From patchwork Wed Apr 24 07:43:44 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lubomir Rintel X-Patchwork-Id: 10914265 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 D6BC21708 for ; Wed, 24 Apr 2019 07:44:25 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CAA282887D for ; Wed, 24 Apr 2019 07:44:25 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id BE74C288AD; Wed, 24 Apr 2019 07:44:25 +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=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable 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 308242887D for ; Wed, 24 Apr 2019 07:44:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726880AbfDXHoX (ORCPT ); Wed, 24 Apr 2019 03:44:23 -0400 Received: from shell.v3.sk ([90.176.6.54]:39479 "EHLO shell.v3.sk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726964AbfDXHoX (ORCPT ); Wed, 24 Apr 2019 03:44:23 -0400 Received: from localhost (localhost [127.0.0.1]) by zimbra.v3.sk (Postfix) with ESMTP id 9F8F0102E46; Wed, 24 Apr 2019 09:44:18 +0200 (CEST) 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 FZ4kxy9KHctZ; Wed, 24 Apr 2019 09:44:05 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by zimbra.v3.sk (Postfix) with ESMTP id 54380102E65; Wed, 24 Apr 2019 09:44:04 +0200 (CEST) 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 rgEQJHJgFIni; Wed, 24 Apr 2019 09:44:00 +0200 (CEST) Received: from belphegor.brq.redhat.com (nat-pool-brq-t.redhat.com [213.175.37.10]) by zimbra.v3.sk (Postfix) with ESMTPSA id 81EF8102D53; Wed, 24 Apr 2019 09:43:59 +0200 (CEST) From: Lubomir Rintel To: Andy Shevchenko , Darren Hart Cc: Rob Herring , Russell King , Mark Rutland , platform-driver-x86@vger.kernel.org, linux-pm@vger.kernel.org, Sebastian Reichel , Lubomir Rintel , Pavel Machek , Rob Herring Subject: [PATCH v6 01/10] dt-bindings: olpc,xo1.75-ec: Add OLPC XO-1.75 EC bindings Date: Wed, 24 Apr 2019 09:43:44 +0200 Message-Id: <20190424074353.458446-2-lkundrak@v3.sk> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190424074353.458446-1-lkundrak@v3.sk> References: <20190424074353.458446-1-lkundrak@v3.sk> MIME-Version: 1.0 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.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 Reviewed-by: Rob Herring --- Changes since v5: - Added Rob Herring's Reviewed-by tag 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>; + }; + };