From patchwork Thu Sep 25 16:28:31 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Geert Uytterhoeven X-Patchwork-Id: 393400 Return-Path: X-Original-To: incoming-dt@patchwork.ozlabs.org Delivered-To: patchwork-incoming-dt@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3793B1400B5 for ; Fri, 26 Sep 2014 02:32:59 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754143AbaIYQbj (ORCPT ); Thu, 25 Sep 2014 12:31:39 -0400 Received: from michel.telenet-ops.be ([195.130.137.88]:59472 "EHLO michel.telenet-ops.be" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753377AbaIYQ2x (ORCPT ); Thu, 25 Sep 2014 12:28:53 -0400 Received: from ayla.of.borg ([84.193.84.167]) by michel.telenet-ops.be with bizsmtp id vUUn1o00k3cczKo06UUnyX; Thu, 25 Sep 2014 18:28:52 +0200 Received: from ramsan.of.borg ([192.168.97.29] helo=ramsan) by ayla.of.borg with esmtp (Exim 4.76) (envelope-from ) id 1XXBuR-0003Xs-6z; Thu, 25 Sep 2014 18:28:47 +0200 Received: from geert by ramsan with local (Exim 4.82) (envelope-from ) id 1XXBuS-0005wl-24; Thu, 25 Sep 2014 18:28:48 +0200 From: Geert Uytterhoeven To: "Rafael J. Wysocki" , Simon Horman , Magnus Damm Cc: Ulf Hansson , Tomasz Figa , Philipp Zabel , Grygorii Strashko , Kevin Hilman , linux-sh@vger.kernel.org, linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Geert Uytterhoeven Subject: [PATCH v3 04/13] PM / Domains: Add DT bindings for the R-Mobile System Controller Date: Thu, 25 Sep 2014 18:28:31 +0200 Message-Id: <1411662520-22795-5-git-send-email-geert+renesas@glider.be> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1411662520-22795-1-git-send-email-geert+renesas@glider.be> References: <1411662520-22795-1-git-send-email-geert+renesas@glider.be> Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org The Renesas R-Mobile System Controller provides a.o. power management support, following the generic PM domain bindings in Documentation/devicetree/bindings/power/power_domain.txt. For now this supports the R-Mobile A1 (r8a7740) only, but it should be sufficiently generic to handle other members of the SH-Mobile/R-Mobile family in the future. Signed-off-by: Geert Uytterhoeven --- v3: - Reword, v2: - Fix copy-and-paste s/#address-cells/#size-cells/, - Add optional PM QoS device latencies. .../bindings/power/renesas,sysc-rmobile.txt | 111 +++++++++++++++++++++ 1 file changed, 111 insertions(+) create mode 100644 Documentation/devicetree/bindings/power/renesas,sysc-rmobile.txt diff --git a/Documentation/devicetree/bindings/power/renesas,sysc-rmobile.txt b/Documentation/devicetree/bindings/power/renesas,sysc-rmobile.txt new file mode 100644 index 0000000000000000..0b1e56d6ed1ab9a2 --- /dev/null +++ b/Documentation/devicetree/bindings/power/renesas,sysc-rmobile.txt @@ -0,0 +1,111 @@ +DT bindings for the Renesas R-Mobile System Controller + +== System Controller Node == + +The R-Mobile System Controller provides the following functions: + - Boot mode management, + - Reset generation, + - Power management. + +Required properties: +- compatible: Should be "renesas,sysc-", "renesas,sysc-rmobile" as + fallback. + Examples with soctypes are: + - "renesas,sysc-r8a7740" (R-Mobile A1) +- reg: Two address start and address range blocks for the device: + - The first block refers to the normally accessible registers, + - the second block refers to the registers protected by the HPB + semaphore. + +Optional nodes: +- pm-domains: This node contains a hierarchy of PM domain nodes, which should + match the Power Area Hierarchy in the Power Domain Specifications section of + the device's datasheet. + + +== PM Domain Nodes == + +Each of the PM domain nodes represents a PM domain, as documented by the +generic PM domain bindings in +Documentation/devicetree/bindings/power/power_domain.txt. + +The nodes should be named by the real power area names, and thus their names +should be unique. + +Required properties: + - #power-domain-cells: Must be 0. + +Optional properties: +- reg: If the PM domain is not always-on, this property must contain the bit + index number for the corresponding power area in the various Power + Control and Status Registers. The parent's node must contain the + following two properties: + - #address-cells: Must be 1, + - #size-cells: Must be 0. + If the PM domain is always-on, this property must be omitted. +- power-on-latency: Power-on latency of the PM domain, in ns, +- power-off-latency: Power-off latency of the PM domain, in ns. + + +Example: + +This shows a subset of the r8a7740 PM domain hierarchy, containing the +C5 "always-on" domain, 2 of its subdomains (A4S and A4SU), and the A3SP domain, +which is a subdomain of A4S. + + sysc: system-controller@e6180000 { + compatible = "renesas,sysc-r8a7740", "renesas,sysc-rmobile"; + reg = <0xe6180000 8000>, <0xe6188000 8000>; + + pm-domains { + pd_c5: c5 { + #address-cells = <1>; + #size-cells = <0>; + #power-domain-cells = <0>; + + pd_a4s: a4s@10 { + reg = <10>; + #address-cells = <1>; + #size-cells = <0>; + #power-domain-cells = <0>; + power-on-latency = <250000>; + power-off-latency = <250000>; + + pd_a3sp: a3sp@11 { + reg = <11>; + #power-domain-cells = <0>; + power-on-latency = <250000>; + power-off-latency = <250000>; + }; + }; + + pd_a4su: a4su@20 { + reg = <20>; + #power-domain-cells = <0>; + power-on-latency = <250000>; + power-off-latency = <250000>; + }; + }; + }; + }; + + +== PM Domain Consumers == + +Hardware blocks belonging to a PM domain should contain a "power-domains" +property that is a phandle pointing to the corresponding PM domain node, +and optional PM QoS device latencies: + +Example: + + tpu: pwm@e6600000 { + compatible = "renesas,tpu-r8a7740", "renesas,tpu"; + reg = <0xe6600000 0x100>; + clocks = <&mstp3_clks R8A7740_CLK_TPU0>; + power-domains = <&pd_a3sp>; + stop-latency = <250000>; + start-latency = <250000>; + save-state-latency = <250000>; + restore-state-latency = <250000>; + #pwm-cells = <3>; + };