| From: |
| <Andrei.Stefanescu-AT-microchip.com> |
| To: |
| <linus.walleij-AT-linaro.org>, <gregkh-AT-linuxfoundation.org>, <Nicolas.Ferre-AT-microchip.com>, <robh+dt-AT-kernel.org>, <mark.rutland-AT-arm.com> |
| Subject: |
| [PATCH v2 0/2] add SAMA5D2 PIOBU GPIO driver |
| Date: |
| Tue, 20 Nov 2018 08:08:33 +0000 |
| Message-ID: |
| <1542701330-23466-1-git-send-email-andrei.stefanescu@microchip.com> |
| Cc: |
| <Ludovic.Desroches-AT-microchip.com>, <Cristian.Birsan-AT-microchip.com>, <linux-arm-kernel-AT-lists.infradead.org>, <linux-gpio-AT-vger.kernel.org>, <linux-kernel-AT-vger.kernel.org>, <devicetree-AT-vger.kernel.org>, <Andrei.Stefanescu-AT-microchip.com> |
| Archive-link: |
| Article |
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