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path: root/drivers/regulator/bd9571mwv-regulator.c
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2018-04-23regulator: bd9571mwv: Add support for backup modeGeert Uytterhoeven1-1/+126
The BD9571MWV PMIC supports backup mode, which keeps one or more DDR rails powered while the main SoC is powered down. Which DDR rails are to be kept powered is board-specific, and controlled using the optional "rohm,ddr-backup-power" DT property. In the absence of this property, backup mode is not available. Backup mode can be enabled or disabled by the user using the standard "wakeup" virtual file in sysfs, e.g. to enable: echo enabled > /sys/devices/platform/soc/e60b0000.i2c/i2c-7/7-0030/bd9571mwv-regulator.2.auto/power/wakeup When the PMIC is configured for backup mode, the role of the accessory power switch changes from a power switch to a wake-up switch. Two types of switches (or signals) can be used: A. With a momentary power switch (or pulse signal), the PMIC is configured for backup mode in the PMIC driver's suspend callback, during system suspend. Backup mode is enabled by default, as there is no further impact during normal system operation. B. With a toggle power switch (or level signal), the following steps must be followed exactly: 1. Configure PMIC for backup mode, 2. Switch accessory power switch off, to prepare for system suspend, which is a manual step not controlled by software, 3. Suspend system. This mode is not yet supported by the driver. As the switch type is board-specific, and cannot be determined automatically, it is obtained from the presence of one of the "rohm,rstbmode-*" properties in DT. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Acked-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-06-06regulator: bd9571mwv: Statize local symbolsAxel Lin1-6/+6
These functions are only used by this driver, make them static. Signed-off-by: Axel Lin <axel.lin@ingics.com> Acked-by: Marek Vasut <marek.vasut@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-04-25regulator: Add ROHM BD9571MWV-M PMIC regulator driverMarek Vasut1-0/+178
Add driver for the regulator block in the ROHM BD9571MWV-W MFD PMIC. This block supports three voltage monitors, VD18, VD25, VD33 for the 1V8, 2V5, 3V3 voltage rails and a single voltage regulator for the DVFS rail. Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>