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[109.252.193.91]) by smtp.gmail.com with ESMTPSA id q27sm2680275ljm.127.2021.05.16.15.21.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 16 May 2021 15:21:26 -0700 (PDT) From: Dmitry Osipenko To: Thierry Reding , Jonathan Hunter , =?UTF-8?q?Micha=C5=82=20Miros=C5=82aw?= , =?UTF-8?q?Nikola=20Milosavljevi=C4=87?= Cc: linux-kernel@vger.kernel.org, linux-tegra@vger.kernel.org, Mark Brown , Liam Girdwood Subject: [PATCH v2 1/2] regulator: core: Add regulator_sync_voltage_rdev() Date: Mon, 17 May 2021 01:21:01 +0300 Message-Id: <20210516222103.28595-2-digetx@gmail.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210516222103.28595-1-digetx@gmail.com> References: <20210516222103.28595-1-digetx@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-tegra@vger.kernel.org Some NVIDIA Tegra devices use a CPU soft-reset method for the reboot and in this case we need to restore the coupled voltages to the state that is suitable for hardware during boot. Add new regulator_sync_voltage_rdev() helper which is needed by regulator drivers in order to sync voltage of a coupled regulators. Acked-by: Mark Brown Signed-off-by: Dmitry Osipenko --- drivers/regulator/core.c | 23 +++++++++++++++++++++++ include/linux/regulator/driver.h | 1 + 2 files changed, 24 insertions(+) diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index f192bf19492e..ead0b6d2af45 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -4105,6 +4105,29 @@ int regulator_set_voltage_time_sel(struct regulator_dev *rdev, } EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); +int regulator_sync_voltage_rdev(struct regulator_dev *rdev) +{ + int ret; + + regulator_lock(rdev); + + if (!rdev->desc->ops->set_voltage && + !rdev->desc->ops->set_voltage_sel) { + ret = -EINVAL; + goto out; + } + + /* balance only, if regulator is coupled */ + if (rdev->coupling_desc.n_coupled > 1) + ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON); + else + ret = -EOPNOTSUPP; + +out: + regulator_unlock(rdev); + return ret; +} + /** * regulator_sync_voltage - re-apply last regulator output voltage * @regulator: regulator source diff --git a/include/linux/regulator/driver.h b/include/linux/regulator/driver.h index 4ea520c248e9..35e5a611db81 100644 --- a/include/linux/regulator/driver.h +++ b/include/linux/regulator/driver.h @@ -540,6 +540,7 @@ int regulator_set_current_limit_regmap(struct regulator_dev *rdev, int regulator_get_current_limit_regmap(struct regulator_dev *rdev); void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data); int regulator_set_ramp_delay_regmap(struct regulator_dev *rdev, int ramp_delay); +int regulator_sync_voltage_rdev(struct regulator_dev *rdev); /* * Helper functions intended to be used by regulator drivers prior registering -- 2.30.2