From patchwork Fri Jan 9 13:12:34 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Geert Uytterhoeven X-Patchwork-Id: 5599951 X-Patchwork-Delegate: geert@linux-m68k.org Return-Path: X-Original-To: patchwork-linux-sh@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 16EF7C058D for ; Fri, 9 Jan 2015 13:12:43 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 3064620574 for ; Fri, 9 Jan 2015 13:12:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0065020571 for ; Fri, 9 Jan 2015 13:12:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756925AbbAINMk (ORCPT ); Fri, 9 Jan 2015 08:12:40 -0500 Received: from baptiste.telenet-ops.be ([195.130.132.51]:57573 "EHLO baptiste.telenet-ops.be" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756591AbbAINMi (ORCPT ); Fri, 9 Jan 2015 08:12:38 -0500 Received: from ayla.of.borg ([84.193.93.87]) by baptiste.telenet-ops.be with bizsmtp id dpCc1p0051t5w8s01pCcX9; Fri, 09 Jan 2015 14:12:37 +0100 Received: from ramsan.of.borg ([192.168.97.29] helo=ramsan) by ayla.of.borg with esmtp (Exim 4.82) (envelope-from ) id 1Y9ZMh-0007WU-R0; Fri, 09 Jan 2015 14:12:35 +0100 Received: from geert by ramsan with local (Exim 4.82) (envelope-from ) id 1Y9ZMk-00013f-E1; Fri, 09 Jan 2015 14:12:38 +0100 From: Geert Uytterhoeven To: Simon Horman , Magnus Damm Cc: Arnd Bergmann , Kevin Hilman , Greg Kroah-Hartman , linux-sh@vger.kernel.org, devicetree@vger.kernel.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Geert Uytterhoeven Subject: [PATCH v3 3/4] drivers: bus: Add Simple Power-Managed Bus DT Bindings Date: Fri, 9 Jan 2015 14:12:34 +0100 Message-Id: <1420809155-4015-4-git-send-email-geert+renesas@glider.be> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1420809155-4015-1-git-send-email-geert+renesas@glider.be> References: <1420809155-4015-1-git-send-email-geert+renesas@glider.be> Sender: linux-sh-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-sh@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Signed-off-by: Geert Uytterhoeven Tested-by: Ulrich Hecht --- 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. + - #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. + + +Vendor-specific compatible values and properties +------------------------------------------------ + +Renesas Bus State Controller (BSC): + - compatible: Must be an SoC-specific value, and "renesas,bsc" as a fallback. + SoC-specific values can be: + "renesas,bsc-r8a73a4" for R-Mobile APE6 (r8a73a4) + "renesas,bsc-sh73a0" for SH-Mobile AG5 (sh73a0) + - reg: Must contain the base address and length to access the bus controller. + - interrupts: Must contain a reference to the BSC interrupt, if available. + + +Example: + + bsc: bus@fec10000 { + compatible = "renesas,bsc-sh73a0", "renesas,bsc", "simple-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>; + };