16 Jan, 2015
3 commits
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GPIO is widely used as the reset control for various devices. Let's
build the support in by default.[shawn.guo: cherry-pick commit 795fcb3bc5bb from imx_3.10.y]
Signed-off-by: Shawn Guo -
It's a little bit late to register gpio-reset driver at module_init
time, because gpio-reset provides reset control via gpio for other
devices which are mostly probed at module_init time too. And it
becomes even worse, when the gpio comes from IO expander on I2C bus,
e.g. pca953x. In that case, gpio-reset needs to be ready before I2C
bus driver which is generally ready at subsys_initcall time. Let's
register gpio-reset driver in arch_initcall() to have it ready early
enough.The defer probe mechanism is not used here, because a reset controller
driver should be reasonably registered early than other devices. More
importantly, defer probe doe not help in some nasty cases, e.g. the
gpio-pca953x device itself needs a reset from gpio-reset driver start
working.[shawn.guo: cherry-pick commit 7153f05108ef from imx_3.10.y]
Signed-off-by: Shawn Guo -
This driver implements a reset controller device that toggle a gpio
connected to a reset pin of a peripheral IC. The delay between assertion
and de-assertion of the reset signal can be configured via device tree.Signed-off-by: Philipp Zabel
Reviewed-by: Stephen Warren
Reviewed-by: Pavel Machek
[shawn.guo: cherry-pick commit 27e3604c82cb from imx_3.10.y]
Signed-off-by: Shawn GuoConflicts:
drivers/reset/Makefile
23 Nov, 2013
1 commit
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The Allwinner A31 and most of the other Allwinner SoCs have an IP
maintaining a few other IPs in the SoC in reset by default. Among these
IPs are the A31's High Speed Timers, hence why we can't use the regular
driver construct in every cases, and need to call the registering
function directly during machine initialisation.Apart from this, the implementation is fairly straightforward, and could
easily be moved to a generic MMIO-based reset controller driver if the
need ever arise.Signed-off-by: Maxime Ripard
Acked-by: Philipp Zabel
12 Apr, 2013
2 commits
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"rstc" is NULL here and we should use "rcdev" instead of "rstc->rcdev".
Signed-off-by: Dan Carpenter
Signed-off-by: Philipp Zabel -
This adds a simple API for devices to request being reset
by separate reset controller hardware and implements the
reset signal device tree binding.Signed-off-by: Philipp Zabel
Reviewed-by: Stephen Warren
Reviewed-by: Shawn Guo
Reviewed-by: Marek Vasut
Reviewed-by: Pavel Machek
