linux-kernel - Re: [PATCH 2/2] ARM: dts: at91: sama5d27_som1

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Message-ID: <20190809062322.syuieymdqjs4e7lh@M43218.corp.atmel.com>
Date:   Fri, 9 Aug 2019 08:23:22 +0200
From:   Ludovic Desroches <ludovic.desroches@...rochip.com>
To:     Adrian Hunter <adrian.hunter@...el.com>
CC:     Eugen Hristev - M18282 <Eugen.Hristev@...rochip.com>,
        "Nicolas Ferre - M43238" <Nicolas.Ferre@...rochip.com>,
        "alexandre.belloni@...tlin.com" <alexandre.belloni@...tlin.com>,
        "ulf.hansson@...aro.org" <ulf.hansson@...aro.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>
Subject: Re: [PATCH 2/2] ARM: dts: at91: sama5d27_som1_ek: add mmc
 capabilities for SDMMC0

On Thu, Aug 08, 2019 at 03:57:30PM +0300, Adrian Hunter wrote:
> On 8/08/19 3:42 PM, Ludovic Desroches wrote:
> > On Thu, Aug 08, 2019 at 10:35:43AM +0200, Eugen Hristev - M18282 wrote:
> >> From: Eugen Hristev <eugen.hristev@...rochip.com>
> >>
> >> Add mmc capabilities for SDMMC0 for this board.
> >> With this enabled, eMMC connected card is detected as:
> >>
> >> mmc0: new DDR MMC card at address 0001
> >>
> >> Signed-off-by: Eugen Hristev <eugen.hristev@...rochip.com>
> > Acked-by: Ludovic Desroches <ludovic.desroches@...rochip.com>
> > 
> > I am interested to have the some insights about the use of sd-uhs-*
> > properties.
> > 
> > Our IP can't deal with 1V8 by itself. It has a 1V8SEL signal which can
> > be used as the logic control input of a mux. So even if the IP claims
> > to support UHS modes, it depends on the board.
> > 
> > Are the sd-uhs-* properties a way to deal with this? I tend to think no
> > as sdhci_setup_host() will set the caps depending on the content of the
> > capabilities register. Do we have to use the SDHCI_QUIRK_MISSING_CAPS
> > quirk or sdhci-caps/sdhci-caps-mask?
> 
> There is "no-1-8-v" which it looks like sdhci-of-at91.c already supports:
> 
>   sdhci_at91_probe() -> sdhci_get_of_property() -> sdhci_get_property()
> 
>     	if (device_property_present(dev, "no-1-8-v"))
> 		host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V;
> 

Right, I forgot this property. Thanks.

Eugen, do you see cases we can't cover with this property?

Regards

Ludovic

> 
> > 
> > Regards
> > 
> > Ludovic
> > 
> >> ---
> >>  arch/arm/boot/dts/at91-sama5d27_som1_ek.dts | 1 +
> >>  1 file changed, 1 insertion(+)
> >>
> >> diff --git a/arch/arm/boot/dts/at91-sama5d27_som1_ek.dts b/arch/arm/boot/dts/at91-sama5d27_som1_ek.dts
> >> index 149e539..194b3a3 100644
> >> --- a/arch/arm/boot/dts/at91-sama5d27_som1_ek.dts
> >> +++ b/arch/arm/boot/dts/at91-sama5d27_som1_ek.dts
> >> @@ -54,6 +54,7 @@
> >>  
> >>  		sdmmc0: sdio-host@...00000 {
> >>  			bus-width = <8>;
> >> +			mmc-ddr-3_3v;
> >>  			pinctrl-names = "default";
> >>  			pinctrl-0 = <&pinctrl_sdmmc0_default>;
> >>  			status = "okay";
> >> -- 
> >> 2.7.4
> >>
> > 
>