The OPP core currently requires the required opp tables to be available
before the dependent OPP table is added, as it needs to create links
from the dependent OPP table to the required ones. This may not be
convenient for all the platforms though, as this requires strict
ordering for probing the drivers.

This patch allows lazy-linking of the required-opps. The OPP tables for
which the required-opp-tables aren't available at the time of their
initialization, are added to a special list of OPP tables:
lazy_opp_tables. Later on, whenever a new OPP table is registered with
the OPP core, we check if it is required by an OPP table in the pending
list; if yes, then we complete the linking then and there.

An OPP table is marked unusable until the time all its required-opp
tables are available. And if lazy-linking fails for an OPP table, the
OPP core disables all of its OPPs to make sure no one can use them.
Tested-by: Hsin-Yi Wang <hsinyi@chromium.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

All the users have migrated to dev_pm_opp_set_opp() now, get rid of the
duplicate API, dev_pm_opp_set_bw(), which only performs a part of the new API.

While at it, remove the unnecessary parameter to _set_opp_bw().
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Tested-by: Dmitry Osipenko <digetx@gmail.com>

dev_pm_opp_set_bw() is getting removed and dev_pm_opp_set_opp() should
be used instead. Migrate to the new API.

We don't want the OPP core to manage the clk for this driver, migrate to
dev_pm_opp_of_add_table_noclk() to make sure dev_pm_opp_set_opp()
doesn't have any side effects.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Tested-by: Dmitry Osipenko <digetx@gmail.com>

dev_pm_opp_set_bw() is getting removed and dev_pm_opp_set_opp() should
be used instead. Migrate to the new API.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

dev_pm_opp_set_bw() is getting removed and dev_pm_opp_set_opp() should
be used instead. Migrate to the new API.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Tested-by: Dmitry Osipenko <digetx@gmail.com>

The new helper dev_pm_opp_set_opp() can be used for configuring the
devices for a particular OPP and can be used by different type of
devices, even the ones which don't change frequency (like power
domains).
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Tested-by: Dmitry Osipenko <digetx@gmail.com>

Drop the unnecessary parameters and follow the pattern from
_generic_set_opp_regulator().

While at it, also remove the local variable old_freq.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Tested-by: Dmitry Osipenko <digetx@gmail.com>

In order to avoid conditional statements at the caller site, this patch
updates _generic_set_opp_clk_only() to work for devices that don't
change frequency (like power domains, etc.). Return 0 if the clk pointer
passed to this routine is not valid.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Tested-by: Dmitry Osipenko <digetx@gmail.com>

The _generic_set_opp_regulator() helper will be used for devices which
don't change frequency (like power domains, etc.) later on, prepare for
that by not relying on frequency for making decisions here.

While at it, update its parameters to pass only what is necessary.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Tested-by: Dmitry Osipenko <digetx@gmail.com>

The _set_opp() helper will be used for devices which don't change frequency
(like power domains, etc.) later on, prepare for that by not relying on
frequency for making decisions here.

While at it, also update the debug print to contain all relevant
information.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Tested-by: Dmitry Osipenko <digetx@gmail.com>

The _set_opp() helper will be used for devices which don't change their
frequency (like power domains, etc.) later on, prepare for that by
breaking the generic part out of dev_pm_opp_set_rate().
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Tested-by: Dmitry Osipenko <digetx@gmail.com>

The dev_pm_opp_set_rate() helper needs to know the currently programmed
OPP to make few decisions and currently we try to find it on every
invocation of this routine.

Lets start keeping track of the current_opp programmed for the devices
of the opp table, that will be quite useful going forward.

If we fail to find the current OPP, we pick the first one available in
the list, as the list is in ascending order of frequencies, level, or
bandwidth and that's the best guess we can make anyway.

Note that we used to do the frequency comparison a bit early in
dev_pm_opp_set_rate() previously, and now instead we check the target
opp, which shall be more accurate anyway.

We need to make sure that current_opp's memory doesn't get freed while
it is being used and so we keep a reference of it until the time it is
used.

Now that current_opp will always be set, we can drop some unnecessary
checks as well.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Tested-by: Dmitry Osipenko <digetx@gmail.com>

Clock is not optional for users who call into dev_pm_opp_set_rate().
Remove the unnecessary checks.

While at it also drop the local variable for clk and use opp_table->clk
instead.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Tested-by: Dmitry Osipenko <digetx@gmail.com>

This routine has nothing to do with frequency, it just disables all the
resources previously enabled. Rename it to match its purpose.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Tested-by: Dmitry Osipenko <digetx@gmail.com>

Check whether OPP table has regulators in _set_opp_custom() and set up
dev_pm_set_opp_data accordingly. Now _set_opp_custom() works properly,
i.e. it doesn't crash if OPP table doesn't have assigned regulators.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
[ Viresh: Rearrange the routine a bit ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

Until now the ->set_opp() helper (i.e. special implementation for
setting the OPPs for platforms) was implemented only to take care of
multiple regulators case, but going forward we would need that for other
use cases as well.

