From patchwork Wed Aug 20 06:55:56 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Lothar_Wa=C3=9Fmann?= X-Patchwork-Id: 4747811 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id A0868C0338 for ; Wed, 20 Aug 2014 06:58:54 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id C421E20107 for ; Wed, 20 Aug 2014 06:58:53 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id DFDF3200CF for ; Wed, 20 Aug 2014 06:58:52 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1XJzpZ-00025t-DA; Wed, 20 Aug 2014 06:57:13 +0000 Received: from mail.karo-electronics.de ([81.173.242.67]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1XJzpL-0001yf-Ha for linux-arm-kernel@lists.infradead.org; Wed, 20 Aug 2014 06:57:00 +0000 From: =?UTF-8?q?Lothar=20Wa=C3=9Fmann?= To: Thierry Reding , linux-kernel@vger.kernel.org, linux-pwm@vger.kernel.org, =?UTF-8?q?Lothar=20Wa=C3=9Fmann?= , Shawn Guo , Sascha Hauer , Arnd Bergmann , Tony Prisk , linux-arm-kernel@lists.infradead.org Subject: [PATCHv4 4/4] pwm: imx: support output polarity inversion Date: Wed, 20 Aug 2014 08:55:56 +0200 Message-Id: <1408517756-9412-5-git-send-email-LW@KARO-electronics.de> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1408517756-9412-4-git-send-email-LW@KARO-electronics.de> References: <1408517756-9412-1-git-send-email-LW@KARO-electronics.de> <1408517756-9412-2-git-send-email-LW@KARO-electronics.de> <1408517756-9412-3-git-send-email-LW@KARO-electronics.de> <1408517756-9412-4-git-send-email-LW@KARO-electronics.de> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140819_235659_962971_CE59964E X-CRM114-Status: GOOD ( 12.69 ) X-Spam-Score: -1.4 (-) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_NONE, RP_MATCHES_RCVD, 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 The i.MX pwm unit on i.MX27 and newer SoCs provides a configurable output polarity. This patch adds support to utilize this feature where available. Signed-off-by: Lothar Waßmann Acked-by: Shawn Guo --- drivers/pwm/pwm-imx.c | 38 +++++++++++++++++++++++++++++++++++--- 1 file changed, 35 insertions(+), 3 deletions(-) diff --git a/drivers/pwm/pwm-imx.c b/drivers/pwm/pwm-imx.c index f836635..585b0a8 100644 --- a/drivers/pwm/pwm-imx.c +++ b/drivers/pwm/pwm-imx.c @@ -138,6 +138,8 @@ static int imx_pwm_config_v2(struct pwm_chip *chip, if (test_bit(PWMF_ENABLED, &pwm->flags)) cr |= MX3_PWMCR_EN; + if (pwm->polarity == PWM_POLARITY_INVERSED) + cr |= MX3_PWMCR_POUTC; writel(cr, imx->mmio_base + MX3_PWMCR); @@ -156,6 +158,11 @@ static void imx_pwm_set_enable_v2(struct pwm_chip *chip, bool enable) else val &= ~MX3_PWMCR_EN; + if (chip->pwms[0].polarity == PWM_POLARITY_INVERSED) + val |= MX3_PWMCR_POUTC; + else + val &= ~MX3_PWMCR_POUTC; + writel(val, imx->mmio_base + MX3_PWMCR); } @@ -199,27 +206,49 @@ static void imx_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) clk_disable_unprepare(imx->clk_per); } -static struct pwm_ops imx_pwm_ops = { +static int imx_pwm_set_polarity(struct pwm_chip *chip, struct pwm_device *pwm, + enum pwm_polarity polarity) +{ + struct imx_chip *imx = to_imx_chip(chip); + + dev_dbg(imx->chip.dev, "%s: polarity set to %s\n", __func__, + polarity == PWM_POLARITY_INVERSED ? "inverted" : "normal"); + + return 0; +} + +static struct pwm_ops imx_pwm_ops_v1 = { .enable = imx_pwm_enable, .disable = imx_pwm_disable, .config = imx_pwm_config, .owner = THIS_MODULE, }; +static struct pwm_ops imx_pwm_ops_v2 = { + .enable = imx_pwm_enable, + .disable = imx_pwm_disable, + .set_polarity = imx_pwm_set_polarity, + .config = imx_pwm_config, + .owner = THIS_MODULE, +}; + struct imx_pwm_data { int (*config)(struct pwm_chip *chip, struct pwm_device *pwm, int duty_ns, int period_ns); void (*set_enable)(struct pwm_chip *chip, bool enable); + struct pwm_ops *pwm_ops; }; static struct imx_pwm_data imx_pwm_data_v1 = { .config = imx_pwm_config_v1, .set_enable = imx_pwm_set_enable_v1, + .pwm_ops = &imx_pwm_ops_v1, }; static struct imx_pwm_data imx_pwm_data_v2 = { .config = imx_pwm_config_v2, .set_enable = imx_pwm_set_enable_v2, + .pwm_ops = &imx_pwm_ops_v2, }; static const struct of_device_id imx_pwm_dt_ids[] = { @@ -241,6 +270,10 @@ static int imx_pwm_probe(struct platform_device *pdev) if (!of_id) return -ENODEV; + data = of_id->data; + if (data->pwm_ops->set_polarity) + dev_dbg(&pdev->dev, "PWM supports output inversion\n"); + imx = devm_kzalloc(&pdev->dev, sizeof(*imx), GFP_KERNEL); if (imx == NULL) return -ENOMEM; @@ -259,7 +292,7 @@ static int imx_pwm_probe(struct platform_device *pdev) return PTR_ERR(imx->clk_ipg); } - imx->chip.ops = &imx_pwm_ops; + imx->chip.ops = data->pwm_ops; imx->chip.dev = &pdev->dev; imx->chip.base = -1; imx->chip.npwm = 1; @@ -270,7 +303,6 @@ static int imx_pwm_probe(struct platform_device *pdev) if (IS_ERR(imx->mmio_base)) return PTR_ERR(imx->mmio_base); - data = of_id->data; imx->config = data->config; imx->set_enable = data->set_enable;