Re: [PATCH v2 1/3] dt-bindings: power: reset: Convert syscon-reboot-mode to DT schema

Sebastian Reichel
2020-05-09T00:30:50Z

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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@baikalelectronics.ru>
> Reviewed-by: Rob Herring <robh@kernel.org>
> Acked-by: Sebastian Reichel <sebastian.reichel@collabora.com>
> Cc: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>
> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
> Cc: Paul Burton <paulburton@kernel.org>
> Cc: Ralf Baechle <ralf@linux-mips.org>
> Cc: Arnd Bergmann <arnd@arndb.de>
> Cc: Allison Randal <allison@lohutok.net>
> Cc: Richard Fontana <rfontana@redhat.com>
> Cc: Kate Stewart <kstewart@linuxfoundation.org>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: linux-mips@vger.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@20004000 {
> - 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@kernel.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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