linux-kernel - Re: [PATCH v3/resend 3/4] drivers: bus: Add Simple Power-Managed Bus DT Bindings

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Message-ID: <7hvbjy30an.fsf@deeprootsystems.com>
Date:	Thu, 22 Jan 2015 14:42:08 -0800
From:	Kevin Hilman <khilman@...nel.org>
To:	Geert Uytterhoeven <geert+renesas@...der.be>
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Grant Likely <grant.likely@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Olof Johansson <olof@...om.net>,
	Simon Horman <horms+renesas@...ge.net.au>,
	Magnus Damm <magnus.damm@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devicetree@...r.kernel.org, linux-sh@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3/resend 3/4] drivers: bus: Add Simple Power-Managed Bus DT Bindings

Geert Uytterhoeven <geert+renesas@...der.be> writes:

> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> Tested-by: Ulrich Hecht <ulrich.hecht+renesas@...il.com>
> ---
> v3:
>   - Add Tested-by,
>   - Document required properties inherited from "simple-bus",
>   - Document required "reg" property for "renesas,bsc",
>   - Move "ranges" before "reg" in the example,
>
> v2:
>   - New.
> ---
>  .../devicetree/bindings/bus/simple-pm-bus.txt      | 52 ++++++++++++++++++++++
>  1 file changed, 52 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/bus/simple-pm-bus.txt
>
> diff --git a/Documentation/devicetree/bindings/bus/simple-pm-bus.txt b/Documentation/devicetree/bindings/bus/simple-pm-bus.txt
> new file mode 100644
> index 0000000000000000..d03abf7fd8e3997a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/bus/simple-pm-bus.txt
> @@ -0,0 +1,52 @@
> +Simple Power-Managed Bus
> +========================
> +
> +A Simple Power-Managed Bus is a transparent bus that doesn't need a real
> +driver, as it's typically initialized by the boot loader.
> +
> +However, its bus controller is part of a PM domain, or under the control of a
> +functional clock.  Hence, the bus controller's PM domain and/or clock must be
> +enabled for child devices connected to the bus (either on-SoC or externally)
> +to function.
> +
> +
> +Generic compatible values and properties
> +----------------------------------------
> +
> +Required properties:
> +  - compatible: Must be at least one of the vendor-specific compatible values
> +		from a vendor-specific section below, and "simple-bus" as a
> +		fallback.

What happened to the idea of using something like "simple-pm-bus"?

There's nothing vendor-specific in the driver at all, so the
vendor-specific binding seem like clutter to me and will result in
continuing to add vendor-specific compatibles without any
vendor-specific code.

Kevin
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