linux-kernel - Re: [PATCHv3 0/3] Add support for suspend clk for Exynos5422 SoC

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Message-ID: <CANAwSgT9aq123H-pO2u6iN2E8towsWUFcWDsA9TbVqP30j=10w@mail.gmail.com>
Date:   Mon, 10 Feb 2020 22:38:52 +0530
From:   Anand Moon <linux.amoon@...il.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     Linux USB Mailing List <linux-usb@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Felipe Balbi <balbi@...nel.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        linux-samsung-soc@...r.kernel.org,
        Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv3 0/3] Add support for suspend clk for Exynos5422 SoC

Hi Krzysztof,

On Mon, 10 Feb 2020 at 19:26, Krzysztof Kozlowski <krzk@...nel.org> wrote:
>
> On Mon, Feb 10, 2020 at 10:51:05AM +0000, Anand Moon wrote:
> > Long time ago I tried to add suspend clk for dwc3 phy
> > which was wrong appoch, see below.
> >
> > [0] https://lore.kernel.org/patchwork/patch/837635/
> > [1] https://lore.kernel.org/patchwork/patch/837636/
> >
>

Thanks for your review comments.

> You ignored parts of my review from these previous patches. I asked for
> describing WHY are you doing this and WHAT problem are you trying to
> solve. I asked for this multiple times. Unfortunately I cannot find the
> answers to my questions in this patchset...
>
> Best regards,
> Krzysztof

I dont know how to resolve this issue, but I want to re-post
some of my changes back for review. let me try again.

My future goal is to add #power-domain for FSYS and FSYS2
which I am trying to resolve some issue.
Also add run-time power management for USB3 drivers.

Here is the clk diagram for FSYS clk as per Exynos5422 user manual.
[0] https://imgur.com/gallery/zAiBoyh

As per the USB 3.0 Architecture T I.

2.13.1 PHY Power Management
The SS PHY has power states P0, P1, P2, and P3, corresponding to the
SS LPM states of U0, U1, U2,and U3. In the P3 state,SS PHY does not drive
the default functional clock,instead, the *susp_clk* is used in its place.

So enable the suspend clk help control the power management
states for the DWC3 controller.

-Anand