linux-kernel - [PATCH v3 0/2] add SAMA5D2 PIOBU GPIO driver

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Date:   Fri, 7 Dec 2018 06:46:24 +0000
From:   <Andrei.Stefanescu@...rochip.com>
To:     <linus.walleij@...aro.org>, <gregkh@...uxfoundation.org>,
        <Nicolas.Ferre@...rochip.com>, <robh+dt@...nel.org>,
        <mark.rutland@....com>
CC:     <Ludovic.Desroches@...rochip.com>, <Cristian.Birsan@...rochip.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-gpio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <Andrei.Stefanescu@...rochip.com>
Subject: [PATCH v3 0/2] add SAMA5D2 PIOBU GPIO driver

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).

v3:
- change driver's compatible to atmel,sama5d2-secumod
- get syscon using syscon_node_to_regmap(pdev->dev.of_node)
- document how to use SECUMOD as a gpio-controller

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: arm: atmel: describe SECUMOD usage as a GPIO controller
  gpio: add driver for SAMA5D2 PIOBU pins

 .../devicetree/bindings/arm/atmel-sysregs.txt      |  12 +-
 MAINTAINERS                                        |   6 +
 drivers/gpio/gpio-sama5d2-piobu.c                  | 253 +++++++++++++++++++++
 3 files changed, 270 insertions(+), 1 deletion(-)
 create mode 100644 drivers/gpio/gpio-sama5d2-piobu.c

-- 
2.7.4