From patchwork Mon Apr 3 23:30:24 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jaghathiswari Rankappagounder Natarajan X-Patchwork-Id: 9660707 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 2F4A76032D for ; Mon, 3 Apr 2017 23:30:59 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 20E6D28494 for ; Mon, 3 Apr 2017 23:30:59 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 134D7284BA; Mon, 3 Apr 2017 23:30:59 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=2.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, RCVD_IN_DNSWL_HI, T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A73F828494 for ; Mon, 3 Apr 2017 23:30:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752502AbdDCXa4 (ORCPT ); Mon, 3 Apr 2017 19:30:56 -0400 Received: from mail-pg0-f52.google.com ([74.125.83.52]:35875 "EHLO mail-pg0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752062AbdDCXad (ORCPT ); Mon, 3 Apr 2017 19:30:33 -0400 Received: by mail-pg0-f52.google.com with SMTP id g2so132874345pge.3 for ; Mon, 03 Apr 2017 16:30:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=10/oAIeKkQP9riZEzrx8VwyExk73kIYjP0NVNv0+yM4=; b=H+xpp/EZYnmETgivNTwj7A5GP2z4zek5thKx51uKWvEcXixicB8HzcZ+yCDEKtwRUw pfWtpAESbLiiUEIV272tHFWmGJzjnlT16KJfVM01aZoy5t1Gu45hy1W8UY+euZtiwkcu yLa5vmbcMNmDxHi5xZIVVSAJS0gBKU0MAGa14IO7MWslbs7GYrz35Hl56awIEBh/l0+B YPTWzxI3FfDPM4iOux0cCn48BK5b4SddhSLgEc97Xbawe/fCFeONEnWh7YtBMw1PeM4G cUn2CMqsgJSaDSBFgjIkPw70+yRhUobHsxhNWfk1ggJUY9UEyLn4lvncNsS7oLXW8sm3 Kq5g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=10/oAIeKkQP9riZEzrx8VwyExk73kIYjP0NVNv0+yM4=; b=skqy6VQxkW/MoEe9vOMDTyAucJFH5DHYZB/v8laoKt0k/EjPG9ix1JZhE7ph0h/bkL 1nKQdLhLBGVCnFlxWAnwmDvCspfi33Ifvsb8U9ct7GFSsmdxdyKTEfMh6/X2lfjQHCYm EHA/2l5uOJIQhXAdOhUfRtLaGnnQkaqm+iFN/EqcG6lP8JPxE+wRVwkmcUVGDTbfbdTU P+tvAGci9mG5GwcHCEOzWL7UT+x3XvN+29mwDIqAtePucG/G+ng9ax3gy/2m749pgDVJ pqt4FjGIasMK3Hg7Pxbi21JXNYN3McXaj4M71lGavUDt+e+OKbEjyFjVpGE776mG6Dlg H3eA== X-Gm-Message-State: AFeK/H21aatqp484hnjeZ1KI/ssZGfJKnfMbKrxBWJz3UYTPtMlKsE0qhC/QxbkRBICsUGWa X-Received: by 10.84.254.5 with SMTP id b5mr25103338plm.76.1491262231205; Mon, 03 Apr 2017 16:30:31 -0700 (PDT) Received: from jaghu22.svl.corp.google.com ([100.123.242.38]) by smtp.gmail.com with ESMTPSA id 140sm27788643pfa.58.2017.04.03.16.30.30 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 03 Apr 2017 16:30:30 -0700 (PDT) From: Jaghathiswari Rankappagounder Natarajan To: joel@jms.id.au, jdelvare@suse.com, linux@roeck-us.net, linux-hwmon@vger.kernel.org, linux-kernel@vger.kernel.org, openbmc@lists.ozlabs.org, corbet@lwn.net, linux-doc@vger.kernel.org, robh+dt@kernel.org, mark.rutland@arm.com, devicetree@vger.kernel.org Cc: Jaghathiswari Rankappagounder Natarajan Subject: [PATCH linux v6 1/2] Documentation: dt-bindings: Document bindings for ASPEED AST2400/AST2500 PWM and Fan tach controller device driver Date: Mon, 3 Apr 2017 16:30:24 -0700 Message-Id: <20170403233025.26952-2-jaghu@google.com> X-Mailer: git-send-email 2.12.2.715.g7642488e1d-goog In-Reply-To: <20170403233025.26952-1-jaghu@google.com> References: <20170403233025.26952-1-jaghu@google.com> Sender: linux-hwmon-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-hwmon@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This binding provides interface for