linux-kernel - Re: [RFC PATCH 1/4] Documentation: mmc: add description for new caps

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Message-ID: <CAD=FV=WNaTEDyVNyteLq3O-BL9KxR49W=44jbXogKXd2dkDWDQ@mail.gmail.com>
Date:	Wed, 22 Jun 2016 08:06:20 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Shawn Lin <shawn.lin@...k-chips.com>
Cc:	Ulf Hansson <ulf.hansson@...aro.org>,
	Jaehoon Chung <jh80.chung@...sung.com>,
	Rob Herring <robh+dt@...nel.org>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Olof Johansson <olof@...om.net>
Subject: Re: [RFC PATCH 1/4] Documentation: mmc: add description for new caps

Hi,

On Wed, Jun 8, 2016 at 1:20 AM, Shawn Lin <shawn.lin@...k-chips.com> wrote:
> Let's add some basic description for cap-no-sdio,
> cap-no-sd and cap-no-mmc.
>
> Signed-off-by: Shawn Lin <shawn.lin@...k-chips.com>
>
> ---
>
>  Documentation/devicetree/bindings/mmc/mmc.txt | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/mmc/mmc.txt b/Documentation/devicetree/bindings/mmc/mmc.txt
> index ecc007a..e16d42b 100644
> --- a/Documentation/devicetree/bindings/mmc/mmc.txt
> +++ b/Documentation/devicetree/bindings/mmc/mmc.txt
> @@ -39,6 +39,9 @@ Optional properties:
>  - cap-power-off-card: powering off the card is safe
>  - cap-mmc-hw-reset: eMMC hardware reset is supported
>  - cap-sdio-irq: enable SDIO IRQ signalling on this interface
> +- cap-no-sdio: skip sending sdio cmd during initialization
> +- cap-no-sd: skip sending sd cmd during initialization
> +- cap-no-mmc: skip sending mmc cmd during initialization

In the past it has been determined that the "cap-" prefix is
unnecessary.  Some properties still have "cap-" because of backward
compatibility reasons, but as I understand it new properties shouldn't
start with "cap-".

See <https://lists.ozlabs.org/pipermail/devicetree-discuss/2013-June/034664.html>
for reference.

-Doug