From patchwork Sat May 7 15:21:43 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ivaylo Dimitrov X-Patchwork-Id: 9038141 Return-Path: X-Original-To: patchwork-linux-omap@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 1537ABF29F for ; Sat, 7 May 2016 15:24:18 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 2CFAF200ED for ; Sat, 7 May 2016 15:24:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 194302011D for ; Sat, 7 May 2016 15:24:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750916AbcEGPW0 (ORCPT ); Sat, 7 May 2016 11:22:26 -0400 Received: from mail-wm0-f66.google.com ([74.125.82.66]:36315 "EHLO mail-wm0-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750776AbcEGPWV (ORCPT ); Sat, 7 May 2016 11:22:21 -0400 Received: by mail-wm0-f66.google.com with SMTP id w143so13358559wmw.3; Sat, 07 May 2016 08:22:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=x7HlV8xrfO/5xFy19nEjgie2OM2YgYCKyd0og973s3M=; b=fZq0VOkMrme+Xw+rn8jD4yehNGUK9Oh9sxeLMYHBR2G6EgngX0v7cY880X1lMb/RWI w7mojzNPYiTqDmKvUHbO+30nxuzfUPRsN4mt1p4+xYVWmUO6aEKhG0WcSs9G+g4Q84OG nNrkfutXcqlSrH2Ckxq0Ca/tidszoMfKt+IhCmteoxkhwt3WVnwBlcuegevnunioGN19 nue5ooUrSJWoFCIA+K9COgmB89QlG9mewwjAQs4LW4+qAvrylFSU3vmQKAq2/r4I7czv eI1/FYiQuuNvezneJyrHztmAe92tX0tUIQoJoVPPKV6Pp/HWWoAfxXtI68wQpxZcPVHs HqIQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=x7HlV8xrfO/5xFy19nEjgie2OM2YgYCKyd0og973s3M=; b=UfMK134uFKG+Aki58JxiJk+kfBdo/1x6r2ADCzd6xo1QkBvprVHcm5EWrPDYnktf5E bPceIoROFxU8ca6epog2lD4fyVg9Mzdxq2ckADx+ZCODIzN6reSr1EAvxadi5c/lcg8X Kow8FYUoAaV+bLqiKB+sH+p6yrjgSivhlSCMAQqqtnl9rd2O/idbJAjLTct2l1lEZRSv 67xNueXlF6FeOkMiIGAg4gcJYuIRjZo6riGbplh/wvAqx0jvjVFNxUG1oO0X/m+9QBS2 ApmXfhUBD0BvCPRUbJyoW1qMS+cZK+ollYTKVZlC7OVGdCWb6cYETTy88DxpAuhY5nkH 77kw== X-Gm-Message-State: AOPr4FUV2aJrkx4s47p+phR1stgIWRV5ka293skd5pMo/ix8JWyOXjY42MIx7tP69Wf8AA== X-Received: by 10.194.51.8 with SMTP id g8mr25003183wjo.15.1462634539731; Sat, 07 May 2016 08:22:19 -0700 (PDT) Received: from localhost.localdomain ([46.249.74.23]) by smtp.gmail.com with ESMTPSA id jq1sm20737835wjc.28.2016.05.07.08.22.18 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Sat, 07 May 2016 08:22:19 -0700 (PDT) From: Ivaylo Dimitrov To: robh+dt@kernel.org, pawel.moll@arm.com, mark.rutland@arm.com, ijc+devicetree@hellion.org.uk, galak@codeaurora.org, thierry.reding@gmail.com, bcousson@baylibre.com, tony@atomide.com, linux@arm.linux.org.uk, mchehab@osg.samsung.com Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pwm@vger.kernel.org, linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org, sre@kernel.org, pali.rohar@gmail.com, Ivaylo Dimitrov Subject: [PATCH 2/7] pwm: omap-dmtimer: Allow for setting dmtimer clock source Date: Sat, 7 May 2016 18:21:43 +0300 Message-Id: <1462634508-24961-3-git-send-email-ivo.g.dimitrov.75@gmail.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1462634508-24961-1-git-send-email-ivo.g.dimitrov.75@gmail.com> References: <1462634508-24961-1-git-send-email-ivo.g.dimitrov.75@gmail.com> Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org X-Spam-Status: No, score=-8.9 required=5.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, FREEMAIL_FROM, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, T_DKIM_INVALID, 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 OMAP GP timers can have different input clocks that allow different PWM frequencies. However, there is no other way of setting the clock source but through clocks or clock-names properties of the timer itself. This limits PWM functionality to only the frequencies allowed by the particular clock source. Allowing setting the clock source by PWM rather than by timer allows different PWMs to have different ranges by not hard-wiring the clock source to the timer. Signed-off-by: Ivaylo Dimitrov Acked-by: Rob Herring --- Documentation/devicetree/bindings/pwm/pwm-omap-dmtimer.txt | 4 ++++ drivers/pwm/pwm-omap-dmtimer.c | 12 +++++++----- 2 files changed, 11 insertions(+), 5 deletions(-) diff --git a/Documentation/devicetree/bindings/pwm/pwm-omap-dmtimer.txt b/Documentation/devicetree/bindings/pwm/pwm-omap-dmtimer.txt index 5befb53..2e53324 100644 --- a/Documentation/devicetree/bindings/pwm/pwm-omap-dmtimer.txt +++ b/Documentation/devicetree/bindings/pwm/pwm-omap-dmtimer.txt @@ -9,6 +9,10 @@ Required properties: Optional properties: - ti,prescaler: Should be a value between 0 and 7, see the timers datasheet +- ti,clock-source: Set dmtimer parent clock, values between 0 and 2: + - 0x00 - high-frequency system clock (timer_sys_ck) + - 0x01 - 32-kHz always-on clock (timer_32k_ck) + - 0x02 - external clock (timer_ext_ck, OMAP2 only) Example: pwm9: dmtimer-pwm@9 { diff --git a/drivers/pwm/pwm-omap-dmtimer.c b/drivers/pwm/pwm-omap-dmtimer.c index b7e6ecb..95964c6 100644 --- a/drivers/pwm/pwm-omap-dmtimer.c +++ b/drivers/pwm/pwm-omap-dmtimer.c @@ -245,7 +245,7 @@ static int pwm_omap_dmtimer_probe(struct platform_device *pdev) struct pwm_omap_dmtimer_chip *omap; struct pwm_omap_dmtimer_pdata *pdata; pwm_omap_dmtimer *dm_timer; - u32 prescaler; + u32 v; int status; pdata = dev_get_platdata(&pdev->dev); @@ -306,10 +306,12 @@ static int pwm_omap_dmtimer_probe(struct platform_device *pdev) if (pm_runtime_active(&omap->dm_timer_pdev->dev)) omap->pdata->stop(omap->dm_timer); - /* setup dmtimer prescaler */ - if (!of_property_read_u32(pdev->dev.of_node, "ti,prescaler", - &prescaler)) - omap->pdata->set_prescaler(omap->dm_timer, prescaler); + if (!of_property_read_u32(pdev->dev.of_node, "ti,prescaler", &v)) + omap->pdata->set_prescaler(omap->dm_timer, v); + + /* setup dmtimer clock source */ + if (!of_property_read_u32(pdev->dev.of_node, "ti,clock-source", &v)) + omap->pdata->set_source(omap->dm_timer, v); omap->chip.dev = &pdev->dev; omap->chip.ops = &pwm_omap_dmtimer_ops;