From patchwork Fri Jun 1 18:21:36 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jae Hyun Yoo X-Patchwork-Id: 924283 Return-Path: X-Original-To: incoming-dt@patchwork.ozlabs.org Delivered-To: patchwork-incoming-dt@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=devicetree-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=linux.intel.com Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 40yCN16R3yz9s1w for ; Sat, 2 Jun 2018 04:21:53 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753271AbeFASVu (ORCPT ); Fri, 1 Jun 2018 14:21:50 -0400 Received: from mga14.intel.com ([192.55.52.115]:14473 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753445AbeFASVk (ORCPT ); Fri, 1 Jun 2018 14:21:40 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 01 Jun 2018 11:21:40 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.49,467,1520924400"; d="scan'208";a="43985073" Received: from maru.jf.intel.com ([10.54.51.80]) by fmsmga007.fm.intel.com with ESMTP; 01 Jun 2018 11:21:38 -0700 From: Jae Hyun Yoo To: Jason M Biils , Rob Herring , Mark Rutland , Joel Stanley , Andrew Jeffery , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-aspeed@lists.ozlabs.org, linux-kernel@vger.kernel.org, openbmc@lists.ozlabs.org Cc: Jae Hyun Yoo , Benjamin Herrenschmidt , Greg KH , Milton Miller II , Pavel Machek , Robin Murphy , Ryan Chen Subject: [PATCH linux-next v5 04/13] dt-bindings: Add a document of PECI adapter driver for ASPEED AST24xx/25xx SoCs Date: Fri, 1 Jun 2018 11:21:36 -0700 Message-Id: <20180601182136.23762-1-jae.hyun.yoo@linux.intel.com> X-Mailer: git-send-email 2.17.0 Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org This commit adds a dt-bindings document of PECI adapter driver for ASPEED AST24xx/25xx SoCs. Signed-off-by: Jae Hyun Yoo Reviewed-by: Haiyue Wang Reviewed-by: James Feist Reviewed-by: Vernon Mauery Cc: Benjamin Herrenschmidt Cc: Greg KH Cc: Jason M Biils Cc: Milton Miller II Cc: Pavel Machek Cc: Robin Murphy Cc: Ryan Chen --- .../devicetree/bindings/peci/peci-aspeed.txt | 57 +++++++++++++++++++ 1 file changed, 57 insertions(+) create mode 100644 Documentation/devicetree/bindings/peci/peci-aspeed.txt diff --git a/Documentation/devicetree/bindings/peci/peci-aspeed.txt b/Documentation/devicetree/bindings/peci/peci-aspeed.txt new file mode 100644 index 000000000000..8c35f905589d --- /dev/null +++ b/Documentation/devicetree/bindings/peci/peci-aspeed.txt @@ -0,0 +1,57 @@ +Device tree configuration for PECI buses on the AST24XX and AST25XX SoCs. + +Required properties: +- compatible : Should be "aspeed,ast2400-peci" or "aspeed,ast2500-peci" + - aspeed,ast2400-peci: ASPEED AST2400 family PECI + controller + - aspeed,ast2500-peci: ASPEED AST2500 family PECI + controller +- reg : Should contain PECI controller registers location and + length. +- #address-cells : Should be <1> required to define a client address. +- #size-cells : Should be <0> required to define a client address. +- interrupts : Should contain PECI controller interrupt. +- clocks : Should contain clock source for PECI controller. Should + reference the external oscillator clock in the second + cell. +- resets : Should contain phandle to reset controller with the reset + number in the second cell. +- clock-frequency : Should contain the operation frequency of PECI controller + in units of Hz. + 187500 ~ 24000000 + +Optional properties: +- msg-timing : Message timing negotiation period. This value will + determine the period of message timing negotiation to be + issued by PECI controller. The unit of the programmed + value is four times of PECI clock period. + 0 ~ 255 (default: 1) +- addr-timing : Address timing negotiation period. This value will + determine the period of address timing negotiation to be + issued by PECI controller. The unit of the programmed + value is four times of PECI clock period. + 0 ~ 255 (default: 1) +- rd-sampling-point : Read sampling point selection. The whole period of a bit + time will be divided into 16 time frames. This value will + determine the time frame in which the controller will + sample PECI signal for data read back. Usually in the + middle of a bit time is the best. + 0 ~ 15 (default: 8) +- cmd-timeout-ms : Command timeout in units of ms. + 1 ~ 60000 (default: 1000) + +Example: + peci0: peci-bus@0 { + compatible = "aspeed,ast2500-peci"; + reg = <0x0 0x60>; + #address-cells = <1>; + #size-cells = <0>; + interrupts = <15>; + clocks = <&syscon ASPEED_CLK_GATE_REFCLK>; + resets = <&syscon ASPEED_RESET_PECI>; + clock-frequency = <24000000>; + msg-timing = <1>; + addr-timing = <1>; + rd-sampling-point = <8>; + cmd-timeout-ms = <1000>; + };