From patchwork Mon Aug 24 08:40:08 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Martin Sperl X-Patchwork-Id: 7061791 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 1F791C05AC for ; Mon, 24 Aug 2015 08:43:13 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 367CE201F2 for ; Mon, 24 Aug 2015 08:43:12 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 5C8C8201CD for ; Mon, 24 Aug 2015 08:43:11 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZTnJv-0002Z8-Te; Mon, 24 Aug 2015 08:41:35 +0000 Received: from merlin.infradead.org ([2001:4978:20e::2]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZTnJN-0002Ew-Hi; Mon, 24 Aug 2015 08:41:01 +0000 Received: from 212-186-180-163.dynamic.surfer.at ([212.186.180.163] helo=cgate.sperl.org) by merlin.infradead.org with esmtp (Exim 4.85 #2 (Red Hat Linux)) id 1ZTnJL-000869-IU; Mon, 24 Aug 2015 08:41:00 +0000 Received: from raspb.intern.sperl.org (account martin@sperl.org [10.10.10.32] verified) by sperl.org (CommuniGate Pro SMTP 6.1.2) with ESMTPSA id 6342155; Mon, 24 Aug 2015 08:40:18 +0000 From: kernel@martin.sperl.org To: Stephen Warren , Lee Jones , Russell King , Mark Brown , Mark Rutland , devicetree@vger.kernel.org, linux-rpi-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-spi@vger.kernel.org, Ian Campbell , Rob Herring , Pawel Moll , Kumar Gala Subject: [PATCH v4 5/5] dt/bindings: bcm2835: Add binding documentation for auxiliar spi devices Date: Mon, 24 Aug 2015 08:40:08 +0000 Message-Id: <1440405608-3995-6-git-send-email-kernel@martin.sperl.org> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1440405608-3995-1-git-send-email-kernel@martin.sperl.org> References: <1440405608-3995-1-git-send-email-kernel@martin.sperl.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150824_044059_753554_2964AF1E X-CRM114-Status: GOOD ( 11.72 ) X-Spam-Score: -0.9 (/) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Martin Sperl MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-5.6 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Martin Sperl Signed-off-by: Martin Sperl --- .../bindings/spi/brcm,bcm2835-aux-spi.txt | 61 ++++++++++++++++++++ 1 file changed, 61 insertions(+) create mode 100644 Documentation/devicetree/bindings/spi/brcm,bcm2835-aux-spi.txt 1.7.10.4 diff --git a/Documentation/devicetree/bindings/spi/brcm,bcm2835-aux-spi.txt b/Documentation/devicetree/bindings/spi/brcm,bcm2835-aux-spi.txt new file mode 100644 index 0000000..2a69a3b --- /dev/null +++ b/Documentation/devicetree/bindings/spi/brcm,bcm2835-aux-spi.txt @@ -0,1 +1,61 @@ +Broadcom BCM2835 auxiliar SPI1/2 controller + +The BCM2835 contains two forms of SPI master controller, one known simply as +SPI0, and the other known as the "Universal SPI Master"; part of the +auxiliary block. This binding applies to the SPI1/2 controller. + +Required properties: +- compatible: Should be "brcm,bcm2835-aux-spi". +- reg: Should contain register location and length for the spi block + as well as for the common aux block control +- interrupts: Should contain shared interrupt of the aux block +- clocks: The clock feeding the SPI controller. +- cs-gpios: the cs-gpios (native cs is NOT supported) + see also spi-bus.txt +- bcrm,aux-enable: the bcrm,bcm2835-aux-enable config entry to handle + enabling/disabling of the spi1/spi2/uart1 HW block + second "argument" is the mask to apply to the + enable register + +Example: + +spi1@7e215080 { + compatible = "brcm,bcm2835-aux-spi"; + reg = <0x7e215080 0x40>; + interrupts = <1 29>; + clocks = <&clk_spi>; + #address-cells = <1>; + #size-cells = <0>; + cs-gpios = <&gpio 18>, <&gpio 17>, <&gpio 16>; + bcrm,aux-enable = <&aux_enable 2>; +}; + +spi2@7e2150c0 { + compatible = "brcm,bcm2835-aux-spi"; + reg = <0x7e2150c0 0x40>; + interrupts = <1 29>; + clocks = <&clk_spi>; + #address-cells = <1>; + #size-cells = <0>; + cs-gpios = <&gpio 43>, <&gpio 44>, <&gpio 45>; + bcrm,aux-enable = <&aux_enable 4>; +}; + +/* the necessary syscon config referenced above*/ +aux_enable: aux_enable@0x7e215004 { + compatible = "bcrm,bcm2835-aux"; + reg = <0x7e215004 0x04>; +}; + +Note that it also requires the GPIOs to be set up with the +correct ALT-functions. + +For spi1 the following pins need to be set as: +* ALT4: 19, 20, 21 (MISO, MOSI, SCK) + +For spi2 the following pins need to be set as: +* ALT4: 40, 41, 42 (MISO, MOSI, SCK) + +CS-GPIOS need to get set as output - typically: +* spi1: 18, 17, 16 (CS0, CS1, CS2) +* spi2: 43, 44, 45 (CS0, CS1, CS2) --