linux-kernel - Re: [PATCH V2 1/3] Docs: dt: rockchip: add rk-iommu,disable-reset-quirk property

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Date:   Fri, 21 Jul 2017 08:57:24 +0200
From:   Heiko Stuebner <heiko@...ech.de>
To:     Simon Xue <xxm@...k-chips.com>
Cc:     Joerg Roedel <joro@...tes.org>, linux-rockchip@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 1/3] Docs: dt: rockchip: add rk-iommu,disable-reset-quirk property

Hi Simon,

Am Freitag, 21. Juli 2017, 14:27:08 CEST schrieb Simon Xue:
> From: Simon <xxm@...k-chips.com>
> 
> Add rk-iommu,disable-reset-quirk property to ignore the isp mmu
> reset operation
> 
> Signed-off-by: Simon <xxm@...k-chips.com>

please use your full name in From and Signed-off.

Also, you need to include devicetree-people and mailinglists (as
scripts/get_maintainer.pl will show you) when sending dt-binding
changes.


> ---
> changes since V1:
>  - new added file
> 
>  Documentation/devicetree/bindings/iommu/rockchip,iommu.txt | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/iommu/rockchip,iommu.txt b/Documentation/devicetree/bindings/iommu/rockchip,iommu.txt
> index 9a55ac3..aa2136c 100644
> --- a/Documentation/devicetree/bindings/iommu/rockchip,iommu.txt
> +++ b/Documentation/devicetree/bindings/iommu/rockchip,iommu.txt
> @@ -15,6 +15,11 @@ Required properties:
>                      to associate with its master device.  See:
>                      Documentation/devicetree/bindings/iommu/iommu.txt
>  
> +Optional properties:
> +- rk-iommu,disable-reset-quirk : This ignore the isp mmu reset operation.

Prefix should be "rockchip," not "rk-iommu,".

Also, this quirk could be renamed to something like:

rockchip,disable-mmu-reset: Don't use the mmu reset operation.
				Some mmu instances may produce unexpected results
				when the reset operation is used.

But that is more a 

Heiko

> +				 It can't get the expected result when isp mmu
> +				 reset, but the reset function work normally
> +
>  Example:
>  
>  	vopl_mmu: iommu@...40300 {
>