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Date:   Sat, 9 May 2020 02:30:45 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.com>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] dt-bindings: power: reset: Convert
 syscon-reboot-mode to DT schema

Hi,

On Fri, May 08, 2020 at 02:38:44AM +0300, Serge Semin wrote:
> Modern device tree bindings are supposed to be created as YAML-files
> in accordance with dt-schema. This commit replaces SYSCON reboot-mode
> legacy bare text bindings with YAML file. As before the bindings file
> states that the corresponding dts node is supposed to be compatible
> "syscon-reboot-mode" device and necessarily have an offset property
> to determine which register from the regmap is supposed to keep the
> mode on reboot.
> 
> Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> Reviewed-by: Rob Herring <robh@...nel.org>
> Acked-by: Sebastian Reichel <sebastian.reichel@...labora.com>
> Cc: Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>
> Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
> Cc: Paul Burton <paulburton@...nel.org>
> Cc: Ralf Baechle <ralf@...ux-mips.org>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Allison Randal <allison@...utok.net>
> Cc: Richard Fontana <rfontana@...hat.com>
> Cc: Kate Stewart <kstewart@...uxfoundation.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: linux-mips@...r.kernel.org
> ---

Thanks, I queued this patch to power-supply's for-next branch. For the other
two patches I will wait for Rob's feedback.

-- Sebastian

>  .../power/reset/syscon-reboot-mode.txt        | 35 ------------
>  .../power/reset/syscon-reboot-mode.yaml       | 55 +++++++++++++++++++
>  2 files changed, 55 insertions(+), 35 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/power/reset/syscon-reboot-mode.txt
>  create mode 100644 Documentation/devicetree/bindings/power/reset/syscon-reboot-mode.yaml
> 
> diff --git a/Documentation/devicetree/bindings/power/reset/syscon-reboot-mode.txt b/Documentation/devicetree/bindings/power/reset/syscon-reboot-mode.txt
> deleted file mode 100644
> index f7ce1d8af04a..000000000000
> --- a/Documentation/devicetree/bindings/power/reset/syscon-reboot-mode.txt
> +++ /dev/null
> @@ -1,35 +0,0 @@
> -SYSCON reboot mode driver
> -
> -This driver gets reboot mode magic value form reboot-mode driver
> -and stores it in a SYSCON mapped register. Then the bootloader
> -can read it and take different action according to the magic
> -value stored.
> -
> -This DT node should be represented as a sub-node of a "syscon", "simple-mfd"
> -node.
> -
> -Required properties:
> -- compatible: should be "syscon-reboot-mode"
> -- offset: offset in the register map for the storage register (in bytes)
> -
> -Optional property:
> -- mask: bits mask of the bits in the register to store the reboot mode magic value,
> -  default set to 0xffffffff if missing.
> -
> -The rest of the properties should follow the generic reboot-mode description
> -found in reboot-mode.txt
> -
> -Example:
> -	pmu: pmu@...04000 {
> -		compatible = "rockchip,rk3066-pmu", "syscon", "simple-mfd";
> -		reg = <0x20004000 0x100>;
> -
> -		reboot-mode {
> -			compatible = "syscon-reboot-mode";
> -			offset = <0x40>;
> -			mode-normal = <BOOT_NORMAL>;
> -			mode-recovery = <BOOT_RECOVERY>;
> -			mode-bootloader = <BOOT_FASTBOOT>;
> -			mode-loader = <BOOT_BL_DOWNLOAD>;
> -		};
> -	};
> diff --git a/Documentation/devicetree/bindings/power/reset/syscon-reboot-mode.yaml b/Documentation/devicetree/bindings/power/reset/syscon-reboot-mode.yaml
> new file mode 100644
> index 000000000000..9b1ffceefe3d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/power/reset/syscon-reboot-mode.yaml
> @@ -0,0 +1,55 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/power/reset/syscon-reboot-mode.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Generic SYSCON reboot mode driver
> +
> +maintainers:
> +  - Sebastian Reichel <sre@...nel.org>
> +
> +description: |
> +  This driver gets reboot mode magic value from reboot-mode driver
> +  and stores it in a SYSCON mapped register. Then the bootloader
> +  can read it and take different action according to the magic
> +  value stored. The SYSCON mapped register is retrieved from the
> +  parental dt-node plus the offset. So the SYSCON reboot-mode node
> +  should be represented as a sub-node of a "syscon", "simple-mfd" node.
> +
> +properties:
> +  compatible:
> +    const: syscon-reboot-mode
> +
> +  mask:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: Update only the register bits defined by the mask (32 bit)
> +
> +  offset:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: Offset in the register map for the mode register (in bytes)
> +
> +patternProperties:
> +  "^mode-.+":
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: Vendor-specific mode value written to the mode register
> +
> +additionalProperties: false
> +
> +required:
> +  - compatible
> +  - offset
> +
> +examples:
> +  - |
> +    #include <dt-bindings/soc/rockchip,boot-mode.h>
> +
> +    reboot-mode {
> +      compatible = "syscon-reboot-mode";
> +      offset = <0x40>;
> +      mode-normal = <BOOT_NORMAL>;
> +      mode-recovery = <BOOT_RECOVERY>;
> +      mode-bootloader = <BOOT_FASTBOOT>;
> +      mode-loader = <BOOT_BL_DOWNLOAD>;
> +    };
> +...
> -- 
> 2.25.1
> 

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