linux-kernel - [PATCH v5 3/5] drivers: bus: Add Simple Power-Managed Bus DT Bindings

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Message-Id: <1423131088-7835-4-git-send-email-geert+renesas@glider.be>
Date:	Thu,  5 Feb 2015 11:11:26 +0100
From:	Geert Uytterhoeven <geert+renesas@...der.be>
To:	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>,
	Kevin Hilman <khilman@...nel.org>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Felipe Balbi <balbi@...com>
Cc:	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,
	Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH v5 3/5] drivers: bus: Add Simple Power-Managed Bus DT Bindings

Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
Tested-by: Ulrich Hecht <ulrich.hecht+renesas@...il.com>
Reviewed-by: Kevin Hilman <khilman@...aro.org>
---
v5:
  - Add Reviewed-by,
  - "simple-pm-bus" is not an extension of "simple-bus",
  - "compatible" must not contain "simple-bus",
  - Add reference to clock/PM domain provider binding docs,

v4:
  - Replace "simple-bus" by "simple-pm-bus",
  - Remove the "renesas,bsc" bindings. They will be specified in a
    separate document.

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      | 44 ++++++++++++++++++++++
 1 file changed, 44 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..d032237512c271f2
--- /dev/null
+++ b/Documentation/devicetree/bindings/bus/simple-pm-bus.txt
@@ -0,0 +1,44 @@
+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.
+
+While "simple-pm-bus" follows the "simple-bus" set of properties, as specified
+in ePAPR, it is not an extension of "simple-bus".
+
+
+Required properties:
+  - compatible: Must contain at least "simple-pm-bus".
+		Must not contain "simple-bus".
+		It's recommended to let this be preceded by one or more
+		vendor-specific compatible values.
+  - #address-cells, #size-cells, ranges: Must describe the mapping between
+		parent address and child address spaces.
+
+Optional platform-specific properties for clock or PM domain control (at least
+one of them is required):
+  - clocks: Must contain a reference to the functional clock(s),
+  - power-domains: Must contain a reference to the PM domain.
+Please refer to the binding documentation for the clock and/or PM domain
+providers for more details.
+
+
+Example:
+
+	bsc: bus@...10000 {
+		compatible = "renesas,bsc-sh73a0", "renesas,bsc",
+			     "simple-pm-bus";
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges = <0 0 0x20000000>;
+		reg = <0xfec10000 0x400>;
+		interrupts = <0 39 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&zb_clk>;
+		power-domains = <&pd_a4s>;
+	};
-- 
1.9.1

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