From patchwork Tue Jun 14 09:13:18 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Boris BREZILLON X-Patchwork-Id: 9175343 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 2057760772 for ; Tue, 14 Jun 2016 09:19:04 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0C72725EF7 for ; Tue, 14 Jun 2016 09:19:04 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id F2C5728294; Tue, 14 Jun 2016 09:19:03 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.2 required=2.0 tests=BAYES_00,FSL_HELO_HOME, RCVD_IN_DNSWL_MED autolearn=unavailable version=3.3.1 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.wl.linuxfoundation.org (Postfix) with ESMTPS id 06A1325EF7 for ; Tue, 14 Jun 2016 09:19:02 +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 1bCkTL-0002V2-6u; Tue, 14 Jun 2016 09:17:23 +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 1bCkQC-0005Qt-Ry; Tue, 14 Jun 2016 09:14:14 +0000 Received: by mail.free-electrons.com (Postfix, from userid 110) id 56BD84B9; Tue, 14 Jun 2016 11:13:31 +0200 (CEST) Received: from bbrezillon.home (LStLambert-657-1-97-87.w90-63.abo.wanadoo.fr [90.63.216.87]) by mail.free-electrons.com (Postfix) with ESMTPSA id 9A70C4A5; Tue, 14 Jun 2016 11:13:30 +0200 (CEST) From: Boris Brezillon To: Thierry Reding , linux-pwm@vger.kernel.org, Mark Brown , Liam Girdwood Subject: [PATCH v3 10/14] regulator: pwm: Switch to the atomic PWM API Date: Tue, 14 Jun 2016 11:13:18 +0200 Message-Id: <1465895602-31008-11-git-send-email-boris.brezillon@free-electrons.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1465895602-31008-1-git-send-email-boris.brezillon@free-electrons.com> References: <1465895602-31008-1-git-send-email-boris.brezillon@free-electrons.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160614_021409_509448_5E288D0D X-CRM114-Status: GOOD ( 15.90 ) 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: Mark Rutland , Milo Kim , Heiko Stuebner , Patrice Chotard , Laxman Dewangan , kernel@stlinux.com, Boris Brezillon , Brian Norris , Stephen Barber , linux-rockchip@lists.infradead.org, Caesar Wang , devicetree@vger.kernel.org, Pawel Moll , Ian Campbell , Doug Anderson , Rob Herring , linux-arm-kernel@lists.infradead.org, Maxime Coquelin , Srinivas Kandagatla , linux-kernel@vger.kernel.org, Kumar Gala , Ajit Pal Singh 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 Use the atomic API wherever appropriate and get rid of pwm_apply_args() call (the reference period and polarity are now explicitly set when calling pwm_apply_state()). We also make use of the pwm_set_relative_duty_cycle() helper to ease relative to absolute duty_cycle conversion. Note that changes introduced by commit fd786fb0276a ("regulator: pwm: Try to avoid voltage error in duty cycle calculation") are no longer needed because pwm_set_relative_duty_cycle() takes care of all rounding approximation for us. Signed-off-by: Boris Brezillon Reviewed-by: Brian Norris Tested-by: Brian Norris Acked-by: Laxman Dewangan Tested-by: Heiko Stuebner Acked-by: Mark Brown --- drivers/regulator/pwm-regulator.c | 38 ++++++++++---------------------------- 1 file changed, 10 insertions(+), 28 deletions(-) diff --git a/drivers/regulator/pwm-regulator.c b/drivers/regulator/pwm-regulator.c index 524b43f..ad75360 100644 --- a/drivers/regulator/pwm-regulator.c +++ b/drivers/regulator/pwm-regulator.c @@ -59,16 +59,14 @@ static int pwm_regulator_set_voltage_sel(struct regulator_dev *rdev, unsigned selector) { struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev); - struct pwm_args pargs; - int dutycycle; + struct pwm_state pstate; int ret; - pwm_get_args(drvdata->pwm, &pargs); + pwm_init_state(drvdata->pwm, &pstate); + pwm_set_relative_duty_cycle(&pstate, + drvdata->duty_cycle_table[selector].dutycycle, 100); - dutycycle = (pargs.period * - drvdata->duty_cycle_table[selector].dutycycle) / 100; - - ret = pwm_config(drvdata->pwm, dutycycle, pargs.period); + ret = pwm_apply_state(drvdata->pwm, &pstate); if (ret) { dev_err(&rdev->dev, "Failed to configure PWM: %d\n", ret); return ret; @@ -126,34 +124,18 @@ static int pwm_regulator_set_voltage(struct regulator_dev *rdev, { struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev); unsigned int ramp_delay = rdev->constraints->ramp_delay; - struct pwm_args pargs; unsigned int req_diff = min_uV - rdev->constraints->min_uV; + struct pwm_state pstate; unsigned int diff; - unsigned int duty_pulse; - u64 req_period; - u32 rem; int ret; - pwm_get_args(drvdata->pwm, &pargs); + pwm_init_state(drvdata->pwm, &pstate); diff = rdev->constraints->max_uV - rdev->constraints->min_uV; - /* First try to find out if we get the iduty cycle time which is - * factor of PWM period time. If (request_diff_to_min * pwm_period) - * is perfect divided by voltage_range_diff then it is possible to - * get duty cycle time which is factor of PWM period. This will help - * to get output voltage nearer to requested value as there is no - * calculation loss. - */ - req_period = req_diff * pargs.period; - div_u64_rem(req_period, diff, &rem); - if (!rem) { - do_div(req_period, diff); - duty_pulse = (unsigned int)req_period; - } else { - duty_pulse = (pargs.period / 100) * ((req_diff * 100) / diff); - } + /* We pass diff as the scale to get a uV precision. */ + pwm_set_relative_duty_cycle(&pstate, req_diff, diff); - ret = pwm_config(drvdata->pwm, duty_pulse, pargs.period); + ret = pwm_apply_state(drvdata->pwm, &pstate); if (ret) { dev_err(&rdev->dev, "Failed to configure PWM: %d\n", ret); return ret;