Add a reset-controller driver for performing reset management of
various devices present on the SoC, with the reset registers shared
between devices in a common register memory space. This driver uses
the syscon/regmap frameworks to actually implement the various reset
functionalities needed by the reset consumer devices.
Signed-off-by: NAndrew F. Davis <afd@ti.com>
[s-anna@ti.com: add documentation, syscon name change]
Signed-off-by: NSuman Anna <s-anna@ti.com>
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>

Add hi6220 media subsystem reset controller.
Signed-off-by: NChen Feng <puck.chen@hisilicon.com>
Signed-off-by: NXia Qing <saberlily.xia@hisilicon.com>
Signed-off-by: NXinliang Liu <xinliang.liu@linaro.org>
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>

There are two reset controllers in hi6220 SoC:
The peripheral reset controller bits are part of sysctrl registers.
The media reset controller bits are part of mediactrl registers.

So change register access to syscon way.
And rename current reset controller to peripheral one.
Signed-off-by: NChen Feng <puck.chen@hisilicon.com>
Signed-off-by: NXia Qing <saberlily.xia@hisilicon.com>
Signed-off-by: NXinliang Liu <xinliang.liu@linaro.org>
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>

This patch adds the platform driver for the Amlogic Meson SoC Reset
Controller.

The Meson8b and GXBB SoCs are supported.
Signed-off-by: NNeil Armstrong <narmstrong@baylibre.com>
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>

Use the brand new devm_reset_controller_register() API to get rid of
the platform driver remove callback.
Signed-off-by: NNeil Armstrong <narmstrong@baylibre.com>
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>

In "make menuconfig", reset drivers are currently lined up together
with the reset sub-system menu, like this:

    -*- Reset Controller Support  ----
    < > Hi6220 Reset Driver

(It also means, the menu "Reset Controller Support" is always empty.)

"Hi6220 Reset Driver" should go into the sub-menu of the
"Reset Controller Support".
Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>

Use devm_reset_controller_register() for the reset controller
registration and drop the .remove callback.
Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>

Use devm_reset_controller_register() for the reset controller
registration and drop the .remove callback.
Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>

Use devm_reset_controller_register() for the reset controller
registration and drop the .remove callback.
Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>

Use devm_reset_controller_register() for the reset controller
registration and drop the .remove callback.
Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>

Use devm_reset_controller_register() for the reset controller
registration and remove the unregister call from the .remove callback.
Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>

Add a device managed API for reset_controller_register().

This helps in reducing code in .remove callbacks and sometimes
dropping .remove callbacks entirely.
Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: NLaxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>

Add System reset controller driver for Oxford Semiconductor OXNAS SoC
Family.

CC: Ma Haijun <mahaijuns@gmail.com>
Signed-off-by: NNeil Armstrong <narmstrong@baylibre.com>
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>

Moving the notifier_block into the drivers priv struct allows us
to retrive the priv struct with container_of and remove the
global variables.
Signed-off-by: NJoachim Eastwood <manabian@gmail.com>
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>

In some SoCs some hw-blocks share a reset control. Add support for this
setup by adding new:

reset_control_get_shared()
devm_reset_control_get_shared()
devm_reset_control_get_shared_by_index()

methods to get a reset_control. Note that this patch omits adding of_
variants, if these are needed later they can be easily added.

This patch also changes the behavior of the existing exclusive
reset_control_get() variants, if these are now called more then once
for the same reset_control they will return -EBUSY. To catch existing
drivers triggering this error (there should not be any) a WARN_ON(1)
is added in this path.

When a reset_control is shared, the behavior of reset_control_assert /
deassert is changed, for shared reset_controls these will work like the
clock-enable/disable and regulator-on/off functions. They will keep a
deassert_count, and only (re-)assert the reset after reset_control_assert
has been called as many times as reset_control_deassert was called.

Calling reset_control_assert without first calling reset_control_deassert
is not allowed on a shared reset control. Calling reset_control_reset is
also not allowed on a shared reset control.
Signed-off-by: NHans de Goede <hdegoede@redhat.com>
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>

Now that struct reset_control no longer stores the device pointer for
the device calling reset_control_get we can share a single struct
reset_control when multiple calls to reset_control_get are made for
the same reset line (same id / index).

