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[2a02:8389:41cf:e200:b3d8:5b4b:5188:4373]) by smtp.gmail.com with ESMTPSA id n22-20020a05640205d600b00566d6950d14sm2783250edx.92.2024.03.03.13.54.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 03 Mar 2024 13:54:27 -0800 (PST) From: Javier Carrasco Date: Sun, 03 Mar 2024 22:54:22 +0100 Subject: [PATCH v3 3/3] iio: humidity: hdc3020: add reset management Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240303-hdc3020-pm-v3-3-48bc02b5241b@gmail.com> References: <20240303-hdc3020-pm-v3-0-48bc02b5241b@gmail.com> In-Reply-To: <20240303-hdc3020-pm-v3-0-48bc02b5241b@gmail.com> To: Jonathan Cameron , Lars-Peter Clausen , Li peiyu <579lpy@gmail.com>, Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: Jonathan Cameron , linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org, devicetree@vger.kernel.org, Javier Carrasco X-Mailer: b4 0.14-dev X-Developer-Signature: v=1; a=ed25519-sha256; t=1709502861; l=2300; i=javier.carrasco.cruz@gmail.com; s=20230509; h=from:subject:message-id; bh=aVC+szChqUVwP9dorH1s8x/ORY9BRZBBC5IcgeZmXjg=; b=xhvMcJZaOIgBiJ8bzYqJ/tYs7KdeFM+Wd6KN70+V7hWYPyQ2kzRvnmsoX3Zm9WEFQFe2IKYAg tg+4Ko2kB1QAgRb8ys164IE+lFVQKv8CSAOa57mZnOoVr73mFaO8t2L X-Developer-Key: i=javier.carrasco.cruz@gmail.com; a=ed25519; pk=tIGJV7M+tCizagNijF0eGMBGcOsPD+0cWGfKjl4h6K8= X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1792543743769072483 X-GMAIL-MSGID: 1792543743769072483 The HDC3020 provides an active low reset signal that must be handled if connected. Asserting this signal turns the device into Trigger-on Demand measurement mode, reducing its power consumption when no measurements are required like in low-power modes. According to the datasheet, the longest "Reset Ready" is 3 ms, which is only taken into account if the reset signal is defined. Signed-off-by: Javier Carrasco --- drivers/iio/humidity/hdc3020.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/iio/humidity/hdc3020.c b/drivers/iio/humidity/hdc3020.c index 7f93024b850c..cdc4789213ba 100644 --- a/drivers/iio/humidity/hdc3020.c +++ b/drivers/iio/humidity/hdc3020.c @@ -15,6 +15,7 @@ #include #include #include +#include #include #include #include @@ -70,6 +71,7 @@ struct hdc3020_data { struct i2c_client *client; + struct gpio_desc *reset_gpio; struct regulator *vdd_supply; /* * Ensure that the sensor configuration (currently only heater is @@ -558,6 +560,9 @@ static int hdc3020_power_off(struct hdc3020_data *data) { hdc3020_exec_cmd(data, HDC3020_EXIT_AUTO); + if (data->reset_gpio) + gpiod_set_value_cansleep(data->reset_gpio, 1); + return regulator_disable(data->vdd_supply); } @@ -571,6 +576,11 @@ static int hdc3020_power_on(struct hdc3020_data *data) fsleep(5000); + if (data->reset_gpio) { + gpiod_set_value_cansleep(data->reset_gpio, 0); + fsleep(3000); + } + if (data->client->irq) { /* * The alert output is activated by default upon power up, @@ -627,6 +637,12 @@ static int hdc3020_probe(struct i2c_client *client) return dev_err_probe(&client->dev, PTR_ERR(data->vdd_supply), "Unable to get VDD regulator\n"); + data->reset_gpio = devm_gpiod_get_optional(&client->dev, "reset", + GPIOD_OUT_HIGH); + if (IS_ERR(data->reset_gpio)) + return dev_err_probe(&client->dev, PTR_ERR(data->reset_gpio), + "Cannot get reset GPIO\n"); + ret = hdc3020_power_on(data); if (ret) return dev_err_probe(&client->dev, ret, "Power on failed\n");