linux-kernel - Re: [PATCH 7/7] usb: mtu3: add optional clock xhci_ck and frmcnt

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Message-ID: <a3691e8c93ed33a29011f716667b6963c44ac23f.camel@mediatek.com>
Date:   Fri, 7 Apr 2023 08:12:07 +0000
From:   Chunfeng Yun (云春峰) 
        <Chunfeng.Yun@...iatek.com>
To:     "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>
CC:     "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Eddie Hung (洪正鑫) 
        <Eddie.Hung@...iatek.com>,
        Tianping Fang (方天平) 
        <Tianping.Fang@...iatek.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>
Subject: Re: [PATCH 7/7] usb: mtu3: add optional clock xhci_ck and frmcnt_ck

On Mon, 2023-04-03 at 14:34 +0200, AngeloGioacchino Del Regno wrote:
> External email : Please do not click links or open attachments until
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> 
> 
> Il 03/04/23 04:52, Chunfeng Yun ha scritto:
> > Add optional clock 'xhci_ck' which is usually the same as sys_ck,
> > but
> > some SoC use two separated clocks when the controller supports dual
> > role mode;
> > Add optional clock 'frmcnt_ck' used on 4nm or advanced process SoC.
> 
> This needs more details, because from what it seems, `xhci_ck` could
> be
> a children of `sys_ck`,
No, it's not child of 'sys_ck', they are all the 125Mhz clocks.

> in which case there would be no need to add that
> to this driver, as it'd be handled by the clock API instead.
> 
> What SoC is this for?
encounter the issue on mt8195

> 
> Regards,
> Angelo
>