This patch prepares for that by allocating the regulator specific part
from dev_pm_opp_set_regulators() and the opp helper part from
dev_pm_opp_register_set_opp_helper().
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Tested-by: Dmitry Osipenko <digetx@gmail.com>

Print OPP level in debug message of _opp_add_static_v2(). This helps to
chase GENPD bugs.
Tested-by: Peter Geis <pgwipeout@gmail.com>
Tested-by: Nicolas Chauvet <kwizart@gmail.com>
Tested-by: Matt Merhar <mattmerhar@protonmail.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

NVIDIA Tegra SoCs have a power domains topology such that child domains
only clamp a power rail, while parent domain controls shared performance
state of the multiple child domains. In this case child's domain doesn't
need to have OPP table. Hence we want to allow children power domains to
pass performance state to the parent domain if child's domain doesn't have
OPP table.

The dev_pm_opp_xlate_performance_state() gets src_table=NULL if a child
power domain doesn't have OPP table and in this case we should pass the
performance state to the parent domain.
Tested-by: Peter Geis <pgwipeout@gmail.com>
Tested-by: Nicolas Chauvet <kwizart@gmail.com>
Tested-by: Matt Merhar <mattmerhar@protonmail.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

Add resource-managed version of dev_pm_opp_attach_genpd().
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
[ Viresh: Manually apply the patch and relocate the routines ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

Add resource-managed version of dev_pm_opp_register_set_opp_helper().
Tested-by: Peter Geis <pgwipeout@gmail.com>
Tested-by: Nicolas Chauvet <kwizart@gmail.com>
Tested-by: Matt Merhar <mattmerhar@protonmail.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
[ Viresh: Manually apply the patch and relocate the routines ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

A few drivers have device's clk but they don't want the OPP core to
handle that. Add a new helper for them, dev_pm_opp_of_add_table_noclk().
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Tested-by: Dmitry Osipenko <digetx@gmail.com>

We acquire the clk at the time the OPP table is allocated, though it
works fine, it is not the best place to do so. One of the main reason
being we may need to acquire it again from dev_pm_opp_set_clkname() if
the platform wants another clock to be acquired instead.

There is also requirement from some of the platforms where they do not
want the OPP core to manage the clock at all.

This patch hence defers acquiring the clk until the time we are certain
about which clk we need to acquire and if we really need to acquire one.
With this commit, the clk will get acquired either from
dev_pm_opp_set_clkname() or while we initialize the OPPs within the
table.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Tested-by: Dmitry Osipenko <digetx@gmail.com>

The implementation of dev_pm_opp_of_add_table() and
dev_pm_opp_of_add_table_indexed() are almost identical. Create
_of_add_table_indexed() to reduce code redundancy.

Also remove the duplication of the doc style comments by referring to
dev_pm_opp_of_add_table() from dev_pm_opp_of_add_table_indexed().
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Tested-by: Dmitry Osipenko <digetx@gmail.com>

Extend OPP API with dev_pm_opp_sync_regulators() function, which syncs
voltage state of regulators.
Tested-by: Peter Geis <pgwipeout@gmail.com>
Tested-by: Nicolas Chauvet <kwizart@gmail.com>
Tested-by: Matt Merhar <mattmerhar@protonmail.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
[ Viresh: Added unlikely() ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

Add dev_pm_opp_get_required_pstate() which allows OPP users to retrieve
required performance state of a given OPP.
Tested-by: Peter Geis <pgwipeout@gmail.com>
Tested-by: Nicolas Chauvet <kwizart@gmail.com>
Tested-by: Matt Merhar <mattmerhar@protonmail.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

Add a ceil version of the dev_pm_opp_find_level(). It's handy to have if
levels don't start from 0 in OPP table and zero usually means a minimal
level.
Tested-by: Peter Geis <pgwipeout@gmail.com>
Tested-by: Nicolas Chauvet <kwizart@gmail.com>
Tested-by: Matt Merhar <mattmerhar@protonmail.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

_add_opp_table() isn't used outside of core.c, mark it static.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

The debug message always prints rate=0 instead of a proper value, fix it.

