15 Aug, 2016
1 commit
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Commit 'b09d6d991' removes include/linux/clk-private.h and
re-arranges the clock related structures contained in it in
different files. The documentation has not been updated
accordingly, thus it wasn't anymore consistent.Place the structures referenced by Documentation/clk.txt in the
correct files and update their contents to the latest status.Signed-off-by: Andi Shyti
[geert: Fix path to clk.c, whitespace, more clk_core, ...]
Signed-off-by: Geert Uytterhoeven
Signed-off-by: Jonathan Corbet
28 Jul, 2015
1 commit
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Clock rates are stored in an unsigned long field, but ->determine_rate()
(which returns a rounded rate from a requested one) returns a long
value (errors are reported using negative error codes), which can lead
to long overflow if the clock rate exceed 2Ghz.Change ->determine_rate() prototype to return 0 or an error code, and pass
a pointer to a clk_rate_request structure containing the expected target
rate and the rate constraints imposed by clk users.The clk_rate_request structure might be extended in the future to contain
other kind of constraints like the rounding policy, the maximum clock
inaccuracy or other things that are not yet supported by the CCF
(power consumption constraints ?).Signed-off-by: Boris Brezillon
CC: Jonathan Corbet
CC: Tony Lindgren
CC: Ralf Baechle
CC: "Emilio López"
CC: Maxime Ripard
Acked-by: Tero Kristo
CC: Peter De Schrijver
CC: Prashant Gaikwad
CC: Stephen Warren
CC: Thierry Reding
CC: Alexandre Courbot
CC: linux-doc@vger.kernel.org
CC: linux-kernel@vger.kernel.org
CC: linux-arm-kernel@lists.infradead.org
CC: linux-omap@vger.kernel.org
CC: linux-mips@linux-mips.org
CC: linux-tegra@vger.kernel.org
[sboyd@codeaurora.org: Fix parent dereference problem in
__clk_determine_rate()]
Signed-off-by: Stephen Boyd
Tested-by: Romain Perier
Signed-off-by: Heiko Stuebner
[sboyd@codeaurora.org: Folded in fix from Heiko for fixed-rate
clocks without parents or a rate determining op]
Signed-off-by: Stephen Boyd
14 May, 2015
1 commit
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Currently Documentation/clk.txt describes an obsolete techinique to
statically define struct clk objects.This capability was removed by b09d6d991025("clk: remove clk-private.h")
and is no longer supported. The documentation describing the feature should
be removed.Signed-off-by: Daniel Thompson
Cc: Jonathan Corbet
Cc: Michael Turquette
Cc: Stephen Boyd
Signed-off-by: Stephen Boyd
03 Feb, 2015
1 commit
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Adds a way for clock consumers to set maximum and minimum rates. This
can be used for thermal drivers to set minimum rates, or by misc.
drivers to set maximum rates to assure a minimum performance level.Changes the signature of the determine_rate callback by adding the
parameters min_rate and max_rate.Signed-off-by: Tomeu Vizoso
Signed-off-by: Stephen Boyd
[sboyd@codeaurora.org: set req_rate in __clk_init]
Signed-off-by: Michael Turquette
[mturquette@linaro.org: min/max rate for sun6i_ahb1_clk_determine_rate
migrated clk-private.h changes to clk.c]
04 Dec, 2014
1 commit
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This is in preparation for clock providers to not have to deal with struct clk.
Signed-off-by: Tomeu Vizoso
Reviewed-by: Stephen Boyd
Signed-off-by: Michael Turquette
13 May, 2014
1 commit
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General:
- Add parameter names to .round_rate() and .set_rate().Documentation/clk.txt:
- Add missing parameter for .set_rate(),
- Add missing .debug_init().include/linux/clk-provider.h:
- Add parent rate documentation for .round_rate(),
- Reorder documentation to match implementation order,
- Add missing documentation for .init().Signed-off-by: Geert Uytterhoeven
Signed-off-by: Mike Turquette
20 Mar, 2014
1 commit
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Briefly document the common clock framework locking scheme from a clock
driver point of view.Signed-off-by: Laurent Pinchart
Signed-off-by: Mike Turquette
17 Jan, 2014
1 commit
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Some of Qualcomm's clocks can change their parent and rate at the
same time with a single register write. Add support for this
hardware to the common clock framework by adding a new
set_rate_and_parent() op. When the clock framework determines
that both the parent and the rate are going to change during
clk_set_rate() it will call the .set_rate_and_parent() op if
available and fall back to calling .set_parent() followed by
.set_rate() otherwise.Reviewed-by: James Hogan
Signed-off-by: Stephen Boyd
Signed-off-by: Mike Turquette
23 Dec, 2013
1 commit
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The clock accuracy is expressed in ppb (parts per billion) and represents
the possible clock drift.
