On SAMA5D2 SoC the PIOBU pins do not lose their voltage during Backup/Self-refresh mode. This can be useful, for example, when the voltage must remain positive for a peripheral during Backup/Self-refresh mode (suspend-to ram is the Linux equivalent state). v2: - make driver be a subnode of the syscon node - change Kconfig to depend on MFD_SYSCON and select GPIO_SYSCON - change include header from linux/gpio.h to linux/gpio/driver.h - include linux/bits.h header - change intrusion in comment to tamper - fix kerneldoc of functions - replace GPIOF_DIR_* flags with 0/1 - replace ?: statement with if-else - remove the use of sama5d2_piobu_template_chip - retrieve syscon via syscon_node_to_regmap(pdev->dev.parent->of_node); Note that PIOBU_REG_SIZE is used to determine the register to write to with regmap: reg = PIOBU_BASE + pin * PIOBU_REG_SIZE; Also, no irq capability implemented. Andrei Stefanescu (2): dt-bindings: gpio: add SAMA5D2 PIOBU support gpio: add driver for SAMA5D2 PIOBU pins .../bindings/gpio/gpio-sama5d2-piobu.txt | 31 +++ MAINTAINERS | 7 + drivers/gpio/Kconfig | 11 + drivers/gpio/Makefile | 1 + drivers/gpio/gpio-sama5d2-piobu.c | 253 +++++++++++++++++++++ 5 files changed, 303 insertions(+) create mode 100644 Documentation/devicetree/bindings/gpio/gpio-sama5d2-piobu.txt create mode 100644 drivers/gpio/gpio-sama5d2-piobu.c -- 2.7.4
