From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.9 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 54448C4321A for ; Tue, 11 Jun 2019 05:45:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 27C2E2086D for ; Tue, 11 Jun 2019 05:45:29 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=sifive.com header.i=@sifive.com header.b="g69hp4Wt" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2403776AbfFKFpT (ORCPT ); Tue, 11 Jun 2019 01:45:19 -0400 Received: from mail-pf1-f194.google.com ([209.85.210.194]:37659 "EHLO mail-pf1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2391271AbfFKFpT (ORCPT ); Tue, 11 Jun 2019 01:45:19 -0400 Received: by mail-pf1-f194.google.com with SMTP id 19so5845535pfa.4 for ; Mon, 10 Jun 2019 22:45:18 -0700 (PDT) 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=+NvS/bA472zdii99ejJQCZ5ekFJyNtU3GhsdHX2kjcM=; b=g69hp4WtKBXVs/W2OQRi6i7+BJJ9NA/B3UZrmnFwSIpxPOXdV+4SehL9/1NeJUiApl JaaOQQjCNWD+PpFRhB34XF2kPoPa/mF17bH1OZPaeGDkY+hiEQwG3OuNoQSiCxpuEl07 pB1/dW+l1cwlC2FlB2aQL/4O6Rt2oM7V+42rmb54lxlzfZSAOPc6PyE+snhm1uXqfpTc 11kMCPgQ2Ile4qANa1CjSNT6I68030nkwfkIdQ1+z26YVvJsmOO5Y/T5TUZFKBrC8TH7 yATQ6MwMJ9dESxrqa9Z1tGRmeBL8dzJnlv9k1F6bPGxrhP8n5PVjUKMa0DAdkpsPhaEV 32hw== 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=+NvS/bA472zdii99ejJQCZ5ekFJyNtU3GhsdHX2kjcM=; b=GjFhMce2EZiAA2WfZvxMHn2VvSMPSV+iN30N9LeuhaRMFdSz3CZNyN9NhQqv3dUzcR owDEmWwsp71whwSw+5qaMXpQh2DLhS1L1ytHnuUjCwEQxVxHwZdnFjNHHO2oqLSuzOCr QRG7MnBgmCcb7ABanoxapZu6EZNCdjtNB/912FRMLZv08N6YWRkMYmr9OuKSAfVUckQH tPwsFqqx16JneaxGSxPeeIO5bb4bT/3JwisIahQI2u0DZGf/OeL0MkM/h68bu/NG/jTO KRenQiVEx1URsiu4XV7RcHDC7s169thnDr3fXVyQ+8WorFw5NRKbYq9s24pc3iC8ogKd FhDw== X-Gm-Message-State: APjAAAWXDLzeyLUr7KFJad1QyHs5GAKxKiXjBFsn+mykhsauetwdU4eF 1KvVMGPuODMk0PQvqVj6926Z9w== X-Google-Smtp-Source: APXvYqy7aPHGjbrwSUE5dKDEjSmoZTsNPoob8c9BNG2BjQeSH6XN6wjbcyQNmng43AiT09d172xG7A== X-Received: by 2002:a63:f957:: with SMTP id q23mr19080988pgk.326.1560231918364; Mon, 10 Jun 2019 22:45:18 -0700 (PDT) Received: from buildserver-90.open-silicon.com ([114.143.65.226]) by smtp.googlemail.com with ESMTPSA id d35sm11609228pgm.31.2019.06.10.22.45.14 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 10 Jun 2019 22:45:17 -0700 (PDT) From: Yash Shah To: thierry.reding@gmail.com, linux-pwm@vger.kernel.org, devicetree@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, u.kleine-koenig@pengutronix.de Cc: robh+dt@kernel.org, mark.rutland@arm.com, palmer@sifive.com, paul.walmsley@sifive.com, aou@eecs.berkeley.edu, sachin.ghadi@sifive.com, Yash Shah Subject: [PATCH v13 1/2] pwm: sifive: Add DT documentation for SiFive PWM Controller Date: Tue, 11 Jun 2019 11:14:43 +0530 Message-Id: <1560231884-15694-2-git-send-email-yash.shah@sifive.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1560231884-15694-1-git-send-email-yash.shah@sifive.com> References: <1560231884-15694-1-git-send-email-yash.shah@sifive.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 Reviewed-by: Rob Herring --- .../devicetree/bindings/pwm/pwm-sifive.txt | 33 ++++++++++++++++++++++ 1 file changed, 33 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..36447e3 --- /dev/null +++ b/Documentation/devicetree/bindings/pwm/pwm-sifive.txt @@ -0,0 +1,33 @@ +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,-pwm" and "sifive,pwm". + Supported compatible strings are: "sifive,fu540-c000-pwm" for the SiFive + PWM v0 as integrated onto the SiFive FU540 chip, and "sifive,pwm0" for the + SiFive PWM v0 IP block with no chip integration tweaks. + 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>; +}; -- 1.9.1