linux-kernel - RE: [EXT] Re: [PATCH v2 1/3] dt-bindings: usb: cdns-imx8qm: add imx8qm cdns3 glue bindings

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Date:   Mon, 20 Mar 2023 19:59:36 +0000
From:   Frank Li <frank.li@....com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>
CC:     "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "festevam@...il.com" <festevam@...il.com>,
        "imx@...ts.linux.dev" <imx@...ts.linux.dev>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        dl-linux-imx <linux-imx@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>
Subject: RE: [EXT] Re: [PATCH v2 1/3] dt-bindings: usb: cdns-imx8qm: add
 imx8qm cdns3 glue bindings

> 
> The second is a good example - as you can see, there is a choice of
> values, so they are not exactly fixed.
> 
> >
> > Such frequency information is necessary.  We can put to dts or clock drivers.
> The clock driver
> 
> If this is the argument, then the answer is NAK. Sorry, but DTS is not
> for offloading fixed stuff just because you do not want to work on
> drivers. The same for discoverable stuff.
> 
> > Become bigger, or dts become bigger.  I think the key point is if property to
> descript hardware information.
> 
> You have to understand that with your binding you are not allowing to
> any changes of these frequencies.

Do you means it should be okay if one of  clocks is not fixed?

Previous owner already left nxp.  I double checked our documents and scfw source code. 
I miss understood a clock SC_PM_CLK_MST_BUS, which actually mapped to IP's aclk, which
ware 100Mhz to 600Mhz. 

> 
> Best regards,
> Krzysztof