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[v2,0/2] add SAMA5D2 PIOBU GPIO driver

Message ID 1542701330-23466-1-git-send-email-andrei.stefanescu@microchip.com
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Series add SAMA5D2 PIOBU GPIO driver | expand

Message

Andrei.Stefanescu@microchip.com Nov. 20, 2018, 8:08 a.m. UTC 
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

Comments

Linus Walleij Nov. 20, 2018, 10:02 a.m. UTC | #1 
Hi Andrei,

On Tue, Nov 20, 2018 at 9:08 AM <Andrei.Stefanescu@microchip.com> wrote:

> 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:

This version looks good to me, I'm just waiting for a DT
binding review.

Yours,
Linus Walleij