RE: [PATCH v2 2/3] mmc: davinci_mmc: add DT support

[Manjunathappa, Prakash]

Hi Sekhar,

This mail reached my inbox after I sent out v3.

On Tue, Feb 12, 2013 at 11:51:34, Nori, Sekhar wrote:
> On 2/7/2013 1:27 PM, Manjunathappa, Prakash wrote:
> > Adds device tree support for davinci_mmc. Also add binding documentation.
> > Tested 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: linux-kernel@xxxxxxxxxxxxxxx
> > Cc: davinci-linux-open-source@xxxxxxxxxxxxxxxxxxxx
> > Cc: devicetree-discuss@xxxxxxxxxxxxxxxx
> > Cc: cjb@xxxxxxxxxx
> > Cc: Sekhar Nori <nsekhar@xxxxxx>
> > Cc: mporter@xxxxxx
> > ---
> > Since v1:
> > Modified DT parse function to take default values and accomodate controller
> > version in compatible field.
> > 
> >  .../devicetree/bindings/mmc/davinci_mmc.txt        |   30 ++++++++
> >  drivers/mmc/host/davinci_mmc.c                     |   70 +++++++++++++++++++-
> >  2 files changed, 99 insertions(+), 1 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..6717ab1
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/mmc/davinci_mmc.txt
> > @@ -0,0 +1,30 @@
> > +* 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 <4>, or <8>, default <1>
> > +- max-frequency: Maximum operating clock frequency, default 25MHz.
> > +- mmc-cap-mmc-highspeed: Indicates support for MMC in high speed mode
> > +- mmc-cap-sd-highspeed: Indicates support for SD in high speed mode
> > +
> > +Example:
> > +	mmc0: mmc@1c40000 {
> > +		compatible = "ti,davinci-mmc-da830",
> > +		reg = <0x40000 0x1000>;
> > +		interrupts = <16>;
> > +		status = "okay";
> > +		bus-width = <4>;
> > +		max-frequency = <50000000>;
> > +		mmc-cap-sd-highspeed;
> > +		mmc-cap-mmc-highspeed;
> > +	};
> > +
> > diff --git a/drivers/mmc/host/davinci_mmc.c b/drivers/mmc/host/davinci_mmc.c
> > index 27123f8..3f90316 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>
> >  
> > @@ -1157,15 +1159,80 @@ 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);
> 
> If you are doing this why not also kill passing IP version through
> platform data using a platform_device_id table? Look at what Afzal did
> for drivers/rtc/rtc-omap.c
> 

Agreed, I will send out v4 having these changes also in this series.

Thanks,
Prakash

> Thanks,
> Sekhar
> 

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