adding values related to ASPEED AST2400/2500 PWM and Fan tach controller support. The PWM controller can support upto 8 PWM output ports. The Fan tach controller can support upto 16 tachometer inputs. Signed-off-by: Jaghathiswari Rankappagounder Natarajan --- v6: - Changed to aspeed,fan-tach-ch v5: - Changed the naming scheme to aspeed,ast2400/2500-pwm-tacho - Removed gpio pin muxing - Added aspeed vendor prefix for fan-tach-ch - Changed to fan@0/1 - Changed reg to 32 bits v4: - Used 'reg' v3: - Made the structure more common v2: - Removed '_' in node and property names - Gave some explanation for the properties used .../devicetree/bindings/hwmon/aspeed-pwm-tacho.txt | 68 ++++++++++++++++++++++ 1 file changed, 68 insertions(+) create mode 100644 Documentation/devicetree/bindings/hwmon/aspeed-pwm-tacho.txt -- 2.12.2.715.g7642488e1d-goog -- To unsubscribe from this list: send the line "unsubscribe linux-hwmon" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/Documentation/devicetree/bindings/hwmon/aspeed-pwm-tacho.txt b/Documentation/devicetree/bindings/hwmon/aspeed-pwm-tacho.txt new file mode 100644 index 000000000000..ac0a69ab0755 --- /dev/null +++ b/Documentation/devicetree/bindings/hwmon/aspeed-pwm-tacho.txt @@ -0,0 +1,68 @@ +ASPEED AST2400/AST2500 PWM and Fan Tacho controller device driver + +The ASPEED PWM controller can support upto 8 PWM outputs. The ASPEED Fan Tacho +controller can support upto 16 Fan tachometer inputs. + +There can be upto 8 fans supported. Each fan can have one PWM output and +one/two Fan tach inputs. + +Required properties for pwm-tacho node: +- #address-cells : should be 1. + +- #size-cells : should be 1. + +- reg : address and length of the register set for the device. + +- pinctrl-names : a pinctrl state named "default" must be defined. + +- pinctrl-0 : phandle referencing pin configuration of the PWM ports. + +- compatible : should be "aspeed,ast2400-pwm-tacho" for AST2400 and + "aspeed,ast2500-pwm-tacho" for AST2500. + +- clocks : a fixed clock providing input clock frequency(PWM + and Fan Tach clock) + +fan subnode format: +=================== +Under fan subnode there can upto 8 child nodes, with each child node +representing a fan. If there are 8 fans each fan can have one PWM port and +one/two Fan tach inputs. + +Required properties for each child node: +- reg : should specify PWM source port. + integer value in the range 0 to 7 with 0 indicating PWM port A and + 7 indicating PWM port H. + +- aspeed,fan-tach-ch : should specify the Fan tach input channel. + integer value in the range 0 through 15, with 0 indicating + Fan tach channel 0 and 15 indicating Fan tach channel 15. + Atleast one Fan tach input channel is required. + +Examples: + +pwm_tacho_fixed_clk: fixedclk { + compatible = "fixed-clock"; + #clock-cells = <0>; + clock-frequency = <24000000>; +} + +pwm_tacho: pwmtachocontroller@1e786000 { + #address-cells = <1>; + #size-cells = <1>; + reg = <0x1E786000 0x1000>; + compatible = "aspeed,ast2500-pwm-tacho"; + clocks = <&pwm_tacho_fixed_clk>; + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_pwm0_default &pinctrl_pwm1_default>; + + fan@0 { + reg = <0x00>; + aspeed,fan-tach-ch = /bits/ 8 <0x00>; + }; + + fan@1 { + reg = <0x01>; + aspeed,fan-tach-ch = /bits/ 8 <0x01 0x02>; + }; +};