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Wed, 05 Feb 2020 11:49:00 +0100 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 57DD310002A; Wed, 5 Feb 2020 11:48:53 +0100 (CET) Received: from Webmail-eu.st.com (sfhdag5node3.st.com [10.75.127.15]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 4A8522AD9FA; Wed, 5 Feb 2020 11:48:53 +0100 (CET) Received: from localhost (10.75.127.47) by SFHDAG5NODE3.st.com (10.75.127.15) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Wed, 5 Feb 2020 11:48:52 +0100 From: Fabrice Gasnier To: , Subject: [PATCH] counter: stm32-timer-cnt: add power management support Date: Wed, 5 Feb 2020 11:47:58 +0100 Message-ID: <1580899678-26393-1-git-send-email-fabrice.gasnier@st.com> X-Mailer: git-send-email 2.7.4 MIME-Version: 1.0 X-Originating-IP: [10.75.127.47] X-ClientProxiedBy: SFHDAG1NODE3.st.com (10.75.127.3) To SFHDAG5NODE3.st.com (10.75.127.15) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138, 18.0.572 definitions=2020-02-05_03:2020-02-04, 2020-02-05 signatures=0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200205_024908_254868_43C3E831 X-CRM114-Status: GOOD ( 13.19 ) X-Spam-Score: -0.9 (/) X-Spam-Report: SpamAssassin version 3.4.3 on bombadil.infradead.org summary: Content analysis details: (-0.9 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at https://www.dnswl.org/, low trust [91.207.212.93 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain 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: alexandre.torgue@st.com, linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, mcoquelin.stm32@gmail.com, fabrice.gasnier@st.com, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, benjamin.gaignard@st.com Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org Add suspend/resume PM sleep ops. When going to low power, enforce the counter isn't active. Signed-off-by: Fabrice Gasnier Acked-by: William Breathitt Gray --- drivers/counter/stm32-timer-cnt.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/drivers/counter/stm32-timer-cnt.c b/drivers/counter/stm32-timer-cnt.c index 3eafcce..3b84503 100644 --- a/drivers/counter/stm32-timer-cnt.c +++ b/drivers/counter/stm32-timer-cnt.c @@ -12,6 +12,7 @@ #include #include #include +#include #include #define TIM_CCMR_CCXS (BIT(8) | BIT(0)) @@ -358,10 +359,33 @@ static int stm32_timer_cnt_probe(struct platform_device *pdev) priv->counter.num_signals = ARRAY_SIZE(stm32_signals); priv->counter.priv = priv; + platform_set_drvdata(pdev, priv); + /* Register Counter device */ return devm_counter_register(dev, &priv->counter); } +static int __maybe_unused stm32_timer_cnt_suspend(struct device *dev) +{ + struct stm32_timer_cnt *priv = dev_get_drvdata(dev); + u32 cr1; + + /* Check for active counter */ + regmap_read(priv->regmap, TIM_CR1, &cr1); + if (cr1 & TIM_CR1_CEN) + return -EBUSY; + + return pinctrl_pm_select_sleep_state(dev); +} + +static int __maybe_unused stm32_timer_cnt_resume(struct device *dev) +{ + return pinctrl_pm_select_default_state(dev); +} + +static SIMPLE_DEV_PM_OPS(stm32_timer_cnt_pm_ops, stm32_timer_cnt_suspend, + stm32_timer_cnt_resume); + static const struct of_device_id stm32_timer_cnt_of_match[] = { { .compatible = "st,stm32-timer-counter", }, {}, @@ -373,6 +397,7 @@ static struct platform_driver stm32_timer_cnt_driver = { .driver = { .name = "stm32-timer-counter", .of_match_table = stm32_timer_cnt_of_match, + .pm = &stm32_timer_cnt_pm_ops, }, }; module_platform_driver(stm32_timer_cnt_driver);