linux-kernel - Re: [PATCH v2 4/4] dmaengine: rcar-dmac: Add support for R-Car V3U

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Message-ID: <20210126162533.GC928@ninjato>
Date:   Tue, 26 Jan 2021 17:25:33 +0100
From:   Wolfram Sang <wsa+renesas@...g-engineering.com>
To:     Geert Uytterhoeven <geert+renesas@...der.be>
Cc:     Vinod Koul <vkoul@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        dmaengine@...r.kernel.org, devicetree@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/4] dmaengine: rcar-dmac: Add support for R-Car V3U

On Mon, Jan 25, 2021 at 03:24:31PM +0100, Geert Uytterhoeven wrote:
> The DMACs (both SYS-DMAC and RT-DMAC) on R-Car V3U differ slightly from
> the DMACs on R-Car Gen2 and other R-Car Gen3 SoCs:
>   1. The per-channel registers are located in a second register block.
>      Add support for mapping the second block, using the appropriate
>      offsets and stride.
>   2. The common Channel Clear Register (DMACHCLR) was replaced by a
>      per-channel register.
>      Update rcar_dmac_chan_clear{,_all}() to handle this.
>      As rcar_dmac_init() needs to clear the status before the individual
>      channels are probed, channel index and base address initialization
>      are moved forward.
> 
> Inspired by a patch in the BSP by Phong Hoang
> <phong.hoang.wz@...esas.com>.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>

Apporach looks good, didn't check the gory details. However, it still
works fine with I2C + DMA on V3U, so:

Tested-by: Wolfram Sang <wsa+renesas@...g-engineering.com>


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