linux-kernel - Re: [PATCH v3 3/5] ASoC: fsl_sai: Add support for SAI new version

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Date:   Tue, 6 Aug 2019 18:40:35 -0700
From:   Nicolin Chen <nicoleotsuka@...il.com>
To:     Daniel Baluta <daniel.baluta@....com>
Cc:     broonie@...nel.org, l.stach@...gutronix.de, mihai.serban@...il.com,
        alsa-devel@...a-project.org, timur@...nel.org,
        shengjiu.wang@....com, angus@...ea.ca, tiwai@...e.com,
        linux-imx@....com, kernel@...gutronix.de, festevam@...il.com,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        robh@...nel.org, Mihai Serban <mihai.serban@....com>
Subject: Re: [PATCH v3 3/5] ASoC: fsl_sai: Add support for SAI new version

On Tue, Aug 06, 2019 at 06:12:12PM +0300, Daniel Baluta wrote:
> New IP version introduces Version ID and Parameter registers
> and optionally added Timestamp feature.
> 
> VERID and PARAM registers are placed at the top of registers
> address space and some registers are shifted according to
> the following table:
> 
> Tx/Rx data registers and Tx/Rx FIFO registers keep their
> addresses, all other registers are shifted by 8.
> 
> SAI Memory map is described in chapter 13.10.4.1.1 I2S Memory map
> of the Reference Manual [1].
> 
> In order to make as less changes as possible we attach an offset
> to each register offset to each changed register definition. The
> offset is read from each board private data.
> 
> [1]https://cache.nxp.com/secured/assets/documents/en/reference-manual/IMX8MDQLQRM.pdf?__gda__=1563728701_38bea7f0f726472cc675cb141b91bec7&fileExt=.pdf
> 
> Signed-off-by: Mihai Serban <mihai.serban@....com>
> [initial coding in the NXP internal tree]
> Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
> [bugfixing and cleanups]
> Signed-off-by: Daniel Baluta <daniel.baluta@....com>
> [adapted to linux-next]

Acked-by: Nicolin Chen <nicoleotsuka@...il.com>

One small request that we can do with a separate patch later:

>  struct fsl_sai_soc_data {
>  	bool use_imx_pcm;
>  	unsigned int fifo_depth;
> +	unsigned int reg_offset;
>  };

I think we need a list of comments for the structure defines.
It might be okay for the old two entries but reg_offset isn't
that explicit any more.