linux-kernel - Re: [PATCH v3 3/5] ARM: mvebu: set SW polling as SDHCI card detection on A388-GP

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Message-ID: <878u72hgt9.fsf@free-electrons.com>
Date:	Fri, 16 Oct 2015 19:19:30 +0200
From:	Gregory CLEMENT <gregory.clement@...e-electrons.com>
To:	Marcin Wojtas <mw@...ihalf.com>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-mmc@...r.kernel.org, ulf.hansson@...aro.org,
	sebastian.hesselbarth@...il.com, andrew@...n.ch,
	jason@...edaemon.net, thomas.petazzoni@...e-electrons.com,
	nadavh@...vell.com, alior@...vell.com, tawfik@...vell.com,
	jaz@...ihalf.com, jszhang@...vell.com
Subject: Re: [PATCH v3 3/5] ARM: mvebu: set SW polling as SDHCI card detection on A388-GP

Hi Marcin,
 
 On jeu., oct. 15 2015, Marcin Wojtas <mw@...ihalf.com> wrote:

> The newest revisions of A388-GP (v1.5 and higher) support only
> DAT3-based card detection. Revisions < v1.5 based on GPIO detection
> via I2C expander, but this solution is supposed to be deprecated on
> new boards. In order to satisfy all type of hardware this commit
> changes card detection to use software polling mechanism. Also a
> comment is added on possible card detection options in A388-GP
> DT board file.
>
> Signed-off-by: Marcin Wojtas <mw@...ihalf.com>
> Acked-by: Andrew Lunn <andrew@...n.ch>

Applied on mvebu/dt

Thanks,

Gregory

> ---
>  arch/arm/boot/dts/armada-388-gp.dts | 15 ++++++++++++++-
>  1 file changed, 14 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm/boot/dts/armada-388-gp.dts b/arch/arm/boot/dts/armada-388-gp.dts
> index 391dea9..3deba13 100644
> --- a/arch/arm/boot/dts/armada-388-gp.dts
> +++ b/arch/arm/boot/dts/armada-388-gp.dts
> @@ -213,8 +213,21 @@
>  			sdhci@...00 {
>  				pinctrl-names = "default";
>  				pinctrl-0 = <&sdhci_pins>;
> -				cd-gpios = <&expander0 5 GPIO_ACTIVE_LOW>;
>  				no-1-8-v;
> +				/*
> +				 * A388-GP board v1.5 and higher replace
> +				 * hitherto card detection method based on GPIO
> +				 * with the one using DAT3 pin. As they are
> +				 * incompatible, software-based polling is
> +				 * enabled with 'broken-cd' property. For boards
> +				 * older than v1.5 it can be replaced with:
> +				 * 'cd-gpios = <&expander0 5 GPIO_ACTIVE_LOW>;',
> +				 * whereas for the newer ones following can be
> +				 * used instead:
> +				 * 'dat3-cd;'
> +				 * 'cd-inverted;'
> +				 */
> +				broken-cd;
>  				wp-inverted;
>  				bus-width = <8>;
>  				status = "okay";
> -- 
> 1.8.3.1
>

-- 
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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