Fixes: 6c591eec ("OPP: Add helpers for reading the binding properties")
Tested-by: Peter Geis <pgwipeout@gmail.com>
Tested-by: Nicolas Chauvet <kwizart@gmail.com>
Tested-by: Matt Merhar <mattmerhar@protonmail.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
[ Viresh: Added Fixes tag ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

A required OPP may not be available, and thus, all OPPs which are using
this required OPP should be unavailable too.
Tested-by: Peter Geis <pgwipeout@gmail.com>
Tested-by: Nicolas Chauvet <kwizart@gmail.com>
Tested-by: Matt Merhar <mattmerhar@protonmail.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

Fix adding OPP entries in a wrong (opposite) order if OPP rate is
unavailable. The OPP comparison was erroneously skipped, thus OPPs
were left unsorted.
Tested-by: Peter Geis <pgwipeout@gmail.com>
Tested-by: Nicolas Chauvet <kwizart@gmail.com>
Tested-by: Matt Merhar <mattmerhar@protonmail.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

Pull EFI fix from Borislav Petkov:
 "A single fix from Lukas: handle boolean device properties imported
  from Apple firmware correctly"

* tag 'efi-urgent-for-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  efi/apple-properties: Reinstate support for boolean properties

Pull x86 fix from Borislav Petkov:
 "A single fix for objtool to generate proper unwind info for newer
  toolchains which do not generate section symbols anymore. And a
  cleanup ontop.

  This was originally going to go during the next merge window but
  people can already trigger a build error with binutils-2.36 which
  doesn't emit section symbols - something which objtool relies on - so
  let's expedite it"

* tag 'x86_entry_for_v5.11_rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/entry: Remove put_ret_addr_in_rdi THUNK macro argument
  x86/entry: Emit a symbol for register restoring thunk

Pull timer fix from Thomas Gleixner:
 "A fix for handling advertised, but non-existent 146818 RTCs correctly.

  With the recent UIP handling changes the time readout of non-existent
  RTCs hangs forever as the read returns always 0xFF which means the UIP
  bit is set.

  Sanity check the RTC before registering by checking the RTC_VALID
  register for correctness"

* tag 'timers-urgent-2021-01-31' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  rtc: mc146818: Detect and handle broken RTCs

Pull single stepping fix from Thomas Gleixner:
 "A single fix for the single step reporting regression caused by
  getting the condition wrong when moving SYSCALL_EMU away from TIF
  flags"

[ There's apparently another problem too, fix pending ]

* tag 'core-urgent-2021-01-31' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  entry: Unbreak single step reporting behaviour

Pull powerpc fix from Michael Ellerman:
 "One fix for a bug in our soft interrupt masking, which could lead to
  interrupt replaying recursing, causing spurious interrupts.

  Thanks to Nicholas Piggin"

* tag 'powerpc-5.11-6' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/64s: prevent recursive replay_soft_interrupts causing superfluous interrupt

Pull i2c fix from Wolfram Sang:
 "Just one I2C driver update this time"

* 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
  i2c: mediatek: Move suspend and resume handling to NOIRQ phase

Pull LED fixes from Pavel Machek:
 "This pull is due to 'leds: trigger: fix potential deadlock with
  libata' -- people find the warn annoying.

  It also contains new driver and two trivial fixes"

* 'for-rc-5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/pavel/linux-leds:
  leds: rt8515: Add Richtek RT8515 LED driver
  dt-bindings: leds: Add DT binding for Richtek RT8515
  leds: trigger: fix potential deadlock with libata
  leds: leds-ariel: convert comma to semicolon
  leds: leds-lm3533: convert comma to semicolon

Pull NFS client fixes from Trond Myklebust:

 - SUNRPC: Handle 0 length opaque XDR object data properly

 - Fix a layout segment leak in pnfs_layout_process()

 - pNFS/NFSv4: Update the layout barrier when we schedule a layoutreturn

 - pNFS/NFSv4: Improve rejection of out-of-order layouts

 - pNFS/NFSv4: Try to return invalid layout in pnfs_layout_process()

* tag 'nfs-for-5.11-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
  SUNRPC: Handle 0 length opaque XDR object data properly
  SUNRPC: Move simple_get_bytes and simple_get_netobj into private header
  pNFS/NFSv4: Improve rejection of out-of-order layouts
  pNFS/NFSv4: Update the layout barrier when we schedule a layoutreturn
  pNFS/NFSv4: Try to return invalid layout in pnfs_layout_process()
  pNFS/NFSv4: Fix a layout segment leak in pnfs_layout_process()

This adds a driver for the Richtek RT8515 dual channel
torch/flash white LED driver.

This LED driver is found in some mobile phones from
Samsung such as the GT-S7710 and GT-I8190.

A V4L interface is added.

We do not have a proper datasheet for the RT8515 but
it turns out that RT9387A has a public datasheet and
is essentially the same chip. We designed the driver
in accordance with this datasheet. The day someone
needs to drive a RT9387A this driver can probably
easily be augmented to handle that chip too.

Sakari Ailus, Pavel Machek and Andy Shevchenko helped
significantly in getting this driver right.

Cc: Sakari Ailus <sakari.ailus@iki.fi>
Cc: newbytee@protonmail.com
Cc: Stephan Gerhold <stephan@gerhold.net>
Cc: linux-media@vger.kernel.org
Cc: phone-devel@vger.kernel.org
Reviewed-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Pavel Machek <pavel@ucw.cz>