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SubjectRe: [PATCH 3/3] dt-bindings: mfd: add "syscon-smc" YAML description
On Fri, Jul 23, 2021 at 03:52:39PM +0200, Clément Léger wrote:
> This patch adds documentation for the "syscon-smc" compatible which describes
> a syscon using a SMC regmap instead of a MMIO one. This allows accessing system
> controllers that are set as secure by using SMC handled by the secure monitor.
>
> Signed-off-by: Clément Léger <clement.leger@bootlin.com>
> ---
> .../devicetree/bindings/mfd/syscon-smc.yaml | 57 +++++++++++++++++++
> 1 file changed, 57 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/mfd/syscon-smc.yaml
>
> diff --git a/Documentation/devicetree/bindings/mfd/syscon-smc.yaml b/Documentation/devicetree/bindings/mfd/syscon-smc.yaml
> new file mode 100644
> index 000000000000..6ce1392c5e7f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mfd/syscon-smc.yaml
> @@ -0,0 +1,57 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mfd/syscon-smc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: System Controller Registers R/W via SMC Device Tree Bindings
> +
> +description: |
> + System controller SMC node represents a register region containing a set
> + of miscellaneous registers accessed through a secure monitor.
> + The typical use-case is the same as the syscon one but when running with a
> + secure monitor.
> +
> +maintainers:
> + - Lee Jones <lee.jones@linaro.org>
> +
> +properties:
> + compatible:
> + anyOf:
> + - items:
> + - enum:
> + - atmel,sama5d2-sfr
> +
> + - const: syscon-smc

I regret having 'syscon' as a compatible, so nak on a 2nd flavor of it.
It's only purpose is a hint to Linux to automagically create a regmap for
you.

All you need is the specific compatible, atmel,sama5d2-sfr, and you can
imply the rest of this from it. That's assuming the conclusion is a
register read/write interface on SMC is a good idea, but I don't think
it is.

Rob

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