From patchwork Wed Mar 30 20:03:47 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Boris BREZILLON X-Patchwork-Id: 8704861 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 [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 26F04C0553 for ; Wed, 30 Mar 2016 20:26:05 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 595D120361 for ; Wed, 30 Mar 2016 20:26:04 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 81559201EF for ; Wed, 30 Mar 2016 20:26:03 +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 1alMfM-0000tI-Gx; Wed, 30 Mar 2016 20:24:36 +0000 Received: from down.free-electrons.com ([37.187.137.238] helo=mail.free-electrons.com) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1alMN5-00062s-Qb; Wed, 30 Mar 2016 20:05:48 +0000 Received: by mail.free-electrons.com (Postfix, from userid 110) id C8D0E1856; Wed, 30 Mar 2016 22:05:24 +0200 (CEST) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from localhost.localdomain (LFbn-1-2159-240.w90-76.abo.wanadoo.fr [90.76.216.240]) by mail.free-electrons.com (Postfix) with ESMTPSA id D1F301816; Wed, 30 Mar 2016 22:04:58 +0200 (CEST) From: Boris Brezillon To: Thierry Reding , linux-pwm@vger.kernel.org Subject: [PATCH v5 24/46] pwm: sti: add support for initial state retrieval Date: Wed, 30 Mar 2016 22:03:47 +0200 Message-Id: <1459368249-13241-25-git-send-email-boris.brezillon@free-electrons.com> X-Mailer: git-send-email 2.5.0 In-Reply-To: <1459368249-13241-1-git-send-email-boris.brezillon@free-electrons.com> References: <1459368249-13241-1-git-send-email-boris.brezillon@free-electrons.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160330_130544_430821_3DE312A9 X-CRM114-Status: GOOD ( 13.68 ) X-Spam-Score: -2.9 (--) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Milo Kim , Kamil Debski , Heiko Stuebner , linux-doc@vger.kernel.org, David Airlie , Mike Turquette , linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-sunxi@googlegroups.com, Alexandre Belloni , Daniel Vetter , Lee Jones , linux-clk@vger.kernel.org, linux-leds@vger.kernel.org, Boris Brezillon , Krzysztof Kozlowski , linux-samsung-soc@vger.kernel.org, Alexander Shiyan , Jonathan Corbet , Robert Jarzmik , lm-sensors@lm-sensors.org, linux-rockchip@lists.infradead.org, Chen-Yu Tsai , Tomi Valkeinen , linux-input@vger.kernel.org, Jean-Christophe Plagniol-Villard , intel-gfx@lists.freedesktop.org, Guenter Roeck , Jean Delvare , Joachim Eastwood , Bryan Wu , Jani Nikula , Mark Brown , Jacek Anaszewski , linux-arm-kernel@lists.infradead.org, Thomas Petazzoni , Ryan Mallon , Jingoo Han , Dmitry Torokhov , Stephen Boyd , Liam Girdwood , Hartley Sweeten , Richard Purdie , Kukjin Kim , Daniel Vetter , Maxime Ripard MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Implement ->get_state() to provide support for initial state retrieval. Signed-off-by: Boris Brezillon --- drivers/pwm/pwm-sti.c | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) diff --git a/drivers/pwm/pwm-sti.c b/drivers/pwm/pwm-sti.c index 92abbd5..0fbca94 100644 --- a/drivers/pwm/pwm-sti.c +++ b/drivers/pwm/pwm-sti.c @@ -238,6 +238,46 @@ static void sti_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) mutex_unlock(&pc->sti_pwm_lock); } +static void sti_pwm_get_state(struct pwm_chip *chip, + struct pwm_device *pwm, + struct pwm_state *pstate) +{ + struct sti_pwm_chip *pc = to_sti_pwmchip(chip); + unsigned int regval, prescaler; + u64 timens; + int ret; + + /* The clock has to be enabled to access PWM registers */ + ret = clk_enable(pc->clk); + if (ret) { + dev_err(chip->dev, "Failed to enable PWM clk"); + return; + } + + regmap_field_read(pc->prescale_high, ®val); + prescaler = regval << 4; + regmap_field_read(pc->prescale_low, ®val); + prescaler |= regval; + + timens = (u64)(prescaler + 1) * NSEC_PER_SEC * + (pc->cdata->max_pwm_cnt + 1); + do_div(timens, pc->clk_rate); + + pstate->period = timens; + + regmap_read(pc->regmap, STI_DS_REG(pwm->hwpwm), ®val); + timens = (u64)(regval + 1) * pstate->period; + do_div(timens, pc->cdata->max_pwm_cnt + 1); + pstate->duty_cycle = timens; + + regmap_field_read(pc->pwm_en, ®val); + pstate->enabled = regval; + + pstate->polarity = PWM_POLARITY_NORMAL; + + clk_disable(pc->clk); +} + static void sti_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm) { struct sti_pwm_chip *pc = to_sti_pwmchip(chip); @@ -249,6 +289,7 @@ static const struct pwm_ops sti_pwm_ops = { .config = sti_pwm_config, .enable = sti_pwm_enable, .disable = sti_pwm_disable, + .get_state = sti_pwm_get_state, .free = sti_pwm_free, .owner = THIS_MODULE, };