From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964816AbbENOwX (ORCPT ); Thu, 14 May 2015 10:52:23 -0400 Received: from mailgw01.mediatek.com ([210.61.82.183]:37888 "EHLO mailgw01.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S933110AbbENOwU (ORCPT ); Thu, 14 May 2015 10:52:20 -0400 X-Listener-Flag: 11101 Message-ID: <1431615123.15140.36.camel@mtksdaap41> Subject: Re: [PATCH 2/2] pwm: add Mediatek display PWM driver support From: YH Huang To: Sascha Hauer CC: Matthias Brugger , Mark Rutland , Thierry Reding , "Rob Herring" , Pawel Moll , , , , , , , "Sascha Hauer" , Date: Thu, 14 May 2015 22:52:03 +0800 In-Reply-To: <20150512130005.GS6325@pengutronix.de> References: <1431336382-13167-1-git-send-email-yh.huang@mediatek.com> <1431336382-13167-3-git-send-email-yh.huang@mediatek.com> <20150512130005.GS6325@pengutronix.de> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.2.3-0ubuntu6 Content-Transfer-Encoding: 7bit MIME-Version: 1.0 X-MTK: N Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 2015-05-12 at 15:00 +0200, Sascha Hauer wrote: > On Mon, May 11, 2015 at 05:26:22PM +0800, YH Huang wrote: > > + > > +static int mtk_disp_pwm_probe(struct platform_device *pdev) > > +{ > > + struct mtk_disp_pwm_chip *pwm; > > The struct mtk_disp_pwm_chip * is named 'mpc' in the other functions. > For consistency reasons you should do that here aswell. > I miss it! Maybe 'mdpc' is a better name for mtk_disp_pwm_chip. > > + struct resource *r; > > + int ret; > > + > > + pwm = devm_kzalloc(&pdev->dev, sizeof(*pwm), GFP_KERNEL); > > + if (!pwm) > > + return -ENOMEM; > > + > > + pwm->dev = &pdev->dev; > > + > > + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); > > + pwm->mmio_base = devm_ioremap_resource(&pdev->dev, r); > > + if (IS_ERR(pwm->mmio_base)) > > + return PTR_ERR(pwm->mmio_base); > > + > > + pwm->clk_main = devm_clk_get(&pdev->dev, "main"); > > + if (IS_ERR(pwm->clk_main)) > > + return PTR_ERR(pwm->clk_main); > > + pwm->clk_mm = devm_clk_get(&pdev->dev, "mm"); > > + if (IS_ERR(pwm->clk_mm)) > > + return PTR_ERR(pwm->clk_mm); > > + > > + ret = clk_prepare_enable(pwm->clk_main); > > + if (ret < 0) > > + return ret; > > + ret = clk_prepare_enable(pwm->clk_mm); > > + if (ret < 0) { > > + clk_disable_unprepare(pwm->clk_main); > > + return ret; > > + } > > + > > + platform_set_drvdata(pdev, pwm); > > + > > + pwm->chip.dev = &pdev->dev; > > + pwm->chip.ops = &mtk_disp_pwm_ops; > > + pwm->chip.base = -1; > > + pwm->chip.npwm = NUM_PWM; > > + > > + ret = pwmchip_add(&pwm->chip); > > + if (ret < 0) { > > + dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret); > > + return ret; > > This error path leaves the clocks enabled. > I forgot this one. I will fix it. > > + } > > + > > + return 0; > > +} > > + > > +static int mtk_disp_pwm_remove(struct platform_device *pdev) > > +{ > > + struct mtk_disp_pwm_chip *pc = platform_get_drvdata(pdev); > > + > > + if (WARN_ON(!pc)) > > + return -ENODEV; > > + > > + clk_disable_unprepare(pc->clk_main); > > + clk_disable_unprepare(pc->clk_mm); > > + > > + return pwmchip_remove(&pc->chip); > > You should first remove the pwmchip and disable the clocks afterwards. > Also note that this function can fail. > OK. > Sascha > Thank for your suggestion. Regards, YH Huang From mboxrd@z Thu Jan 1 00:00:00 1970 From: YH Huang Subject: Re: [PATCH 2/2] pwm: add Mediatek display PWM driver support Date: Thu, 14 May 2015 22:52:03 +0800 Message-ID: <1431615123.15140.36.camel@mtksdaap41> References: <1431336382-13167-1-git-send-email-yh.huang@mediatek.com> <1431336382-13167-3-git-send-email-yh.huang@mediatek.com> <20150512130005.GS6325@pengutronix.de> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20150512130005.GS6325@pengutronix.de> Sender: linux-pwm-owner@vger.kernel.org To: Sascha Hauer Cc: Matthias Brugger , Mark Rutland , Thierry Reding , Rob Herring , Pawel Moll , linux-pwm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, srv_heupstream@mediatek.com, linux-mediatek@lists.infradead.org, Sascha Hauer , yh.huang@mediatek.com List-Id: devicetree@vger.kernel.org On Tue, 2015-05-12 at 15:00 +0200, Sascha Hauer wrote: > On Mon, May 11, 2015 at 05:26:22PM +0800, YH Huang wrote: > > + > > +static int mtk_disp_pwm_probe(struct platform_device *pdev) > > +{ > > + struct mtk_disp_pwm_chip *pwm; > > The struct mtk_disp_pwm_chip * is named 'mpc' in the other functions. > For consistency reasons you should do that here aswell. > I miss it! Maybe 'mdpc' is a better name for mtk_disp_pwm_chip. > > + struct resource *r; > > + int