linux-kernel - Re: [PATCH V2 2/9] Documentation: devicetree: Add DT bindings for UFS host controller

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Message-ID: <CAOesGMij6oKDr0BCRAnmz-r48S5FzzMcU_iyCyCyqkafWsmyNA@mail.gmail.com>
Date:	Tue, 14 May 2013 11:08:49 -0700
From:	Olof Johansson <olof@...om.net>
To:	Dolev Raviv <draviv@...eaurora.org>
Cc:	linux-scsi@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	Sujit Reddy Thumma <sthumma@...eaurora.org>,
	"moderated list:OPEN FIRMWARE AND..." 
	<devicetree-discuss@...ts.ozlabs.org>,
	"open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2 2/9] Documentation: devicetree: Add DT bindings for UFS
 host controller

On Tue, May 14, 2013 at 12:08 AM, Dolev Raviv <draviv@...eaurora.org> wrote:
> Compatible list is used in commit 03b1781 but is not documented.
> Add necessary device tree bindings to describe on-chip UFS host
> controllers.
>
> Signed-off-by: Sujit Reddy Thumma <sthumma@...eaurora.org>
>
> diff --git a/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt b/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt
> new file mode 100644
> index 0000000..20468b2
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt
> @@ -0,0 +1,16 @@
> +* Universal Flash Storage (UFS) Host Controller
> +
> +UFSHC nodes are defined to describe on-chip UFS host controllers.
> +Each UFS controller instance should have its own node.
> +
> +Required properties:
> +- compatible        : compatible list, contains "jedec,ufs-1.1"
> +- interrupts        : <interrupt mapping for UFS host controller IRQ>
> +- reg               : <registers mapping>
> +
> +Example:
> +       ufshc@...c598000 {
> +               compatible = "jedec,ufs-1.1";

Hmm.

Does jedec really specify the programming interface of this type of
device, register layout and meaning? It seems to be more about the
command set and electrical/connectivity specifications, no?


-Olof
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