :)
>
> Reviewed-by: Mark Rutland <mark.rutland@xxxxxxx>
>
Thanks for inputs, I will add your Reviewed-by for future versions of this patch.
Regards,
Prakash
> Thanks,
> Mark.
>
> On Tue, Feb 12, 2013 at 06:37:36AM +0000, Manjunathappa, Prakash wrote:
> > Adds device tree support for davinci_mmc. Also add binding documentation.
> > As of now in non-dma PIO mode and without GPIO card_detect/write_protect
> > option because of dependencies on EDMA and GPIO module DT support.
> >
> > Signed-off-by: Manjunathappa, Prakash <prakash.pm@xxxxxx>
> > Cc: linux-mmc@xxxxxxxxxxxxxxx
> > Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> > Cc: davinci-linux-open-source@xxxxxxxxxxxxxxxxxxxx
> > Cc: devicetree-discuss@xxxxxxxxxxxxxxxx
> > Cc: cjb@xxxxxxxxxx
> > Cc: Sekhar Nori <nsekhar@xxxxxx>
> > Cc: mporter@xxxxxx
> > ---
> > Since v2:
> > Modified the default value for bus-width and removed the support for
> > highspeed card capabilties for now.
> > Since v1:
> > Modified DT parse function to take default values and accomodate controller
> > version in compatible field.
> >
> > .../devicetree/bindings/mmc/davinci_mmc.txt | 25 ++++++++
> > drivers/mmc/host/davinci_mmc.c | 65 +++++++++++++++++++-
> > 2 files changed, 88 insertions(+), 2 deletions(-)
> > create mode 100644 Documentation/devicetree/bindings/mmc/davinci_mmc.txt
> >
> > diff --git a/Documentation/devicetree/bindings/mmc/davinci_mmc.txt b/Documentation/devicetree/bindings/mmc/davinci_mmc.txt
> > new file mode 100644
> > index 0000000..247be0f
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/mmc/davinci_mmc.txt
> > @@ -0,0 +1,25 @@
> > +* TI Highspeed MMC host controller for DaVinci
> > +
> > +The Highspeed MMC Host Controller on TI DaVinci family
> > +provides an interface for MMC, SD and SDIO types of memory cards.
> > +
> > +This file documents the properties used by the davinci_mmc driver.
> > +
> > +Required properties:
> > +- compatible:
> > + Should be "ti,davinci-mmc-da830": for da830, da850, dm365
> > + Should be "ti,davinci-mmc-dm355": for dm355, dm644x
> > +
> > +Optional properties:
> > +- bus-width: Number of data lines, can be <1>, <4>, or <8>, default <1>
> > +- max-frequency: Maximum operating clock frequency, default 25MHz.
> > +
> > +Example:
> > + mmc0: mmc@1c40000 {
> > + compatible = "ti,davinci-mmc-da830",
> > + reg = <0x40000 0x1000>;
> > + interrupts = <16>;
> > + status = "okay";
> > + bus-width = <4>;
> > + max-frequency = <50000000>;
> > + };
> > diff --git a/drivers/mmc/host/davinci_mmc.c b/drivers/mmc/host/davinci_mmc.c
> > index 27123f8..66ca6bf 100644
> > --- a/drivers/mmc/host/davinci_mmc.c
> > +++ b/drivers/mmc/host/davinci_mmc.c
> > @@ -34,6 +34,8 @@
> > #include <linux/dma-mapping.h>
> > #include <linux/edma.h>
> > #include <linux/mmc/mmc.h>
> > +#include <linux/of.h>
> > +#include <linux/of_device.h>
> >
> > #include <linux/platform_data/mmc-davinci.h>
> >
> > @@ -1157,16 +1159,74 @@ static void __init init_mmcsd_host(struct mmc_davinci_host *host)
> > mmc_davinci_reset_ctrl(host, 0);
> > }
> >
> > -static int __init davinci_mmcsd_probe(struct platform_device *pdev)
> > +static const struct of_device_id davinci_mmc_dt_ids[] = {
> > + {
> > + .compatible = "ti,davinci-mmc-dm355",
> > + .data = (void *)MMC_CTLR_VERSION_1,
> > + },
> > + {
> > + .compatible = "ti,davinci-mmc-da830",
> > + .data = (void *)MMC_CTLR_VERSION_2,
> > + },
> > + {},
> > +};
> > +MODULE_DEVICE_TABLE(of, davinci_mmc_dt_ids);
> > +
> > +static struct davinci_mmc_config
> > + *mmc_parse_pdata(struct platform_device *pdev)
> > {
> > + struct device_node *np;
> > struct davinci_mmc_config *pdata = pdev->dev.platform_data;
> > + const struct of_device_id *match =
> > + of_match_device(of_match_ptr(davinci_mmc_dt_ids), &pdev->dev);
> > + u32 data;
> > +
> > + np = pdev->dev.of_node;
> > + if (!np)
> > + return pdata;
> > +
> > + pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
> > + if (!pdata) {
> > + dev_err(&pdev->dev, "Failed to allocate memory for struct davinci_mmc_config\n");
> > + goto nodata;
> > + }
> > +
> > + if (match->data)
> > + pdata->version = (u8)((int)match->data);
> > +
> > + of_property_read_u32(np, "max-frequency", &pdata->max_freq);
> > + if (!pdata->max_freq)
> > + dev_info(&pdev->dev, "'max-frequency' property not specified, defaulting to 25MHz\n");
> > +
> > + of_property_read_u32(np, "bus-width", &data);
> > + switch (data) {
> > + case 1:
> > + case 4:
> > + case 8:
> > + pdata->wires = data;
> > + break;
> > + default:
> > + pdata->wires = 1;
> > + dev_info(&pdev->dev, "Unsupported buswidth, defaulting to 1 bit\n");
> > + }
> > +nodata:
> > + return pdata;
> > +}
> > +
> > +static int __init davinci_mmcsd_probe(struct platform_device *pdev)
> > +{
> > + struct davinci_mmc_config *pdata = NULL;
> > struct mmc_davinci_host *host = NULL;
> > struct mmc_host *mmc = NULL;
> > struct resource *r, *mem = NULL;
> > int ret = 0, irq = 0;
> > size_t mem_size;
> >
> > - /* REVISIT: when we're fully converted, fail if pdata is NULL */
> > + pdata = mmc_parse_pdata(pdev);
> > + if (pdata == NULL) {
> > + dev_err(&pdev->dev, "Can not get platform data\n");
> > + return -ENOENT;
> > + }
> >
> > ret = -ENODEV;
> > r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > @@ -1408,6 +1468,7 @@ static struct platform_driver davinci_mmcsd_driver = {
> > .name = "davinci_mmc",
> > .owner = THIS_MODULE,
> > .pm = davinci_mmcsd_pm_ops,
> > + .of_match_table = of_match_ptr(davinci_mmc_dt_ids),
> > },
> > .remove = __exit_p(davinci_mmcsd_remove),
> > };
> > --
> > 1.7.4.1
> >
> > _______________________________________________
> > devicetree-discuss mailing list
> > devicetree-discuss@xxxxxxxxxxxxxxxx
> > https://lists.ozlabs.org/listinfo/devicetree-discuss
> >
>
>
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