This is a preparation patch for adding support for shared reset lines.
Signed-off-by: NHans de Goede <hdegoede@redhat.com>
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>

With both the regular, _by_index and _optional variants we already have
quite a few variants of [of_]reset_control_get[_foo], the upcoming
addition of shared reset lines support makes this worse.

This commit changes all the variants into wrappers around common core
functions. For completeness sake this commit also adds a new
devm_get_reset_control_by_index wrapper.
Signed-off-by: NHans de Goede <hdegoede@redhat.com>
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>

The syscfg_reset_ops structure is never modified. Make it const.
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>

The zynq_reset_ops structure is never modified. Make it const.
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>

The socfpga_reset_ops structure is never modified. Make it const.
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>

The hi6220_reset_ops structure is never modified. Make it const.
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>

The ath79_reset_ops structure is never modified. Make it const.
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>
Acked-by: NAlban Bedel <albeu@free.fr>

The lpc18xx_rgu_ops structure is never modified. Make it const.
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>
Acked-by: NJoachim Eastwood <manabian@gmail.com>

The sunxi_reset_ops structure is never modified. Make it const.
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>
Acked-by: NMaxime Ripard <maxime.ripard@free-electrons.com>

The pistachio_reset_ops structure is never modified. Make it const.
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>
Acked-by: NJames Hartley <james.hartley@imgtec.com>

The berlin_reset_ops structure is never modified. Make it const.
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>
Acked-by: NAntoine Tenart <antoine.tenart@free-electrons.com>

Now that the DT cell size check has been moved to the core,
there is no need to check again.
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>

Add reset controller driver for Pistachio SoC
Signed-off-by: NDamien Horsley <Damien.Horsley@imgtec.com>
Signed-off-by: NJames Hartley <james.hartley@imgtec.com>
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>

The newly added hisilicon reset driver missed the subsystem-wide
fixup by commit d1f15aa0 ("reset: check return value of
reset_controller_register()").  So fix it now.
Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>

The core currently doesn't check that the DT cell size matches what the
driver declares, which means that every xlate function needs to duplicate
that check.

Make sure that of_reset_control_get checks for this to avoid duplication
and errors.
Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>

There is no need to initialize rstc, as it is unconditionally
assigned the return value of a kzalloc call before use.
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>

We need to include <linux/module.h> to build the driver as a loadable
module:

drivers/reset/hisilicon/hi6220_reset.c:108:1: warning: data definition has no type or storage class
 postcore_initcall(hi6220_reset_init);
Signed-off-by: NArnd Bergmann <arnd@arndb.de>

Add a system restart handler that use the FULL_CHIP_RESET bit of the
reset controller.
Signed-off-by: NAlban Bedel <albeu@free.fr>
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>

Add reset driver for hi6220-hikey board,this driver supply deassert
of IP on hi6220 SoC.
Signed-off-by: NChen Feng <puck.chen@hisilicon.com>
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>

Commit 0c5b2b91 ("reset: Mark function as static and remove unused
function in core.c") removed the only user of the device pointer in
struct reset_control. As it is now unused, remove it.
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>

Currently, reset_controller_register() always return 0, but it would
be better to check its return code.
Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: NSören Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>

The directory drivers/reset/ is guarded by CONFIG_RESET_CONTROLLER
in driver/Makefile.

CONFIG_RESET_CONTROLLER is boolean, so it always evaluates to 'y'
in drivers/reset/Makefile.
Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>

ENOSYS is reserved to report invalid syscalls to userspace.
Consistently return ENOTSUPP to indicate that the driver doesn't support
the functionality or the reset framework is not enabled at all.
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>

Since this array is static const, it should be marked as __initconst.
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>
Acked-by: NMaxime Ripard <maxime.ripard@free-electrons.com>

This just fixes a checkpatch warning, no functional change.
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>
Acked-by: NMaxime Coquelin <maxime.coquelin@st.com>