linux-kernel - Re: [PATCH 0/6] usb: dwc3: Calculate REFCLKPER et. al. from reference clock

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Message-ID: <87iluifxy1.fsf@tarshish>
Date:   Mon, 17 Jan 2022 12:36:25 +0200
From:   Baruch Siach <baruch@...s.co.il>
To:     Sean Anderson <sean.anderson@...o.com>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Robert Hancock <robert.hancock@...ian.com>,
        Felipe Balbi <balbi@...nel.org>,
        Balaji Prakash J <bjagadee@...eaurora.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Michal Simek <michal.simek@...inx.com>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH 0/6] usb: dwc3: Calculate REFCLKPER et. al. from
 reference clock

Hi Sean, Thinh,

On Fri, Jan 14 2022, Sean Anderson wrote:
> This is a rework of patches 3-5 of [1]. It attempts to correctly program
> REFCLKPER and REFCLK_FLADJ based on the reference clock frequency. Since
> we no longer need a special property duplicating this configuration,
> snps,ref-clock-period-ns is deprecated.
>
> Please test this! Patches 3/4 in this series have the effect of
> programming REFCLKPER and REFCLK_FLADJ on boards which already configure
> the "ref" clock. I have build tested, but not much else.
>
> [1] https://lore.kernel.org/linux-usb/20220114044230.2677283-1-robert.hancock@calian.com/

Thinh, you suggested the dedicated DT property for the reference clock:

  https://lore.kernel.org/all/d5acb192-80b9-36f7-43f5-81f21c4e6ba0@synopsys.com/

Can you comment on this series?

Thanks,
baruch

> Sean Anderson (6):
>   dt-bindings: usb: dwc3: Deprecate snps,ref-clock-period-ns
>   usb: dwc3: Get clocks individually
>   usb: dwc3: Calculate REFCLKPER based on reference clock
>   usb: dwc3: Handle fractional reference clocks
>   arm64: dts: zynqmp: Move USB clocks to dwc3 node
>   arm64: dts: ipq6018: Use reference clock to set dwc3 period
>
>  .../devicetree/bindings/usb/snps,dwc3.yaml    |  7 +-
>  arch/arm64/boot/dts/qcom/ipq6018.dtsi         |  3 +-
>  .../arm64/boot/dts/xilinx/zynqmp-clk-ccf.dtsi |  4 +-
>  arch/arm64/boot/dts/xilinx/zynqmp.dtsi        |  4 +-
>  drivers/usb/dwc3/core.c                       | 98 ++++++++++++++++---
>  drivers/usb/dwc3/core.h                       |  6 +-
>  6 files changed, 98 insertions(+), 24 deletions(-)


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