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[98.183.112.25]) by smtp.gmail.com with ESMTPSA id js3-20020a056870bac300b0022a0519183csm81381oab.2.2024.03.27.16.19.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 27 Mar 2024 16:19:03 -0700 (PDT) From: David Lechner To: Jonathan Corbet , Liam Girdwood , Mark Brown , Jean Delvare , Guenter Roeck , Support Opensource , Cosmin Tanislav , Lars-Peter Clausen , Michael Hennerich , Jonathan Cameron , Antoniu Miclaus , Greg Kroah-Hartman , Dmitry Torokhov Cc: David Lechner , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-iio@vger.kernel.org, linux-staging@lists.linux.dev, linux-input@vger.kernel.org Subject: [PATCH RFC 1/7] regulator: devres: add APIs for reference supplies Date: Wed, 27 Mar 2024 18:18:50 -0500 Message-ID: <20240327-regulator-get-enable-get-votlage-v1-1-5f4517faa059@baylibre.com> X-Mailer: git-send-email 2.43.2 In-Reply-To: <20240327-regulator-get-enable-get-votlage-v1-0-5f4517faa059@baylibre.com> References: <20240327-regulator-get-enable-get-votlage-v1-0-5f4517faa059@baylibre.com> Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Mailer: b4 0.12.4 A common use case for regulators is to supply a reference voltage to an analog input or output device. This adds two new devres APIs to get, enable, and get the voltage in a single call. This allows eliminating boilerplate code in drivers that use reference supplies in this way. devm_regulator_get_enable_get_voltage() is intended for cases where the supply is required to provide an external reference voltage. devm_regulator_get_optional_enable_get_voltage() is intended for cases where the supply is optional and device typically uses an internal reference voltage if the supply is not available. Signed-off-by: David Lechner --- Documentation/driver-api/driver-model/devres.rst | 2 + drivers/regulator/devres.c | 83 ++++++++++++++++++++++++ include/linux/regulator/consumer.h | 14 ++++ 3 files changed, 99 insertions(+) diff --git a/Documentation/driver-api/driver-model/devres.rst b/Documentation/driver-api/driver-model/devres.rst index 7be8b8dd5f00..fd954d09e13c 100644 --- a/Documentation/driver-api/driver-model/devres.rst +++ b/Documentation/driver-api/driver-model/devres.rst @@ -433,9 +433,11 @@ REGULATOR devm_regulator_bulk_put() devm_regulator_get() devm_regulator_get_enable() + devm_regulator_get_enable_get_voltage() devm_regulator_get_enable_optional() devm_regulator_get_exclusive() devm_regulator_get_optional() + devm_regulator_get_optional_enable_get_voltage() devm_regulator_irq_helper() devm_regulator_put() devm_regulator_register() diff --git a/drivers/regulator/devres.c b/drivers/regulator/devres.c index 90bb0d178885..e240926defc5 100644 --- a/drivers/regulator/devres.c +++ b/drivers/regulator/devres.c @@ -145,6 +145,89 @@ struct regulator *devm_regulator_get_optional(struct device *dev, } EXPORT_SYMBOL_GPL(devm_regulator_get_optional); +static int _devm_regulator_get_enable_get_voltage(struct device *dev, + const char *id, + bool silent_enodev) +{ + struct regulator *r; + int ret; + + /* + * Since we need a real voltage, we use devm_regulator_get_optional() + * here to avoid getting a dummy regulator if the supply is not present. + */ + r = devm_regulator_get_optional(dev, id); + if (silent_enodev && PTR_ERR(r) == -ENODEV) + return -ENODEV; + if (IS_ERR(r)) + return dev_err_probe(dev, PTR_ERR(r), + "failed to get regulator '%s'\n", id); + + ret = regulator_enable(r); + if (ret) + return dev_err_probe(dev, ret, + "failed to enable regulator '%s'\n", id); + + ret = devm_add_action_or_reset(dev, regulator_action_disable, r); + if (ret) + return dev_err_probe(dev, ret, + "failed to add disable action for regulator '%s'\n", + id); + + ret = regulator_get_voltage(r); + if (ret < 0) + return dev_err_probe(dev, ret, + "failed to get voltage for regulator '%s'\n", + id); + + return ret; +} + +/** + * devm_regulator_get_enable_get_voltage - Resource managed regulator get and + * enable that returns the voltage + * @dev: device to supply + * @id: supply name or regulator ID. + * + * Get and enable regulator for duration of the device life-time. + * regulator_disable() and regulator_put() are automatically called on driver + * detach. See regulator_get_optional(), regulator_enable(), and + * regulator_get_voltage() for more information. + * + * This is a convenience function for supplies that provide a reference voltage + * where the consumer driver just needs to know the voltage and keep the + * regulator enabled. Also, as a convenience, this prints error messages on + * failure. + * + * Returns: voltage in microvolts on success, or an error code on failure. + */ +int devm_regulator_get_enable_get_voltage(struct device *dev, const char *id) +{ + return _devm_regulator_get_enable_get_voltage(dev, id, false); +} +EXPORT_SYMBOL_GPL(devm_regulator_get_enable_get_voltage); + +/** + * devm_regulator_get_optional_enable_get_voltage - Resource managed regulator + * get and enable that returns + * the voltage + * @dev: device to supply + * @id: supply name or regulator ID. + * + * This function is identical to devm_regulator_get_enable_get_voltage() except + * that it does not print an error message in the case of -ENODEV. Callers are + * expected to handle -ENODEV as a special case instead of passing it on as an + * error. + * + * Returns: voltage in microvolts on success, or an error code on failure. + */ +int devm_regulator_get_optional_enable_get_voltage(struct device *dev, + const char *id) +{ + return _devm_regulator_get_enable_get_voltage(dev, id, true); +} +EXPORT_SYMBOL_GPL(devm_regulator_get_optional_enable_get_voltage); + static int devm_regulator_match(struct device *dev, void *res, void *data) { struct regulator **r = res; diff --git a/include/linux/regulator/consumer.h b/include/linux/regulator/consumer.h index 4660582a3302..35596db521a0 100644 --- a/include/linux/regulator/consumer.h +++ b/include/linux/regulator/consumer.h @@ -164,6 +164,8 @@ struct regulator *__must_check devm_regulator_get_optional(struct device *dev, const char *id); int devm_regulator_get_enable(struct device *dev, const char *id); int devm_regulator_get_enable_optional(struct device *dev, const char *id); +int devm_regulator_get_enable_get_voltage(struct device *dev, const char *id); +int devm_regulator_get_optional_enable_get_voltage(struct device *dev, const char *id); void regulator_put(struct regulator *regulator); void devm_regulator_put(struct regulator *regulator); @@ -329,6 +331,18 @@ static inline int devm_regulator_get_enable_optional(struct device *dev, return -ENODEV; } +static inline int devm_regulator_get_enable_get_voltage(struct device *dev, + const char *id) +{ + return -ENODEV; +} + +static inline int devm_regulator_get_optional_enable_get_voltage(struct device *dev, + const char *id) +{ + return -ENODEV; +} + static inline struct regulator *__must_check regulator_get_optional(struct device *dev, const char *id) {