Subject: Re: [PATCH 2/2] mmc: esdhc: get voltage from dts file

From: Scott Wood <[email-masked]>
Date: Mon, 22 Jul 2013 21:41:34 -0500

On 07/22/2013 09:38:33 PM, Zhang Haijun-B42677 wrote:
> > -----Original Message-----
> > From: Wood Scott-B07421
> > Sent: Tuesday, July 23, 2013 1:41 AM
> > To: Zhang Haijun-B42677
> > Cc: [email-masked]; [email-masked];
> > [email-masked]; [email-masked]; Fleming Andy-AFLEMING; Zhang
> > Haijun-B42677; Zhang Haijun-B42677
> > Subject: Re: [PATCH 2/2] mmc: esdhc: get voltage from dts file
> >
> > On 07/22/2013 02:53:56 AM, Haijun Zhang wrote:
> > > Add voltage-range support in esdhc of T4, So we can choose to read
> > > voltages from dts file as one optional.
> > > If we can get a valid voltage-range from device node, we use this
> > > voltage as the final voltage support. Else we still read from =20
> capacity
> > > or from other provider.
> > >
> > > Signed-off-by: Haijun Zhang <[email-masked]>
> > > Signed-off-by: Anton Vorontsov <[email-masked]>
> > > ---
> > >  drivers/mmc/host/sdhci-of-esdhc.c | 31
> > > +++++++++++++++++++++++++++++++
> > >  drivers/mmc/host/sdhci.c          |  3 +++
> > >  include/linux/mmc/sdhci.h         |  1 +
> > >  3 files changed, 35 insertions(+)
> > >
> > > diff --git a/drivers/mmc/host/sdhci-of-esdhc.c
> > > b/drivers/mmc/host/sdhci-of-esdhc.c
> > > index 15039e2..8b4b27a 100644
> > > --- a/drivers/mmc/host/sdhci-of-esdhc.c
> > > +++ b/drivers/mmc/host/sdhci-of-esdhc.c
> > > @@ -262,6 +262,35 @@ static int esdhc_pltfm_bus_width(struct
> > > sdhci_host *host, int width)
> > >  	return 0;
> > >  }
> > >
> > > +static void esdhc_get_voltage(struct sdhci_host *host,
> > > +			struct platform_device *pdev)
> > > +{
> > > +	const u32 *voltage_ranges;
> > > +	int num_ranges, i;
> > > +	struct device_node *np;
> > > +	np =3D pdev->dev.of_node;
> > > +
> > > +	voltage_ranges =3D of_get_property(np, "voltage-ranges",
> > > &num_ranges);
> > > +	num_ranges =3D num_ranges / sizeof(*voltage_ranges) / 2;
> > > +	if (!voltage_ranges || !num_ranges) {
> > > +		dev_info(&pdev->dev, "OF: voltage-ranges
> > > unspecified\n");
> > > +		return;
> > > +	}
> > > +
> > > +	for (i =3D 0; i < num_ranges; i++) {
> > > +		const int j =3D i * 2;
> > > +		u32 mask;
> > > +		mask =3D
> > > mmc_vddrange_to_ocrmask(be32_to_cpu(voltage_ranges[j]),
> > > +				be32_to_cpu(voltage_ranges[j + 1]));
> > > +		if (!mask) {
> > > +			dev_info(&pdev->dev,
> > > +				"OF: false voltage-ranges specified\n");
> > > +			return;
> > > +		}
> > > +		host->ocr_mask |=3D mask;
> > > +	}
> > > +}
> >
> > Don't duplicate this code.  Move it somewhere common and share it.
> [Haijun Wrote:] So, move it drivers/mmc/host/sdhci-pltfm.c and share =20
> it as
> Sdhc_get_voltage()....?

I'll let the MMC maintainer say what the appropriate place would be...  =20
Don't capitalize the function name, though. :-)

-Scott=