netdev - Re: [PATCH v2 net-next 02/10] net: ethernet: mtk_wed: move cpuboot in a dedicated dts node

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Date:   Tue, 04 Apr 2023 09:44:02 +0200
From:   Paolo Abeni <pabeni@...hat.com>
To:     Lorenzo Bianconi <lorenzo@...nel.org>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        matthias.bgg@...il.com, linux-mediatek@...ts.infradead.org,
        nbd@....name, john@...ozen.org, sean.wang@...iatek.com,
        Mark-MC.Lee@...iatek.com, lorenzo.bianconi@...hat.com,
        daniel@...rotopia.org, krzysztof.kozlowski+dt@...aro.org,
        robh+dt@...nel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v2 net-next 02/10] net: ethernet: mtk_wed: move cpuboot
 in a dedicated dts node

On Fri, 2023-03-31 at 15:12 +0200, Lorenzo Bianconi wrote:
> Since the cpuboot memory region is not part of the RAM MT7986 SoC,
> move cpuboot in a deidicated syscon node.
> Keep backward-compatibility with older dts version where cpuboot was
> defined as reserved-memory child node.
> 
> Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
> ---
>  drivers/net/ethernet/mediatek/mtk_wed_mcu.c | 34 +++++++++++++++++----
>  drivers/net/ethernet/mediatek/mtk_wed_wo.h  |  3 +-
>  2 files changed, 30 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/net/ethernet/mediatek/mtk_wed_mcu.c b/drivers/net/ethernet/mediatek/mtk_wed_mcu.c
> index 6624f6d6abdd..797c3b412ab6 100644
> --- a/drivers/net/ethernet/mediatek/mtk_wed_mcu.c
> +++ b/drivers/net/ethernet/mediatek/mtk_wed_mcu.c
> @@ -18,12 +18,23 @@
>  
>  static u32 wo_r32(struct mtk_wed_wo *wo, u32 reg)
>  {
> -	return readl(wo->boot.addr + reg);
> +	u32 val;
> +
> +	if (!wo->boot_regmap)
> +		return readl(wo->boot.addr + reg);
> +
> +	if (regmap_read(wo->boot_regmap, reg, &val))
> +		val = ~0;
> +
> +	return val;
>  }
>  
>  static void wo_w32(struct mtk_wed_wo *wo, u32 reg, u32 val)
>  {
> -	writel(val, wo->boot.addr + reg);
> +	if (wo->boot_regmap)
> +		regmap_write(wo->boot_regmap, reg, val);
> +	else
> +		writel(val, wo->boot.addr + reg);

Very minor nit: it would be more consistent with the read function
above if you invert the 2 branches, e.g.:

	if (!wo->boot_regmap)
		writel(val, wo->boot.addr + reg);
	else
		regmap_write(wo->boot_regmap, reg, val);

No need to repost just for the above, just take into consideration if a
new version will be needed for other reasons (DT)

Cheers,

Paolo