From patchwork Sun Nov 24 17:29:05 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?b?Q2zDqW1lbnQgUMOpcm9u?= X-Patchwork-Id: 1199979 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-pwm-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b="UqEa69xK"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 47Lccg4gV8z9sPW for ; Mon, 25 Nov 2019 04:30:11 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726952AbfKXRaH (ORCPT ); Sun, 24 Nov 2019 12:30:07 -0500 Received: from mail-wm1-f65.google.com ([209.85.128.65]:35922 "EHLO mail-wm1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726931AbfKXRaH (ORCPT ); Sun, 24 Nov 2019 12:30:07 -0500 Received: by mail-wm1-f65.google.com with SMTP id n188so11186978wme.1; Sun, 24 Nov 2019 09:30:05 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=Sr+7BNL0b4tCp1MqDsXudPxzWoZbpaPXSrRxNlurcYk=; b=UqEa69xKeg3cqB4VbMFljhQGtuxAd10jRTcPE0LGk4j/hSErxDTUllZ/GrJa/FbIXG ZVT2g7Iv0pXgaqBE3UOEnoydCDGbMzmteXCcELyEpn+smCmGGRiT2J8/oW/+cacN7VnC zTzpErhnp/KBF7MCToR0Zdrk0C1rAOdg9fACXZEh9BFypwjVuXFPEKW/N0ZHME5X4l7n eX4kXDzdAA6JeSzhLoWOm3XEEazDC6+/lbCzA1bVcUUYvZ7tGQQ5OdD8lk56bsETe6eY YMm00Y9+IuadMtL4FawcIBSBWvHNbHtqgVoCsurLldWkwT4PL6f6QZyOJXhJXcOg/z7d HXuA== 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:mime-version:content-transfer-encoding; bh=Sr+7BNL0b4tCp1MqDsXudPxzWoZbpaPXSrRxNlurcYk=; b=U3098q1qXq86hNd4vkWfPAFZzacCWXmjajs1Q0gROmA9XYf67XiXmJbQicC9LhpRfu 1bC3ls1z3cEj+KsegRdlTzZ349aUY/nnuW61PzKrN4xWY3XEkIZO1MmJC42FGKU5BDEL qEWFeG8Ek6Rhx1DXftix+Ku3V2VYZAn0jIAYVJpc3nbpQ7SLhkz6jjttzk1i+qddA2Go dOmH7H7cE5A1BoloTxFaLKfKNpc1jv3SroMA/50Ed7br8Ozod8NOCUKvCcUQHWh+EOvi YF3FtNryUR8ZnlHxzCXXBChRGrUzb5xHeYYeCHDG+qMjKU1y6rIhcGVEr6qIwdmrxkxQ bNQw== X-Gm-Message-State: APjAAAVYXgnfdci/GY5iQ69p0r7CGKpskpOsjCA0DpTaM8cjAtvySGeD 2kHAhYo/KlEN7V5r1KwDZUs= X-Google-Smtp-Source: APXvYqwb7kqkYB4bJbTmfa2R2ggNhznLIfWi1+2SWPBX/8mre7n4Sp7dEOjIC8bHGA4RcFkWR4cteA== X-Received: by 2002:a7b:c416:: with SMTP id k22mr7117238wmi.10.1574616605112; Sun, 24 Nov 2019 09:30:05 -0800 (PST) Received: from localhost.localdomain ([2a01:e0a:1f1:d0f0::4e2b:d7ca]) by smtp.gmail.com with ESMTPSA id n13sm5537275wmi.25.2019.11.24.09.30.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 24 Nov 2019 09:30:04 -0800 (PST) From: =?utf-8?b?Q2zDqW1lbnQgUMOpcm9u?= To: Thierry Reding , =?utf-8?q?Uwe_Kleine-K?= =?utf-8?b?w7ZuaWc=?= , Maxime Ripard , Chen-Yu Tsai , Philipp Zabel Cc: linux-pwm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-sunxi@googlegroups.com, Jernej Skrabec , =?utf-8?b?Q2zDqW1lbnQgUMOpcm9u?= Subject: [PATCH v9 3/6] pwm: sun4i: Add an optional probe for bus clock Date: Sun, 24 Nov 2019 18:29:05 +0100 Message-Id: <20191124172908.10804-4-peron.clem@gmail.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191124172908.10804-1-peron.clem@gmail.com> References: <20191124172908.10804-1-peron.clem@gmail.com> MIME-Version: 1.0 Sender: linux-pwm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pwm@vger.kernel.org From: Jernej Skrabec H6 PWM core needs bus clock to be enabled in order to work. Add an optional probe for it. Signed-off-by: Jernej Skrabec Signed-off-by: Clément Péron Reviewed-by: Uwe Kleine-König --- drivers/pwm/pwm-sun4i.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/drivers/pwm/pwm-sun4i.c b/drivers/pwm/pwm-sun4i.c index 80026167044b..a6727dd89e28 100644 --- a/drivers/pwm/pwm-sun4i.c +++ b/drivers/pwm/pwm-sun4i.c @@ -78,6 +78,7 @@ struct sun4i_pwm_data { struct sun4i_pwm_chip { struct pwm_chip chip; + struct clk *bus_clk; struct clk *clk; struct reset_control *rst; void __iomem *base; @@ -391,6 +392,14 @@ static int sun4i_pwm_probe(struct platform_device *pdev) } } + pwm->bus_clk = devm_clk_get_optional(&pdev->dev, "bus"); + if (IS_ERR(pwm->bus_clk)) { + if (PTR_ERR(pwm->rst) != -EPROBE_DEFER) + dev_err(&pdev->dev, "get bus clock failed %pe\n", + pwm->bus_clk); + return PTR_ERR(pwm->bus_clk); + } + pwm->rst = devm_reset_control_get_optional_shared(&pdev->dev, NULL); if (IS_ERR(pwm->rst)) { if (PTR_ERR(pwm->rst) != -EPROBE_DEFER) @@ -407,6 +416,17 @@ static int sun4i_pwm_probe(struct platform_device *pdev) return ret; } + /* + * We're keeping the bus clock on for the sake of simplicity. + * Actually it only needs to be on for hardware register accesses. + */ + ret = clk_prepare_enable(pwm->bus_clk); + if (ret) { + dev_err(&pdev->dev, "cannot prepare and enable bus_clk %pe\n", + ERR_PTR(ret)); + goto err_bus; + } + pwm->chip.dev = &pdev->dev; pwm->chip.ops = &sun4i_pwm_ops; pwm->chip.base = -1; @@ -427,6 +447,8 @@ static int sun4i_pwm_probe(struct platform_device *pdev) return 0; err_pwm_add: + clk_disable_unprepare(pwm->bus_clk); +err_bus: reset_control_assert(pwm->rst); return ret; @@ -441,6 +463,7 @@ static int sun4i_pwm_remove(struct platform_device *pdev) if (ret) return ret; + clk_disable_unprepare(pwm->bus_clk); reset_control_assert(pwm->rst); return 0;