From patchwork Thu Aug 20 22:55:45 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandre Belloni X-Patchwork-Id: 1348678 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-pwm-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=bootlin.com Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4BXg440Cz5z9sT6 for ; Fri, 21 Aug 2020 08:56:04 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728634AbgHTW4C (ORCPT ); Thu, 20 Aug 2020 18:56:02 -0400 Received: from relay11.mail.gandi.net ([217.70.178.231]:50013 "EHLO relay11.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728611AbgHTW4B (ORCPT ); Thu, 20 Aug 2020 18:56:01 -0400 Received: from localhost (lfbn-lyo-1-1932-79.w90-66.abo.wanadoo.fr [90.66.108.79]) (Authenticated sender: alexandre.belloni@bootlin.com) by relay11.mail.gandi.net (Postfix) with ESMTPSA id 74499100005; Thu, 20 Aug 2020 22:55:58 +0000 (UTC) From: Alexandre Belloni To: Thierry Reding , =?utf-8?q?Uwe_Kleine-K=C3=B6n?= =?utf-8?q?ig?= Cc: Nicolas Ferre , linux-pwm@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Alexandre Belloni Subject: [PATCH 3/4] pwm: atmel-tcb: add sama5d2 support Date: Fri, 21 Aug 2020 00:55:45 +0200 Message-Id: <20200820225546.2246517-4-alexandre.belloni@bootlin.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200820225546.2246517-1-alexandre.belloni@bootlin.com> References: <20200820225546.2246517-1-alexandre.belloni@bootlin.com> MIME-Version: 1.0 Sender: linux-pwm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pwm@vger.kernel.org Add sama5d2 support. The sama5d2 has a new clock input, its gclk. Index 0 of the clock selector is the gclk instead of the peripheral clock divided by 2. For now, the gclk is not used because the peripheral clock divided by 8 already gives a 9.6ns resolution which is enough for most use cases. Signed-off-by: Alexandre Belloni --- drivers/pwm/pwm-atmel-tcb.c | 23 ++++++++++++++++++++--- 1 file changed, 20 insertions(+), 3 deletions(-) diff --git a/drivers/pwm/pwm-atmel-tcb.c b/drivers/pwm/pwm-atmel-tcb.c index 82edb44fbbd8..5ccc3e7420e9 100644 --- a/drivers/pwm/pwm-atmel-tcb.c +++ b/drivers/pwm/pwm-atmel-tcb.c @@ -55,6 +55,7 @@ struct atmel_tcb_pwm_chip { u8 width; struct regmap *regmap; struct clk *clk; + struct clk *gclk; struct clk *slow_clk; struct atmel_tcb_pwm_device *pwms[NPWM]; struct atmel_tcb_channel bkup; @@ -292,7 +293,7 @@ static int atmel_tcb_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip); struct atmel_tcb_pwm_device *tcbpwm = pwm_get_chip_data(pwm); struct atmel_tcb_pwm_device *atcbpwm = NULL; - int i; + int i = 0; int slowclk = 0; unsigned period; unsigned duty; @@ -303,8 +304,11 @@ static int atmel_tcb_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, /* * Find best clk divisor: * the smallest divisor which can fulfill the period_ns requirements. + * If there is a gclk, the first divisor is actuallly the gclk selector */ - for (i = 0; i < ARRAY_SIZE(atmel_tcb_divisors); ++i) { + if (tcbpwmc->gclk) + i = 1; + for (; i < ARRAY_SIZE(atmel_tcb_divisors); ++i) { if (atmel_tcb_divisors[i] == 0) { slowclk = i; continue; @@ -383,9 +387,15 @@ static struct atmel_tcb_config tcb_sam9x5_config = { .counter_width = 32, }; +static struct atmel_tcb_config tcb_sama5d2_config = { + .counter_width = 32, + .has_gclk = 1, +}; + static const struct of_device_id atmel_tcb_of_match[] = { { .compatible = "atmel,at91rm9200-tcb", .data = &tcb_rm9200_config, }, { .compatible = "atmel,at91sam9x5-tcb", .data = &tcb_sam9x5_config, }, + { .compatible = "atmel,sama5d2-tcb", .data = &tcb_sama5d2_config, }, { /* sentinel */ } }; @@ -396,7 +406,7 @@ static int atmel_tcb_pwm_probe(struct platform_device *pdev) const struct atmel_tcb_config *config; struct device_node *np = pdev->dev.of_node; struct regmap *regmap; - struct clk *clk; + struct clk *clk, *gclk = NULL; struct clk *slow_clk; char clk_name[] = "t0_clk"; int err; @@ -428,6 +438,12 @@ static int atmel_tcb_pwm_probe(struct platform_device *pdev) match = of_match_node(atmel_tcb_of_match, np->parent); config = match->data; + if (config->has_gclk) { + gclk = of_clk_get_by_name(np->parent, "gclk"); + if (IS_ERR(gclk)) + return PTR_ERR(gclk); + } + tcbpwm = devm_kzalloc(&pdev->dev, sizeof(*tcbpwm), GFP_KERNEL); if (tcbpwm == NULL) { err = -ENOMEM; @@ -443,6 +459,7 @@ static int atmel_tcb_pwm_probe(struct platform_device *pdev) tcbpwm->channel = channel; tcbpwm->regmap = regmap; tcbpwm->clk = clk; + tcbpwm->gclk = gclk; tcbpwm->slow_clk = slow_clk; tcbpwm->width = config->counter_width;