linux-kernel - Re: [PATCH v3 4/8] scpi: Add support for Legacy match table for Amlogic GXBB SoC

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Date:   Mon, 19 Sep 2016 16:50:18 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     Neil Armstrong <narmstrong@...libre.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Sudeep Holla <sudeep.holla@....com>,
        linux-amlogic@...ts.infradead.org, khilman@...libre.com,
        heiko@...ech.de, wxt@...k-chips.com, frank.wang@...k-chips.com
Subject: Re: [PATCH v3 4/8] scpi: Add support for Legacy match table for
 Amlogic GXBB SoC



On 07/09/16 16:34, Neil Armstrong wrote:
> Add new DT match table to setup the is_legacy boolean value across
> the scpi functions.
> Add the Amlogic GXBB SoC compatible for platform and as legacy match entry.
>
> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
> ---
>  drivers/firmware/arm_scpi.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
>
> diff --git a/drivers/firmware/arm_scpi.c b/drivers/firmware/arm_scpi.c
> index 6a16100..60a76e63 100644
> --- a/drivers/firmware/arm_scpi.c
> +++ b/drivers/firmware/arm_scpi.c
> @@ -979,6 +979,11 @@ static int scpi_alloc_xfer_list(struct device *dev, struct scpi_chan *ch)
>  	return 0;
>  }
>
> +static const struct of_device_id legacy_scpi_of_match[] = {
> +	{.compatible = "amlogic,meson-gxbb-scpi"},
> +	{},
> +};

This needs to be documented.

> +
>  static int scpi_probe(struct platform_device *pdev)
>  {
>  	int count, idx, ret;
> @@ -991,6 +996,9 @@ static int scpi_probe(struct platform_device *pdev)
>  	if (!scpi_info)
>  		return -ENOMEM;
>
> +	if (of_match_device(legacy_scpi_of_match, &pdev->dev))
> +		scpi_info->is_legacy = true;
> +
>  	count = of_count_phandle_with_args(np, "mboxes", "#mbox-cells");
>  	if (count < 0) {
>  		dev_err(dev, "no mboxes property in '%s'\n", np->full_name);
> @@ -1097,6 +1105,7 @@ err:
>
>  static const struct of_device_id scpi_of_match[] = {
>  	{.compatible = "arm,scpi"},
> +	{.compatible = "amlogic,meson-gxbb-scpi"},

I also prefer adding "arm,legacy-scpi". So far AMLogic has followed the
legacy specification except the capabilities. You could use
"amlogic,meson-gxbb-scpi" for that and "arm,legacy-scpi" for the probe
part or we can add the use of "amlogic,meson-gxbb-scpi" later but just
document it now.

-- 
Regards,
Sudeep