linux-kernel - Re: [PATCH] dt-bindings: phy: qcom-qusb2: Fix defaults

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Date:   Fri, 24 Apr 2020 17:52:13 -0500
From:   Rob Herring <robh@...nel.org>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        Sandeep Maheswaram <sanm@...eaurora.org>, mka@...omium.org,
        Manu Gautam <mgautam@...eaurora.org>,
        linux-arm-msm@...r.kernel.org,
        Douglas Anderson <dianders@...omium.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Stephen Boyd <swboyd@...omium.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: phy: qcom-qusb2: Fix defaults

On Thu, 23 Apr 2020 11:10:27 -0700, Douglas Anderson wrote:
> The defaults listed in the bindings don't match what the code is
> actually doing.  Presumably existing users care more about keeping
> existing behavior the same, so change the bindings to match the code
> in Linux.
> 
> The "qcom,preemphasis-level" default has been wrong for quite a long
> time (May 2018).  The other two were recently added.
> 
> As some evidence that these values are wrong, this is from the Linux
> driver:
> - qcom,preemphasis-level: sets "PORT_TUNE1", lower 2 bits.  Driver
>   programs PORT_TUNE1 to 0x30 by default and (0x30 & 0x3) = 0.
> - qcom,bias-ctrl-value: sets "PLL_BIAS_CONTROL_2", lower 6 bits.
>   Driver programs PLL_BIAS_CONTROL_2 to 0x20 by default and (0x20 &
>   0x3f) = 0x20 = 32.
> - qcom,hsdisc-trim-value: sets "PORT_TUNE2", lower 2 bits.  Driver
>   programs PORT_TUNE2 to 0x29 by default and (0x29 & 0x3) = 1.
> 
> Fixes: 1e6f134eb67a ("dt-bindings: phy: qcom-qusb2: Add support for overriding Phy tuning parameters")
> Fixes: a8b70ccf10e3 ("dt-bindings: phy-qcom-usb2: Add support to override tuning values")
> Signed-off-by: Douglas Anderson <dianders@...omium.org>
> ---
> 
>  Documentation/devicetree/bindings/phy/qcom,qusb2-phy.yaml | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 

Applied, thanks.

Rob