linux-kernel - Re: [PATCH 1/2] media: dt-bindings: media: Add r8a77965 DRIF bindings

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Message-ID: <20190423105046.cshmwghdufaqp4pj@verge.net.au>
Date:   Tue, 23 Apr 2019 12:50:46 +0200
From:   Simon Horman <horms@...ge.net.au>
To:     Nguyen An Hoan <na-hoan@...so.co.jp>
Cc:     linux-renesas-soc@...r.kernel.org,
        ramesh.shanmugasundaram@...renesas.com,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        kuninori.morimoto.gx@...esas.com, magnus.damm@...il.com,
        yoshihiro.shimoda.uh@...esas.com, h-inayoshi@...so.co.jp,
        cv-dong@...so.co.jp
Subject: Re: [PATCH 1/2] media: dt-bindings: media: Add r8a77965 DRIF bindings

On Tue, Apr 23, 2019 at 07:09:58PM +0900, Nguyen An Hoan wrote:
> From: Hoan Nguyen An <na-hoan@...so.co.jp>
> 
> Add r8a77965 DRIF bindings.
> 
> Signed-off-by: Hoan Nguyen An <na-hoan@...so.co.jp>

According to the User's Manual Hardware, v1.50 Nov 20 2019,
the DRIF IP block M3-N (r8a77965) has a BITCTR register which
is not present on the H3 (r8a7795) or M3-W (r8a77995).

Does the DRIF IP block present on the M3-N (r8a77965) function
without support for this register in the driver?

If not then I think that:
1) This patch should be updated to note that renesas,rcar-gen3-drif
   can only be used with H3 (r8a7795) and M3-W (r8a77995).
2) A driver patch is required
3) The DT patch, 2/2 of this series, should be updated to
   i) Not use renesas,rcar-gen3-drif
   ii) Extend the register aperture from 0x64 to 0x84.

> ---
>  Documentation/devicetree/bindings/media/renesas,drif.txt | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/Documentation/devicetree/bindings/media/renesas,drif.txt b/Documentation/devicetree/bindings/media/renesas,drif.txt
> index 0d8974a..16cdee3 100644
> --- a/Documentation/devicetree/bindings/media/renesas,drif.txt
> +++ b/Documentation/devicetree/bindings/media/renesas,drif.txt
> @@ -41,6 +41,7 @@ Required properties of an internal channel:
>  -------------------------------------------
>  - compatible:	"renesas,r8a7795-drif" if DRIF controller is a part of R8A7795 SoC.
>  		"renesas,r8a7796-drif" if DRIF controller is a part of R8A7796 SoC.
> +		"renesas,r8a77965-drif" if DRIF controller is a part of R8A77965 SoC.
>  		"renesas,rcar-gen3-drif" for a generic R-Car Gen3 compatible device.
>  
>  		When compatible with the generic version, nodes must list the
> -- 
> 2.7.4
>