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

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Message-ID: <af1dd205-149b-034e-5f35-727ac1d151f2@linaro.org>
Date:   Tue, 30 Aug 2022 20:32:43 +0300
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
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, 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: Re: [PATCH v1 1/1] usb: phy: mxs: apply board calibration value base
 on chip trim value

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
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Best regards,
Krzysztof