linux-kernel - Re: [PATCH v2 3/7] phy: phy-mtk-tphy: add property to set pre-emphasis

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Message-ID: <219aef5a-af2a-6873-f682-cb6aef862425@collabora.com>
Date:   Wed, 31 Aug 2022 10:14:25 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Vinod Koul <vkoul@...nel.org>, Rob Herring <robh+dt@...nel.org>
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-phy@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Eddie Hung <eddie.hung@...iatek.com>
Subject: Re: [PATCH v2 3/7] phy: phy-mtk-tphy: add property to set
 pre-emphasis

Il 29/08/22 10:08, Chunfeng Yun ha scritto:
> Add a property to set usb2 phy's pre-emphasis, it's disabled by default
> on some SoCs.
> 
> Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
> ---
> v2: no changes
> ---
>   drivers/phy/mediatek/phy-mtk-tphy.c | 10 ++++++++++
>   1 file changed, 10 insertions(+)
> 
> diff --git a/drivers/phy/mediatek/phy-mtk-tphy.c b/drivers/phy/mediatek/phy-mtk-tphy.c
> index 8ee7682b8e93..986fde0f63a0 100644
> --- a/drivers/phy/mediatek/phy-mtk-tphy.c
> +++ b/drivers/phy/mediatek/phy-mtk-tphy.c
> @@ -72,6 +72,8 @@
>   #define PA5_RG_U2_HS_100U_U3_EN	BIT(11)
>   
>   #define U3P_USBPHYACR6		0x018
> +#define PA6_RG_U2_PRE_EMP		GENMASK(31, 30)
> +#define PA6_RG_U2_PRE_EMP_VAL(x)	((0x3 & (x)) << 30)

Hello Chunfeng,

can you please clarify which SoC is this change referred to?

If I'm not missing anything, there may be a register layout conflict between
one version and the other for T-PHYs, for which, it may be a good idea to add
a PHY version check before allowing to write settings that are supported only
on a specific IP...

Regards,
Angelo