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Wed, 26 Feb 2020 23:47:41 -0800 Received: from mtkmbs05n2.mediatek.inc (172.21.101.140) by MTKMBS62N1.mediatek.inc (172.29.193.41) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Wed, 26 Feb 2020 23:48:20 -0800 Received: from mtkcas08.mediatek.inc (172.21.101.126) by mtkmbs05n2.mediatek.inc (172.21.101.140) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Thu, 27 Feb 2020 15:46:40 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkcas08.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1395.4 via Frontend Transport; Thu, 27 Feb 2020 15:47:42 +0800 From: Sam Shih To: Thierry Reding , =?utf-8?q?Uwe_Kleine-K=C3=B6n?= =?utf-8?q?ig?= , Matthias Brugger Subject: [PATCH 1/1] pwm: mediatek: add longer period support Date: Thu, 27 Feb 2020 15:46:50 +0800 Message-ID: <1582789610-23133-2-git-send-email-sam.shih@mediatek.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1582789610-23133-1-git-send-email-sam.shih@mediatek.com> References: <1582789610-23133-1-git-send-email-sam.shih@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200226_234749_588042_E70A6F6E X-CRM114-Status: GOOD ( 11.53 ) X-Spam-Score: -0.2 (/) X-Spam-Report: SpamAssassin version 3.4.3 on bombadil.infradead.org summary: Content analysis details: (-0.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [216.200.240.184 listed in list.dnswl.org] 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record 0.0 MIME_BASE64_TEXT RAW: Message text disguised using base64 encoding -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.0 UNPARSEABLE_RELAY Informational: message has unparseable relay lines X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-pwm@vger.kernel.org, Sam Shih , linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org, John Crispin , linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org The pwm clock source could be divided by 1625 with PWM_CON BIT(3) setting in mediatek hardware. This patch add support for longer pwm period configuration, which allowing blinking LEDs via pwm interface. Signed-off-by: Sam Shih --- drivers/pwm/pwm-mediatek.c | 21 +++++++++++++++++---- 1 file changed, 17 insertions(+), 4 deletions(-) diff --git a/drivers/pwm/pwm-mediatek.c b/drivers/pwm/pwm-mediatek.c index b94e0d09c300..9af309bea01a 100644 --- a/drivers/pwm/pwm-mediatek.c +++ b/drivers/pwm/pwm-mediatek.c @@ -121,8 +121,8 @@ static int pwm_mediatek_config(struct pwm_chip *chip, struct pwm_device *pwm, int duty_ns, int period_ns) { struct pwm_mediatek_chip *pc = to_pwm_mediatek_chip(chip); - u32 clkdiv = 0, cnt_period, cnt_duty, reg_width = PWMDWIDTH, - reg_thres = PWMTHRES; + u32 clkdiv = 0, clksel = 0, cnt_period, cnt_duty, + reg_width = PWMDWIDTH, reg_thres = PWMTHRES; u64 resolution; int ret; @@ -141,9 +141,18 @@ static int pwm_mediatek_config(struct pwm_chip *chip, struct pwm_device *pwm, clkdiv++; cnt_period = DIV_ROUND_CLOSEST_ULL((u64)period_ns * 1000, resolution); + if (clkdiv > PWM_CLK_DIV_MAX && !clksel) { + clksel = 1; + clkdiv = 0; + resolution = (u64)NSEC_PER_SEC * 1000 * 1625; + do_div(resolution, + clk_get_rate(pc->clk_pwms[pwm->hwpwm])); + cnt_period = DIV_ROUND_CLOSEST_ULL( + (u64)period_ns * 1000, resolution); + } } - if (clkdiv > PWM_CLK_DIV_MAX) { + if (clkdiv > PWM_CLK_DIV_MAX && clksel) { pwm_mediatek_clk_disable(chip, pwm); dev_err(chip->dev, "period %d not supported\n", period_ns); return -EINVAL; @@ -159,7 +168,11 @@ static int pwm_mediatek_config(struct pwm_chip *chip, struct pwm_device *pwm, } cnt_duty = DIV_ROUND_CLOSEST_ULL((u64)duty_ns * 1000, resolution); - pwm_mediatek_writel(pc, pwm->hwpwm, PWMCON, BIT(15) | clkdiv); + if (clksel) + pwm_mediatek_writel(pc, pwm->hwpwm, PWMCON, BIT(15) | BIT(3) | + clkdiv); + else + pwm_mediatek_writel(pc, pwm->hwpwm, PWMCON, BIT(15) | clkdiv); pwm_mediatek_writel(pc, pwm->hwpwm, reg_width, cnt_period); pwm_mediatek_writel(pc, pwm->hwpwm, reg_thres, cnt_duty);