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Wysocki" , Danilo Krummrich , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Matthias Brugger , AngeloGioacchino Del Regno Cc: Wei Deng , 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 , Bartosz Golaszewski Subject: [PATCH v5 03/16] power: sequencing: Add pwrseq_power_is_on() Date: Wed, 15 Jul 2026 16:53:33 +0800 Message-ID: <20260715085348.3457359-4-wenst@chromium.org> X-Mailer: git-send-email 2.55.0.141.g00534a21ce-goog In-Reply-To: <20260715085348.3457359-1-wenst@chromium.org> References: <20260715085348.3457359-1-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. Acked-by: Bartosz Golaszewski Signed-off-by: Chen-Yu Tsai --- Changes since v4: - Make pwrseq_power_is_on() return 1 if descriptor is NULL, i.e. if the descriptor is optional, matching the other pwrseq consumer APIs Changes since v3: - Added missing stub function for !POWER_SEQUENCING 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. Bartosz wants the change on an immutable branch to pull into the pwrseq tree. --- drivers/power/sequencing/core.c | 19 +++++++++++++++++++ include/linux/pwrseq/consumer.h | 6 ++++++ 2 files changed, 25 insertions(+) diff --git a/drivers/power/sequencing/core.c b/drivers/power/sequencing/core.c index 02f42da91598..db8c91be10c9 100644 --- a/drivers/power/sequencing/core.c +++ b/drivers/power/sequencing/core.c @@ -968,6 +968,25 @@ 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 or desc is NULL (optional) and 0 for off; + * negative error number on failure. + */ +int pwrseq_power_is_on(struct pwrseq_desc *desc) +{ + if (!desc) + return 1; + + 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..3c6122bd0205 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); @@ -53,6 +54,11 @@ static inline int pwrseq_power_off(struct pwrseq_desc *desc) return -ENOSYS; } +static inline int pwrseq_power_is_on(struct pwrseq_desc *desc) +{ + return -ENOSYS; +} + static inline struct device *pwrseq_to_device(struct pwrseq_desc *desc) { return NULL; -- 2.55.0.795.g602f6c329a-goog