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

[Rob Herring <robh@xxxxxxxxxx>]

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@xxxxxxxxxxxxxx>.
> 
> Tested-by: John Stultz <john.stultz@xxxxxxxxxx>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
> ---
> 
> 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