linux/arch/arm/mach-ixp4xx
Linus Walleij e0fc62a655 w1: w1-gpio: Convert to use GPIO descriptors
The w1 master driver includes a complete open drain emulation
reimplementation among other things.

This converts the driver and all board files using it to use
GPIO descriptors associated with the device to look up the
GPIO wire, as well ass the optional pull-up GPIO line.

When probed from the device tree, the driver will just pick
descriptors and use them right off. For the two board files
in the kernel, we add descriptor lookups so we do not need
to keep any old platform data handling around for the GPIO
lines.

As the platform data is also a state container for this driver,
we augment it to contain the GPIO descriptors.

w1_gpio_write_bit_dir() and w1_gpio_write_bit_val() are gone
since this pair was a reimplementation of open drain emulation
which is now handled by gpiolib.

The special "linux,open-drain" flag is a bit of mishap here:
it has the same semantic as the same flags in I2C: it means
that something in the platform is setting up the line as
open drain behind our back. We handle this the same way as
in I2C.

To drive the pull-up, we need to bypass open drain emulation
in gpiolib for the line, and this is done by driving it high
using gpiod_set_raw_value() which has been augmented to have
the semantic of overriding the open drain emulation.

We also augment the documentation to reflect the way to pass
GPIO descriptors from the machine.

Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-12-08 15:32:53 +01:00
..
include/mach License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
avila-pci.c ARM: PCI: provide a default bus scan implementation 2012-05-13 17:12:17 +01:00
avila-setup.c Merge branch 'i2c/for-4.15' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2017-11-14 17:52:21 -08:00
common-pci.c scripts/spelling.txt: add regsiter -> register spelling mistake 2017-05-08 17:15:13 -07:00
common.c clocksource: Use a plain u64 instead of cycle_t 2016-12-25 11:04:12 +01:00
coyote-pci.c ARM: PCI: provide a default bus scan implementation 2012-05-13 17:12:17 +01:00
coyote-setup.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
dsmg600-pci.c ARM: PCI: provide a default bus scan implementation 2012-05-13 17:12:17 +01:00
dsmg600-setup.c treewide: Switch DEFINE_TIMER callbacks to struct timer_list * 2017-11-21 15:57:05 -08:00
fsg-pci.c ARM: PCI: provide a default bus scan implementation 2012-05-13 17:12:17 +01:00
fsg-setup.c Merge branch 'i2c/for-4.15' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2017-11-14 17:52:21 -08:00
gateway7001-pci.c ARM: PCI: provide a default bus scan implementation 2012-05-13 17:12:17 +01:00
gateway7001-setup.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
goramo_mlr.c Merge branch 'i2c/for-4.15' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2017-11-14 17:52:21 -08:00
gtwx5715-pci.c ARM: PCI: provide a default bus scan implementation 2012-05-13 17:12:17 +01:00
gtwx5715-setup.c ARM: delete struct sys_timer 2012-12-24 09:36:38 -07:00
ixdp425-pci.c ARM: PCI: provide a default bus scan implementation 2012-05-13 17:12:17 +01:00
ixdp425-setup.c Merge branch 'i2c/for-4.15' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2017-11-14 17:52:21 -08:00
ixdpg425-pci.c ARM: PCI: provide a default bus scan implementation 2012-05-13 17:12:17 +01:00
ixp4xx_npe.c ixp4xx: Declare MODULE_FIRMWARE usage 2012-11-22 03:36:22 +00:00
ixp4xx_qmgr.c IXP4xx: use __iomem for MMIO 2012-11-22 03:36:45 +00:00
Kconfig ARM: fix ARCH_IXP4xx usage of ARCH_SUPPORTS_BIG_ENDIAN 2013-10-19 20:46:32 +01:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Makefile.boot ARM: 7022/1: allow to detect conflicting zreladdrs 2011-10-17 09:12:40 +01:00
miccpt-pci.c ARM: PCI: provide a default bus scan implementation 2012-05-13 17:12:17 +01:00
nas100d-pci.c ARM: PCI: provide a default bus scan implementation 2012-05-13 17:12:17 +01:00
nas100d-setup.c treewide: Switch DEFINE_TIMER callbacks to struct timer_list * 2017-11-21 15:57:05 -08:00
nslu2-pci.c ARM: PCI: provide a default bus scan implementation 2012-05-13 17:12:17 +01:00
nslu2-setup.c Merge branch 'i2c/for-4.15' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2017-11-14 17:52:21 -08:00
omixp-setup.c ARM: ixp4xx/omixp: always include linux/leds.h 2014-03-21 18:23:25 +01:00
vulcan-pci.c ARM: PCI: provide a default bus scan implementation 2012-05-13 17:12:17 +01:00
vulcan-setup.c w1: w1-gpio: Convert to use GPIO descriptors 2017-12-08 15:32:53 +01:00
wg302v2-pci.c ARM: PCI: provide a default bus scan implementation 2012-05-13 17:12:17 +01:00
wg302v2-setup.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00