linux-kernel - Re: [PATCH 1/2] power: reset: Add qcom reboot mode driver

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Message-ID: <CALAqxLXL+AHwchp8Ja2NAXt-=0xd87ojA4AGzT-n0oQFbwcCzw@mail.gmail.com>
Date:   Thu, 13 Oct 2016 20:25:11 -0700
From:   John Stultz <john.stultz@...aro.org>
To:     Xiaogang Cui <xiaogang@...eaurora.org>
Cc:     Andy Gross <andy.gross@...aro.org>,
        Sebastian Reichel <sre@...nel.org>,
        Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Andy Yan <andy.yan@...k-chips.com>,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
        Nicolas Ferre <nicolas.ferre@...el.com>,
        Chris Brand <chris.brand@...adcom.com>,
        Richard Weinberger <richard@....at>,
        Moritz Fischer <moritz.fischer@...us.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "open list:POWER SUPPLY CLASS/SUBSYSTEM and DRIVERS" 
        <linux-pm@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] power: reset: Add qcom reboot mode driver

On Thu, Oct 13, 2016 at 7:02 PM, Xiaogang Cui <xiaogang@...eaurora.org> wrote:
> This is a initial version so it's very similar with syscon
> reboot mode driver. We will add more functionalities in the
> further after dependency is ready.
>
> Signed-off-by: Xiaogang Cui <xiaogang@...eaurora.org>
> ---
>  .../bindings/power_supply/qcom-reboot-mode.txt     |  23 +++++
>  drivers/power/reset/Kconfig                        |  10 ++
>  drivers/power/reset/Makefile                       |   1 +
>  drivers/power/reset/qcom-reboot-mode.c             | 109 +++++++++++++++++++++
>  4 files changed, 143 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/power_supply/qcom-reboot-mode.txt
>  create mode 100644 drivers/power/reset/qcom-reboot-mode.c
>
> diff --git a/Documentation/devicetree/bindings/power_supply/qcom-reboot-mode.txt b/Documentation/devicetree/bindings/power_supply/qcom-reboot-mode.txt
> new file mode 100644
> index 0000000..8b33592
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/power_supply/qcom-reboot-mode.txt
> @@ -0,0 +1,23 @@
> +Qualcomm Reboot Mode Driver
> +
> +Qualcomm reboot mode driver based on reboot mode framework to update
> +SPMI specific bits.
> +
> +Required Properties:
> +-compatible: "qcom,reboot-mode"
> +-offset: offset of the SPMI reboot mode register
> +
> +Optional Properties:
> +-mask: mask of reboot mode
> +-mode-xxx: magic of reboot mode
> +
> +Example:
> +       qcom,reboot-mode@88f {
> +               compatible = "qcom,reboot-mode";
> +               offset = <0x88f>;
> +               mode-normal = <0x00>;
> +               mode-recovery = <0x04>;
> +               mode-bootloader = <0x08>;
> +               mode-rtc = <0x0C>;

So I don't think we've had a "rtc" mode before. This needs to be very
clearly documented (or maybe just skipped) so we don't start fraying
with all the various vendor specific modes.

thanks
-john