From patchwork Wed Feb 13 09:26:17 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yash Shah X-Patchwork-Id: 10809437 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 0157B13B5 for ; Wed, 13 Feb 2019 09:26:43 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E22002BE79 for ; Wed, 13 Feb 2019 09:26:42 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D30CF2CA40; Wed, 13 Feb 2019 09:26:42 +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 7B66F2BE79 for ; Wed, 13 Feb 2019 09:26:42 +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:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id: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=QSk87IMjPIPRnhFiFYLphtWWAckFpDVC7AqPiPXXTFc=; b=pALjw0Tgd1RJG6cn5gw74L/pcD 9qQcxbJDXS4J3i6D5ZRdfxK3kpBJaI7BnXXaBSE5v4uLTmG9DHru6u2opYBgU2h5DrJhubZVzrDVg MLmzSZcNzPHc0Qmwzuyr+eNuSCA9rz6SWpco9Yd+tYD+WwnMDzbefZrYRGwe98GWgH7xXsfW7/aVi szxbqkSkycFdtA6sYgxifbjqWv9226FTZ+fJN4a+h3K7a0OEy1grk/gfHaVJfN1CxuN1Z4+UDLNCa x0tJSNzPf6JrzBSr2f2WyU9pyj4zmNZ/pQvQHJYdf2xrqvNBj2bmgX6dpTzWTbeKseg3FKgz+TRjU 0UflLXYQ==; 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 1gtqoS-0006V5-Vm; Wed, 13 Feb 2019 09:26:40 +0000 Received: from mail-pf1-x444.google.com ([2607:f8b0:4864:20::444]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1gtqoQ-0006U5-BC for linux-riscv@lists.infradead.org; Wed, 13 Feb 2019 09:26:39 +0000 Received: by mail-pf1-x444.google.com with SMTP id c123so895534pfb.0 for ; Wed, 13 Feb 2019 01:26:38 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sifive.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=7HfAbF1OGZMXhqcW96klsMo8xb5zJKMak24RvfCSKmU=; b=aEXA47NOOXupF/+oe1euEBQpwlZjP7ua8ri4CbaCemkHQwLOit2Qu+VS+MqTdvODUo ipAIsY0QNZAExHmVnrGE+I6nx8GDmM3y6AviKEZTUkj+VC6+Kot1AdVT1rP0y2IbsOII b4kZ0XI91gu/UWcSJbwzxgdHBy2DY7qPAAlFL5tLzp17+JWMrmKgyBtf0TTaPwx+laGf jzRj8YHSa0abX7D7HNK+O7+FSwvZNFRLGi+rDkTSkV8bAplL9+XO1daIylZEwUIaCuuL QmRUfWrmrFtIszeBgbeQ2LezVFLgN5nksSRGYwgbIvq+Y/ecAtsvXBVwVpF3TTFozuWy KZ4A== 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=7HfAbF1OGZMXhqcW96klsMo8xb5zJKMak24RvfCSKmU=; b=H+FAqEYFquGOIFp5OfjIjHeFRtHWaxlhwhlAmyARR2qvYVILi5dpPaByYnv7RFU1G2 YLYTvHD8vbeluSpc+khwqJm4GT8KbYXc0/7XiuAJ0EluDQezRHUCxw5h2cwzhhSdh/7L cRLDqnQL4gSqFSEpS9AJV3PDDCOYHxlnHyFYxIcyHQD6PWP55gKbd42TlMgKgguL2wBo eBNASUPfrdB5Hvz+Szw0bpEYvEhOAJSUP/vJFO3H+c7DOQI/7iUTDq8LqnsjDk3NR6Dq 3P9fU7UKbwZS7CK1MrHAP3KT32q+oE8S/0d/4vPREwUoNTLHH/PsK3oSqGuXA5DqpmOl me1Q== X-Gm-Message-State: AHQUAubQ1c0jjDrcEyztHepHp2Vj4HH3mMRz6410An7Bymgr7vWl+UVf aWwZHm6Dix33n1RShiQNZOOGYg== X-Google-Smtp-Source: AHgI3IYiZYTquB1nbBmJispxpSWQvSYjO4O+QY5Wv/u/E1HF1fderjX1fgboTgLoVQr27hz9l2kVRA== X-Received: by 2002:a62:c302:: with SMTP id v2mr8729772pfg.155.1550049997824; Wed, 13 Feb 2019 01:26:37 -0800 (PST) Received: from buildserver-90.open-silicon.com ([114.143.65.226]) by smtp.googlemail.com with ESMTPSA id v75sm188875pfa.164.2019.02.13.01.26.33 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 13 Feb 2019 01:26:37 -0800 (PST) From: Yash Shah To: palmer@sifive.com, linux-pwm@vger.kernel.org, linux-riscv@lists.infradead.org Subject: [PATCH v6 1/2] pwm: sifive: Add DT documentation for SiFive PWM Controller Date: Wed, 13 Feb 2019 14:56:17 +0530 Message-Id: <1550049978-20705-2-git-send-email-yash.shah@sifive.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1550049978-20705-1-git-send-email-yash.shah@sifive.com> References: <1550049978-20705-1-git-send-email-yash.shah@sifive.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190213_012638_383771_FB52CDB4 X-CRM114-Status: GOOD ( 12.22 ) X-BeenThere: linux-riscv@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@arm.com, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, robh+dt@kernel.org, sachin.ghadi@sifive.com, Yash Shah , thierry.reding@gmail.com, paul.walmsley@sifive.com MIME-Version: 1.0 Sender: "linux-riscv" Errors-To: linux-riscv-bounces+patchwork-linux-riscv=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP DT documentation for PWM controller added. Signed-off-by: Wesley W. Terpstra [Atish: Compatible string update] Signed-off-by: Atish Patra Signed-off-by: Yash Shah --- .../devicetree/bindings/pwm/pwm-sifive.txt | 30 ++++++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100644 Documentation/devicetree/bindings/pwm/pwm-sifive.txt diff --git a/Documentation/devicetree/bindings/pwm/pwm-sifive.txt b/Documentation/devicetree/bindings/pwm/pwm-sifive.txt new file mode 100644 index 0000000..3b9c64c --- /dev/null +++ b/Documentation/devicetree/bindings/pwm/pwm-sifive.txt @@ -0,0 +1,30 @@ +SiFive PWM controller + +Unlike most other PWM controllers, the SiFive PWM controller currently only +supports one period for all channels in the PWM. All PWMs need to run at +the same period. The period also has significant restrictions on the values +it can achieve, which the driver rounds to the nearest achievable period. +PWM RTL that corresponds to the IP block version numbers can be found +here: + +https://github.com/sifive/sifive-blocks/tree/master/src/main/scala/devices/pwm + +Required properties: +- compatible: Should be "sifive,$socname-pwm" and "sifive,pwmX". + Please refer to sifive-blocks-ip-versioning.txt for details. +- reg: physical base address and length of the controller's registers +- clocks: Should contain a clock identifier for the PWM's parent clock. +- #pwm-cells: Should be 3. See pwm.txt in this directory + for a description of the cell format. +- interrupts: one interrupt per PWM channel + +Examples: + +pwm: pwm@10020000 { + compatible = "sifive,fu540-c000-pwm", "sifive,pwm0"; + reg = <0x0 0x10020000 0x0 0x1000>; + clocks = <&tlclk>; + interrupt-parent = <&plic>; + interrupts = <42 43 44 45>; + #pwm-cells = <3>; +};