linux-kernel - RE: [EXT] Re: [PATCH v1 1/1] usb: phy: mxs: apply board calibration value base on chip trim value

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Date:   Tue, 30 Aug 2022 18:27:16 +0000
From:   Frank Li <frank.li@....com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        "kishon@...com" <kishon@...com>,
        "vkoul@...nel.org" <vkoul@...nel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "balbi@...nel.org" <balbi@...nel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-phy@...ts.infradead.org" <linux-phy@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "imx@...ts.linux.dev" <imx@...ts.linux.dev>
Subject: RE: [EXT] Re: [PATCH v1 1/1] usb: phy: mxs: apply board calibration
 value base on chip trim value



> -----Original Message-----
> From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> Sent: Tuesday, August 30, 2022 12:33 PM
> To: Frank Li <frank.li@....com>; kishon@...com; vkoul@...nel.org;
> robh+dt@...nel.org; krzysztof.kozlowski+dt@...aro.org;
> shawnguo@...nel.org; s.hauer@...gutronix.de; kernel@...gutronix.de;
> festevam@...il.com; dl-linux-imx <linux-imx@....com>; balbi@...nel.org;
> gregkh@...uxfoundation.org; linux-phy@...ts.infradead.org;
> devicetree@...r.kernel.org; linux-arm-kernel@...ts.infradead.org; linux-
> kernel@...r.kernel.org; linux-usb@...r.kernel.org; imx@...ts.linux.dev
> Subject: [EXT] Re: [PATCH v1 1/1] usb: phy: mxs: apply board calibration
> value base on chip trim value
> 
> Caution: EXT Email
> 
> On 30/08/2022 19:25, Frank Li wrote:
> > USBPHY_TRIM_OVERRIDE provide chip trim value. DTS provide board level
> > calibration data. Board level calibration data should be base on chip
> > trim value.
> >
> > For example, TXCAL45DP board level hope add +2.85% register base on
> > standard 45ohm. But chip trim value is -5.25% to get 45ohm output.
> > Actually finial TXCAL45DP should be -5.25% + 2.85% = -2.4%.
> >
> > If chip have not trim value at USBPHY_TRIM_OVERRIDE, No behavior
> change.
> > board level calibration will be applied.
> >
> > If chip have trim value at USBPHY_TRIM_OVERRIDE and no DTS board level
> > data, chip trim value will be applied.
> >
> > Signed-off-by: Frank Li <Frank.Li@....com>
> > ---
> >  drivers/usb/phy/phy-mxs-usb.c | 40
> ++++++++++++++++++++++++++++++++---
> >  1 file changed, 37 insertions(+), 3 deletions(-)
> 
> Use scripts/get_maintainers.pl to CC all maintainers and relevant
> mailing lists.... and do not Cc unrelated folks.

[Frank Li] Thanks. I reused cc list,  I sent the patch yesterday, which change the same file.
Only difference,  This patch have not touch document. 
Next time, I will rerun get_mainainers.pl.

> 
> Best regards,
> Krzysztof