linux-kernel - Re: [RESEND PATCH v1 2/4] dt-bindings: power: reset: Add alternate reboot mode format

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Message-ID: <20200825212521.GA1346433@bogus>
Date:   Tue, 25 Aug 2020 15:25:21 -0600
From:   Rob Herring <robh@...nel.org>
To:     Elliot Berman <eberman@...eaurora.org>
Cc:     Sebastian Reichel <sre@...nel.org>,
        Andy Yan <andy.yan@...k-chips.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Gross <agross@...nel.org>, linux-pm@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Trilok Soni <tsoni@...eaurora.org>,
        Prasad Sodagudi <psodagud@...eaurora.org>
Subject: Re: [RESEND PATCH v1 2/4] dt-bindings: power: reset: Add alternate
 reboot mode format

On Tue, Aug 18, 2020 at 11:54:14AM -0700, Elliot Berman wrote:
> Current reboot-mode device tree schema does not support reboot commands
> with spaces in them [1]. Add an optional new node "reboot-mode-names"
> and "reboot-mode-magic" which add an array of strings and u32s,
> respectively which would permit any string in this framework.

Kind of a weak justification. The intent was for the names to be a key, 
not a multi word description which your example seems to be. Is 
"dm-verity device corrupted" something Android has already standardized 
on?

> 
> [1]:
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/md/dm-verity-target.c?h=v5.5#n255
> 
> Signed-off-by: Elliot Berman <eberman@...eaurora.org>
> ---
>  .../devicetree/bindings/power/reset/reboot-mode.yaml    | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/power/reset/reboot-mode.yaml b/Documentation/devicetree/bindings/power/reset/reboot-mode.yaml
> index a6c9102..4ea6b33 100644
> --- a/Documentation/devicetree/bindings/power/reset/reboot-mode.yaml
> +++ b/Documentation/devicetree/bindings/power/reset/reboot-mode.yaml
> @@ -19,6 +19,9 @@ description: |
>    the bootloader what to do when the system reboots, and should be named
>    as mode-xxx = <magic> (xxx is mode name, magic should be a non-zero value).
>  
> +  reboot-mode-magic and reboot-mode-names may be used in addition/instead of
> +  mode-xxx style.

It should be either/or in my opinion, not both.

> +
>    For example, modes common Android platform are:
>      - normal: Normal reboot mode, system reboot with command "reboot".
>      - recovery: Android Recovery mode, it is a mode to format the device or update a new image.
> @@ -32,6 +35,14 @@ properties:
>        description: |
>          Default value to set on a reboot if no command was provided.
>  
> +  reboot-mode-names:
> +    $ref: /schemas/types.yaml#/definitions/string-array
> +    description: List of reboot commands, paired with reboot-mode-magic by index
> +
> +  reboot-mode-magic:

'reboot-modes' would align with normal patterns.

> +    $ref: /schemas/types.yaml#/definitions/uint32-array
> +    description: List of reboot magic, paired with reboot-mode-names by index
> +
>  patternProperties:
>    "^mode-.*$":
>      $ref: /schemas/types.yaml#/definitions/uint32
> @@ -44,4 +55,10 @@ examples:
>        mode-bootloader = <2>;
>        mode-loader = <3>;
>      };
> +
> +  - |
> +    reboot-mode {
> +      reboot-mode-names = "normal", "bootloader", "dm-verity device corrupted";
> +      reboot-mode-magic = <0x0>, <0x1>, <0xf>;
> +    };
>  ...
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>