Say you have a clock (e.g. an oscillator) which provides a fixed clock of
20MHz with an accuracy of +- 20Hz. This accuracy expressed in ppb is
20Hz/20MHz = 1000 ppb (or 1 ppm).Clock users may need the clock accuracy information in order to choose
the best clock (the one with the best accuracy) across several available
clocks.This patch adds clk accuracy retrieval support for common clk framework by
means of a new function called clk_get_accuracy.
This function returns the given clock accuracy expressed in ppb.In order to get the clock accuracy, this implementation adds one callback
called recalc_accuracy to the clk_ops structure.
This callback is given the parent clock accuracy (if the clock is not a
root clock) and should recalculate the given clock accuracy.This callback is optional and may be implemented if the clock is not
a perfect clock (accuracy != 0 ppb).Signed-off-by: Boris BREZILLON
Signed-off-by: Mike Turquette
20 Aug, 2013
1 commit
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Add core support to allow clock implementations to select the best
parent clock when rounding a rate, e.g. the one which can provide the
closest clock rate to that requested. This is by way of adding a new
clock op, determine_rate(), which is like round_rate() but has an extra
parameter to allow the clock implementation to optionally select a
different parent clock. The core then takes care of reparenting the
clock when setting the rate.The parent change takes place with the help of some new private data
members. struct clk::new_parent specifies a clock's new parent (NULL
indicates no change), and struct clk::new_child specifies a clock's new
child (whose new_parent member points back to it). The purpose of these
are to allow correct walking of the future tree for notifications prior
to actually reparenting any clocks, specifically to skip child clocks
who are being reparented to another clock (they will be notified via the
new parent), and to include any new child clock. These pointers are set
by clk_calc_subtree(), and the new_child pointer gets cleared when a
child is actually reparented to avoid duplicate POST_RATE_CHANGE
notifications.Each place where round_rate() is called, determine_rate() is checked
first and called in preference. This restructures a few of the call
sites to simplify the logic into if/else blocks.Signed-off-by: James Hogan
Reviewed-by: Stephen Boyd
Cc: Mike Turquette
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Mike Turquette
11 Jun, 2013
1 commit
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Signed-off-by: Sachin Kamat
Acked-by: Rob Landley
Signed-off-by: Jiri Kosina
28 Apr, 2013
1 commit
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This is primarily useful when there's a driver that doesn't claim clocks
properly, but the bootloader leaves them on. It's not expected to be used
in normal cases, but for bringup and debug it's very useful to have the
option to not gate unclaimed clocks that are still on.Signed-off-by: Olof Johansson
Signed-off-by: Mike Turquette
[mturquette@linaro.org: fixed up trivial merge issue]
22 Mar, 2013
1 commit
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Correcting misspelling inside the clk.txt.
Signed-off-by: Eduardo Valentin
Signed-off-by: Mike Turquette
17 Mar, 2012
1 commit
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Provide documentation for the common clk structures and APIs. This code
can be found in drivers/clk/ and include/linux/clk*.h.Signed-off-by: Mike Turquette
Signed-off-by: Mike Turquette
Reviewed-by: Andrew Lunn
Cc: Russell King
Cc: Jeremy Kerr
Cc: Thomas Gleixner
Cc: Arnd Bergman
Cc: Paul Walmsley
Cc: Shawn Guo
Cc: Sascha Hauer
Cc: Richard Zhao
Cc: Saravana Kannan
Cc: Magnus Damm
Cc: Rob Herring
Cc: Mark Brown
Cc: Linus Walleij
Cc: Stephen Boyd
Cc: Amit Kucheria
Cc: Deepak Saxena
Cc: Grant Likely
Signed-off-by: Arnd Bergmann
