Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755427AbcC3UNg (ORCPT ); Wed, 30 Mar 2016 16:13:36 -0400 Received: from down.free-electrons.com ([37.187.137.238]:45415 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1755265AbcC3UFc (ORCPT ); Wed, 30 Mar 2016 16:05:32 -0400 From: Boris Brezillon To: Thierry Reding , linux-pwm@vger.kernel.org Cc: Mike Turquette , Stephen Boyd , linux-clk@vger.kernel.org, Mark Brown , Liam Girdwood , Kamil Debski , lm-sensors@lm-sensors.org, Jean Delvare , Guenter Roeck , Dmitry Torokhov , linux-input@vger.kernel.org, Bryan Wu , Richard Purdie , Jacek Anaszewski , linux-leds@vger.kernel.org, Maxime Ripard , Chen-Yu Tsai , linux-sunxi@googlegroups.com, Joachim Eastwood , Thomas Petazzoni , Heiko Stuebner , linux-rockchip@lists.infradead.org, Jingoo Han , Lee Jones , linux-fbdev@vger.kernel.org, Jean-Christophe Plagniol-Villard , Tomi Valkeinen , Robert Jarzmik , Alexandre Belloni , Kukjin Kim , Krzysztof Kozlowski , linux-samsung-soc@vger.kernel.org, intel-gfx@lists.freedesktop.org, Daniel Vetter , Jani Nikula , Jonathan Corbet , linux-doc@vger.kernel.org, David Airlie , Daniel Vetter , dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Hartley Sweeten , Ryan Mallon , Alexander Shiyan , Milo Kim , Boris Brezillon 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> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1937 Lines: 68 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, }; -- 2.5.0