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Wysocki" , Danilo Krummrich , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Matthias Brugger , AngeloGioacchino Del Regno Cc: Chen-Yu Tsai , linux-acpi@vger.kernel.org, driver-core@lists.linux.dev, linux-pm@vger.kernel.org, linux-usb@vger.kernel.org, devicetree@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Manivannan Sadhasivam , Alan Stern Subject: [PATCH v3 03/13] power: sequencing: Add pwrseq_power_is_on() Date: Fri, 3 Jul 2026 19:03:04 +0800 Message-ID: <20260703110317.1283411-4-wenst@chromium.org> X-Mailer: git-send-email 2.55.0.rc0.799.gd6f94ed593-goog In-Reply-To: <20260703110317.1283411-1-wenst@chromium.org> References: <20260703110317.1283411-1-wenst@chromium.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The power sequencing consumer API already does power on state tracking internally. Expose the state to consumers through pwrseq_power_is_on() so that they don't have to reimplement it locally. Signed-off-by: Chen-Yu Tsai --- Changes since v2: - New patch Needs to go in with "usb: hub: Power on connected M.2 E-key connectors" as it is a build time dependency. --- drivers/power/sequencing/core.c | 18 ++++++++++++++++++ include/linux/pwrseq/consumer.h | 1 + 2 files changed, 19 insertions(+) diff --git a/drivers/power/sequencing/core.c b/drivers/power/sequencing/core.c index 02f42da91598..72b96d36920e 100644 --- a/drivers/power/sequencing/core.c +++ b/drivers/power/sequencing/core.c @@ -968,6 +968,24 @@ int pwrseq_power_off(struct pwrseq_desc *desc) } EXPORT_SYMBOL_GPL(pwrseq_power_off); +/** + * pwrseq_power_is_on() - Queries the last requested state of the power sequencer. + * @desc: Descriptor referencing the power sequencer. + * + * This returns the last requested state of the power sequencer. + * + * Returns: + * On success, 1 for on and 0 for off; negative error number on failure. + */ +int pwrseq_power_is_on(struct pwrseq_desc *desc) +{ + if (!desc) + return -EINVAL; + + return desc->powered_on; +} +EXPORT_SYMBOL_GPL(pwrseq_power_is_on); + /** * pwrseq_to_device() - Get the pwrseq device pointer from a descriptor. * @desc: Descriptor referencing the power sequencer. diff --git a/include/linux/pwrseq/consumer.h b/include/linux/pwrseq/consumer.h index 3c907c9e1885..5a5eaf85d5db 100644 --- a/include/linux/pwrseq/consumer.h +++ b/include/linux/pwrseq/consumer.h @@ -22,6 +22,7 @@ devm_pwrseq_get(struct device *dev, const char *target); int pwrseq_power_on(struct pwrseq_desc *desc); int pwrseq_power_off(struct pwrseq_desc *desc); +int pwrseq_power_is_on(struct pwrseq_desc *desc); struct device *pwrseq_to_device(struct pwrseq_desc *desc); -- 2.55.0.rc0.799.gd6f94ed593-goog