> -----Original Message----- > From: Anton Vorontsov [mailto:cbouatmai...@gmail.com] > Sent: Friday, July 30, 2010 15:06 PM > To: Zang Roy-R61911 > Cc: linux-...@vger.kernel.org; linuxppc-...@ozlabs.org; > a...@linux-foundation.org > Subject: Re: [PATCH 3/3 v2] mmc: Add ESDHC weird voltage bits > workaround > > On Fri, Jul 30, 2010 at 11:52:57AM +0800, Roy Zang wrote: > > P4080 ESDHC controller does not support 1.8V and 3.0V > voltage. but the > > host controller capabilities register wrongly set the bits. > > This patch adds the workaround to correct the weird voltage > setting bits. > > > > Signed-off-by: Roy Zang <tie-fei.z...@freescale.com> > > --- > [...] > > diff --git a/drivers/mmc/host/sdhci-of-core.c > b/drivers/mmc/host/sdhci-of-core.c > > index 0c30242..1f3913d 100644 > > --- a/drivers/mmc/host/sdhci-of-core.c > > +++ b/drivers/mmc/host/sdhci-of-core.c > > @@ -164,6 +164,10 @@ static int __devinit > sdhci_of_probe(struct of_device *ofdev, > > if (sdhci_of_wp_inverted(np)) > > host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT; > > > > + if (of_device_is_compatible(np, "fsl,p4080-esdhc")) > > + host->quirks |= (SDHCI_QUIRK_QORIQ_NO_VDD_180 > > + |SDHCI_QUIRK_QORIQ_NO_VDD_300); > > + > > It should be two properties, something like sdhci,no-vdd-180 > and sdhci,no-vdd-300. But it might be even better: we have > voltage-ranges for mmc-spi case, see > Documentation/powerpc/dts-bindings/mmc-spi-slot.txt. > > If voltage-ranges specified, then we use it, not capabilities > register. > > For p4080 it will be 'voltage-ranges = <3200 3400>;'. So, with > voltage-ranges we can do fine grained VDD control without > introducing anything new. why not voltage-ranges = <3300 3300>; ? Roy
_______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
