From patchwork Thu Jan 10 17:58:36 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lubomir Rintel X-Patchwork-Id: 10756517 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D51E61399 for ; Thu, 10 Jan 2019 17:59:31 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C586A29B1A for ; Thu, 10 Jan 2019 17:59:31 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B89E129B6C; Thu, 10 Jan 2019 17:59:31 +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=-5.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 5C44629B1A for ; Thu, 10 Jan 2019 17:59:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=qlw+80rBigqVJfRBYezjwsSm9Of7dH49pA3A8tosjK4=; b=gUJhVNuJNglKUK nKKpcgnSTCGJ8vpvHFAMcVwxj22XAJ3w566Kaagzte+9AxHfMOnav0PsaiqowRgz12l8ejqXDoiUN 4MgI5mx+Z5SEcwDU5YZFYz0GV1qMC0FYFqnELYoO4b7SDmleZMsMDn06k4/2eRTrZnYTUGhLDcA4o pfinvQl3m4jFv7hxWDH95yRO7S2/yPcEC/gefQZcRHKu7P5ANFaC4aNxq2YKhUQyt1jMJphsAjCKz b0fmry4EIcZg+9kPBZG/LTI+EZxgpGH+K8mDt/GolLzqEXQyJ8QtHBJcYUkcLDSoiWsuQEbrimiNd a/mGik44mBdPXmtluKyw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1ghec3-00017i-3x; Thu, 10 Jan 2019 17:59:27 +0000 Received: from shell.v3.sk ([90.176.6.54]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1ghebk-0000rh-Rs for linux-arm-kernel@lists.infradead.org; Thu, 10 Jan 2019 17:59:10 +0000 Received: from localhost (localhost [127.0.0.1]) by zimbra.v3.sk (Postfix) with ESMTP id E1D241002F7; Thu, 10 Jan 2019 18:59:04 +0100 (CET) Received: from shell.v3.sk ([127.0.0.1]) by localhost (zimbra.v3.sk [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id PzyG_0JlMs-I; Thu, 10 Jan 2019 18:58:56 +0100 (CET) Received: from localhost (localhost [127.0.0.1]) by zimbra.v3.sk (Postfix) with ESMTP id 3FF2E1002FB; Thu, 10 Jan 2019 18:58:55 +0100 (CET) X-Virus-Scanned: amavisd-new at zimbra.v3.sk Received: from shell.v3.sk ([127.0.0.1]) by localhost (zimbra.v3.sk [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id MA-jPCPI_amu; Thu, 10 Jan 2019 18:58:53 +0100 (CET) Received: from belphegor.brq.redhat.com (nat-pool-brq-t.redhat.com [213.175.37.10]) by zimbra.v3.sk (Postfix) with ESMTPSA id 2E5921002F1; Thu, 10 Jan 2019 18:58:53 +0100 (CET) From: Lubomir Rintel To: Andy Shevchenko , Darren Hart Subject: [PATCH v5 01/10] dt-bindings: olpc, xo1.75-ec: Add OLPC XO-1.75 EC bindings Date: Thu, 10 Jan 2019 18:58:36 +0100 Message-Id: <20190110175845.1203986-2-lkundrak@v3.sk> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190110175845.1203986-1-lkundrak@v3.sk> References: <20190110175845.1203986-1-lkundrak@v3.sk> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190110_095909_058097_37F372A4 X-CRM114-Status: UNSURE ( 9.98 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , devicetree@vger.kernel.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, Russell King , platform-driver-x86@vger.kernel.org, Lubomir Rintel , Rob Herring , Pavel Machek , linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP The OLPC XO-1.75 Embedded Controller is a SPI master that uses extra signals for handshaking. It needs to know when is the slave (Linux) side's TX FIFO ready for transfer (the ready-gpio signal on the SPI controller node) and when does it wish to respond with a command (the cmd-gpio property). Signed-off-by: Lubomir Rintel Acked-by: Pavel Machek --- Changes since v1: - s/cmd-gpio/cmd-gpios/ - s/ready-gpio/ready-gpios/ in the documentation paragraph - Remove status = "okay" from the example .../bindings/misc/olpc,xo1.75-ec.txt | 23 +++++++++++++++++++ 1 file changed, 23 insertions(+) create mode 100644 Documentation/devicetree/bindings/misc/olpc,xo1.75-ec.txt diff --git a/Documentation/devicetree/bindings/misc/olpc,xo1.75-ec.txt b/Documentation/devicetree/bindings/misc/olpc,xo1.75-ec.txt new file mode 100644 index 000000000000..8c4d649cdd8f --- /dev/null +++ b/Documentation/devicetree/bindings/misc/olpc,xo1.75-ec.txt @@ -0,0 +1,23 @@ +OLPC XO-1.75 Embedded Controller + +Required properties: +- compatible: Should be "olpc,xo1.75-ec". +- cmd-gpios: gpio specifier of the CMD pin + +The embedded controller requires the SPI controller driver to signal readiness +to receive a transfer (that is, when TX FIFO contains the response data) by +strobing the ACK pin with the ready signal. See the "ready-gpios" property of the +SSP binding as documented in: +. + +Example: + &ssp3 { + spi-slave; + ready-gpios = <&gpio 125 GPIO_ACTIVE_HIGH>; + + slave { + compatible = "olpc,xo1.75-ec"; + spi-cpha; + cmd-gpios = <&gpio 155 GPIO_ACTIVE_HIGH>; + }; + };