From patchwork Sat Mar 2 23:33:59 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul Cercueil X-Patchwork-Id: 10836873 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 5574817EF for ; Sat, 2 Mar 2019 23:36:00 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 455E02A57F for ; Sat, 2 Mar 2019 23:36:00 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 39B392A586; Sat, 2 Mar 2019 23:36:00 +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=-7.7 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B8C502A582 for ; Sat, 2 Mar 2019 23:35:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727250AbfCBXfy (ORCPT ); Sat, 2 Mar 2019 18:35:54 -0500 Received: from outils.crapouillou.net ([89.234.176.41]:34384 "EHLO crapouillou.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726958AbfCBXfx (ORCPT ); Sat, 2 Mar 2019 18:35:53 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=crapouillou.net; s=mail; t=1551569750; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:content-type: content-transfer-encoding:in-reply-to:in-reply-to: references:references; bh=bNrt35JIP1EJ9SZv42mKntmeQEDItMZvplduG2u//DI=; b=Q5fikHtfmLQC1MYR791RIGQLBhzU9QmxumKX68sdcr92oUjqtRSLNi/4JWdYRw9PBzqhmk HExb7ZND3amhpISNvpq8CsYtMAPxEQHAxNKo9bcdonsuPhO/1gtXeUoqSBPJ0cv/6wajki Xr48UN2refz27JsXJGw5J34Vvo5laME= From: Paul Cercueil To: Thierry Reding , Daniel Lezcano , Thomas Gleixner , Ralf Baechle , Paul Burton , James Hogan , Jonathan Corbet , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= Cc: Mathieu Malaterre , od@zcrc.me, linux-pwm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-watchdog@vger.kernel.org, linux-mips@vger.kernel.org, linux-doc@vger.kernel.org, linux-clk@vger.kernel.org, Paul Cercueil Subject: [PATCH v10 13/27] pwm: jz4740: Use clocks from TCU driver Date: Sat, 2 Mar 2019 20:33:59 -0300 Message-Id: <20190302233413.14813-14-paul@crapouillou.net> In-Reply-To: <20190302233413.14813-1-paul@crapouillou.net> References: <20190302233413.14813-1-paul@crapouillou.net> Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The ingenic-timer "TCU" driver provides us with clocks, that can be (un)gated, reparented or reclocked from devicetree, instead of having these settings hardcoded in this driver. While this driver is devicetree-compatible, it is never (as of now) probed from devicetree, so this change does not introduce a ABI problem with current devicetree files. Note that the "select REGMAP" has been dropped because it's already enabled by the "select INGENIC_TIMER". Signed-off-by: Paul Cercueil Tested-by: Mathieu Malaterre Tested-by: Artur Rojek --- Notes: v9: New patch v10: Explain in commit message why "select REGMAP" was dropped drivers/pwm/Kconfig | 3 ++- drivers/pwm/pwm-jz4740.c | 39 ++++++++++++++++++++++++++------------- 2 files changed, 28 insertions(+), 14 deletions(-) diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig index ace8ea4b6247..4e201e970509 100644 --- a/drivers/pwm/Kconfig +++ b/drivers/pwm/Kconfig @@ -204,7 +204,8 @@ config PWM_IMX config PWM_JZ4740 tristate "Ingenic JZ47xx PWM support" depends on MACH_INGENIC - select REGMAP + depends on COMMON_CLK + select INGENIC_TIMER help Generic PWM framework driver for Ingenic JZ47xx based machines. diff --git a/drivers/pwm/pwm-jz4740.c b/drivers/pwm/pwm-jz4740.c index 8dfac5ffd71c..c6136bd4434b 100644 --- a/drivers/pwm/pwm-jz4740.c +++ b/drivers/pwm/pwm-jz4740.c @@ -28,7 +28,7 @@ struct jz4740_pwm_chip { struct pwm_chip chip; - struct clk *clk; + struct clk *clks[NUM_PWM]; struct regmap *map; }; @@ -40,6 +40,9 @@ static inline struct jz4740_pwm_chip *to_jz4740(struct pwm_chip *chip) static int jz4740_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm) { struct jz4740_pwm_chip *jz = to_jz4740(chip); + struct clk *clk; + char clk_name[16]; + int ret; /* * Timers 0 and 1 are used for system tasks, so they are unavailable @@ -48,16 +51,29 @@ static int jz4740_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm) if (pwm->hwpwm < 2) return -EBUSY; - regmap_write(jz->map, TCU_REG_TSCR, BIT(pwm->hwpwm)); + snprintf(clk_name, sizeof(clk_name), "timer%u", pwm->hwpwm); + clk = clk_get(chip->dev, clk_name); + if (IS_ERR(clk)) + return PTR_ERR(clk); + + ret = clk_prepare_enable(clk); + if (ret) { + clk_put(clk); + return ret; + } + + jz->clks[pwm->hwpwm] = clk; return 0; } static void jz4740_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm) { struct jz4740_pwm_chip *jz = to_jz4740(chip); + struct clk *clk = jz->clks[pwm->hwpwm]; - regmap_write(jz->map, TCU_REG_TSCR, BIT(pwm->hwpwm)); + clk_disable_unprepare(clk); + clk_put(clk); } static int jz4740_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm) @@ -92,16 +108,20 @@ static int jz4740_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, struct pwm_state *state) { struct jz4740_pwm_chip *jz4740 = to_jz4740(pwm->chip); + struct clk *clk = jz4740->clks[pwm->hwpwm], + *parent_clk = clk_get_parent(clk); + unsigned long rate, period, duty; unsigned long long tmp; - unsigned long period, duty; unsigned int prescaler = 0; - tmp = (unsigned long long)clk_get_rate(jz4740->clk) * state->period; + rate = clk_get_rate(parent_clk); + tmp = (unsigned long long)rate * state->period; do_div(tmp, 1000000000); period = tmp; while (period > 0xffff && prescaler < 6) { period >>= 2; + rate >>= 2; ++prescaler; } @@ -121,10 +141,7 @@ static int jz4740_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, regmap_update_bits(jz4740->map, TCU_REG_TCSRc(pwm->hwpwm), TCU_TCSR_PWM_SD, TCU_TCSR_PWM_SD); - /* Set clock prescale */ - regmap_update_bits(jz4740->map, TCU_REG_TCSRc(pwm->hwpwm), - TCU_TCSR_PRESCALE_MASK, - prescaler << TCU_TCSR_PRESCALE_LSB); + clk_set_rate(clk, rate); /* Reset counter to 0 */ regmap_write(jz4740->map, TCU_REG_TCNTc(pwm->hwpwm), 0); @@ -170,10 +187,6 @@ static int jz4740_pwm_probe(struct platform_device *pdev) if (!jz4740) return -ENOMEM; - jz4740->clk = devm_clk_get(&pdev->dev, "ext"); - if (IS_ERR(jz4740->clk)) - return PTR_ERR(jz4740->clk); - jz4740->map = dev_get_regmap(dev->parent, NULL); if (!jz4740->map) { dev_err(dev, "regmap not found\n");