linux-kernel - Re: [PATCH v2 2/3] scsi: ufs: Allow resetting the UFS device

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Message-ID: <20190709014832.GA14402@bogus>
Date:   Mon, 8 Jul 2019 19:48:32 -0600
From:   Rob Herring <robh@...nel.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Mark Rutland <mark.rutland@....com>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        Pedro Sousa <pedrom.sousa@...opsys.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Andy Gross <agross@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Evan Green <evgreen@...omium.org>,
        linux-arm-msm@...r.kernel.org, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-scsi@...r.kernel.org
Subject: Re: [PATCH v2 2/3] scsi: ufs: Allow resetting the UFS device

On Wed, Jun 05, 2019 at 06:02:48PM -0700, Bjorn Andersson wrote:
> Acquire the device-reset GPIO and toggle this to reset the UFS device
> during initialization and host reset.
> 
> Based on downstream support implemented by Subhash Jadavani
> <subhashj@...eaurora.org>.
> 
> Tested-by: John Stultz <john.stultz@...aro.org>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> ---
> 
> Changes since v1:
> - Added gpio to DT binding document
> - Fixed spelling of UFS
> 
>  .../devicetree/bindings/ufs/ufshcd-pltfrm.txt |  2 +
>  drivers/scsi/ufs/ufshcd.c                     | 44 +++++++++++++++++++
>  drivers/scsi/ufs/ufshcd.h                     |  4 ++
>  3 files changed, 50 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt b/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt
> index a74720486ee2..d562d8b4919c 100644
> --- a/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt
> +++ b/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt
> @@ -54,6 +54,8 @@ Optional properties:
>  			  PHY reset from the UFS controller.
>  - resets            : reset node register
>  - reset-names       : describe reset node register, the "rst" corresponds to reset the whole UFS IP.
> +- device-reset-gpios	: A phandle and gpio specifier denoting the GPIO connected
> +			  to the RESET pin of the UFS memory device.

A sign we should have a child node for the device...

Doesn't using 'reset-gpios' work as I doubt one would have a GPIO reset 
for the host controller.

Rob