ret; > > + > > + pwm = devm_kzalloc(&pdev->dev, sizeof(*pwm), GFP_KERNEL); > > + if (!pwm) > > + return -ENOMEM; > > + > > + pwm->dev = &pdev->dev; > > + > > + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); > > + pwm->mmio_base = devm_ioremap_resource(&pdev->dev, r); > > + if (IS_ERR(pwm->mmio_base)) > > + return PTR_ERR(pwm->mmio_base); > > + > > + pwm->clk_main = devm_clk_get(&pdev->dev, "main"); > > + if (IS_ERR(pwm->clk_main)) > > + return PTR_ERR(pwm->clk_main); > > + pwm->clk_mm = devm_clk_get(&pdev->dev, "mm"); > > + if (IS_ERR(pwm->clk_mm)) > > + return PTR_ERR(pwm->clk_mm); > > + > > + ret = clk_prepare_enable(pwm->clk_main); > > + if (ret < 0) > > + return ret; > > + ret = clk_prepare_enable(pwm->clk_mm); > > + if (ret < 0) { > > + clk_disable_unprepare(pwm->clk_main); > > + return ret; > > + } > > + > > + platform_set_drvdata(pdev, pwm); > > + > > + pwm->chip.dev = &pdev->dev; > > + pwm->chip.ops = &mtk_disp_pwm_ops; > > + pwm->chip.base = -1; > > + pwm->chip.npwm = NUM_PWM; > > + > > + ret = pwmchip_add(&pwm->chip); > > + if (ret < 0) { > > + dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret); > > + return ret; > > This error path leaves the clocks enabled. > I forgot this one. I will fix it. > > + } > > + > > + return 0; > > +} > > + > > +static int mtk_disp_pwm_remove(struct platform_device *pdev) > > +{ > > + struct mtk_disp_pwm_chip *pc = platform_get_drvdata(pdev); > > + > > + if (WARN_ON(!pc)) > > + return -ENODEV; > > + > > + clk_disable_unprepare(pc->clk_main); > > + clk_disable_unprepare(pc->clk_mm); > > + > > + return pwmchip_remove(&pc->chip); > > You should first remove the pwmchip and disable the clocks afterwards. > Also note that this function can fail. > OK. > Sascha > Thank for your suggestion. Regards, YH Huang From mboxrd@z Thu Jan 1 00:00:00 1970 From: yh.huang@mediatek.com (YH Huang) Date: Thu, 14 May 2015 22:52:03 +0800 Subject: [PATCH 2/2] pwm: add Mediatek display PWM driver support In-Reply-To: <20150512130005.GS6325@pengutronix.de> References: <1431336382-13167-1-git-send-email-yh.huang@mediatek.com> <1431336382-13167-3-git-send-email-yh.huang@mediatek.com> <20150512130005.GS6325@pengutronix.de> Message-ID: <1431615123.15140.36.camel@mtksdaap41> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Tue, 2015-05-12 at 15:00 +0200, Sascha Hauer wrote: > On Mon, May 11, 2015 at 05:26:22PM +0800, YH Huang wrote: > > + > > +static int mtk_disp_pwm_probe(struct platform_device *pdev) > > +{ > > + struct mtk_disp_pwm_chip *pwm; > > The struct mtk_disp_pwm_chip * is named 'mpc' in the other functions. > For consistency reasons you should do that here aswell. > I miss it! Maybe 'mdpc' is a better name for mtk_disp_pwm_chip. > > + struct resource *r; > > + int ret; > > + > > + pwm = devm_kzalloc(&pdev->dev, sizeof(*pwm), GFP_KERNEL); > > + if (!pwm) > > + return -ENOMEM; > > + > > + pwm->dev = &pdev->dev; > > + > > + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); > > + pwm->mmio_base = devm_ioremap_resource(&pdev->dev, r); > > + if (IS_ERR(pwm->mmio_base)) > > + return PTR_ERR(pwm->mmio_base); > > + > > + pwm->clk_main = devm_clk_get(&pdev->dev, "main"); > > + if (IS_ERR(pwm->clk_main)) > > + return PTR_ERR(pwm->clk_main); > > + pwm->clk_mm = devm_clk_get(&pdev->dev, "mm"); > > + if (IS_ERR(pwm->clk_mm)) > > + return PTR_ERR(pwm->clk_mm); > > + > > + ret = clk_prepare_enable(pwm->clk_main); > > + if (ret < 0) > > + return ret; > > + ret = clk_prepare_enable(pwm->clk_mm); > > + if (ret < 0) { > > + clk_disable_unprepare(pwm->clk_main); > > + return ret; > > + } > > + > > + platform_set_drvdata(pdev, pwm); > > + > > + pwm->chip.dev = &pdev->dev; > > + pwm->chip.ops = &mtk_disp_pwm_ops; > > + pwm->chip.base = -1; > > + pwm->chip.npwm = NUM_PWM; > > + > > + ret = pwmchip_add(&pwm->chip); > > + if (ret < 0) { > > + dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret); > > + return ret; > > This error path leaves the clocks enabled. > I forgot this one. I will fix it. > > + } > > + > > + return 0; > > +} > > + > > +static int mtk_disp_pwm_remove(struct platform_device *pdev) > > +{ > > + struct mtk_disp_pwm_chip *pc = platform_get_drvdata(pdev); > > + > > + if (WARN_ON(!pc)) > > + return -ENODEV; > > + > > + clk_disable_unprepare(pc->clk_main); > > + clk_disable_unprepare(pc->clk_mm); > > + > > + return pwmchip_remove(&pc->chip); > > You should first remove the pwmchip and disable the clocks afterwards. > Also note that this function can fail. > OK. > Sascha > Thank for your suggestion. Regards, YH Huang