summaryrefslogtreecommitdiffstats
path: root/include/linux/clk.h
Commit message (Collapse)AuthorAgeFilesLines
* clk: add pr_debug & kerneldoc around clk notifiersMike Turquette2014-02-241-0/+14
| | | | | | | | | Both the pr_err and the additional kerneldoc aim to help when debugging errors thrown from within a clock rate-change notifier callback. Reported-by: Sören Brinkmann <soren.brinkmann@xilinx.com> Acked-by: Sören Brinkmann <soren.brinkmann@xilinx.com> Signed-off-by: Mike Turquette <mturquette@linaro.org>
* clk: add clk accuracy retrieval supportBoris BREZILLON2013-12-221-0/+17
| | | | | | | | | | | | | | | | | | | | | | | | | | | 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 <b.brezillon@overkiz.com> Signed-off-by: Mike Turquette <mturquette@linaro.org>
* clk: Properly handle notifier return valuesSoren Brinkmann2013-04-101-4/+4
| | | | | | | | | | | | | | | | | Notifiers may return NOTIFY_(OK|DONE|STOP|BAD). The CCF uses an inconsistent mix of checking against NOTIFY_STOP or NOTIFY_BAD. This inconsistency leaves errors undetected in some cases: clk_set_parent() calls __clk_speculate_rates(), which stops when it hits a NOTIFIER_BAD (STOP is ignored), and passes this value back to the caller. clk_set_parent() compares this return value against NOTIFY_STOP only, ignoring NOTIFY_BAD returns. Use NOTIFY_STOP_MASK to detect a negative notifier return value and document all four return value options. Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Signed-off-by: Mike Turquette <mturquette@linaro.org>
* clk: add non CONFIG_HAVE_CLK routinesViresh Kumar2012-07-301-59/+109
| | | | | | | | | | | | | | | | | | | | | | | | | | Many drivers are shared between architectures that may or may not have HAVE_CLK selected for them. To remove compilation errors for them we enclose clk_*() calls in these drivers within #ifdef CONFIG_HAVE_CLK, #endif. This patch removes the need of these CONFIG_HAVE_CLK statements, by introducing dummy routines when HAVE_CLK is not selected by platforms. So, definition of these routines will always be available. These calls will return error for platforms that don't select HAVE_CLK. Signed-off-by: Viresh Kumar <viresh.kumar@st.com> Cc: Wolfram Sang <w.sang@pengutronix.de> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Jeff Garzik <jgarzik@redhat.com> Cc: Andrew Lunn <andrew@lunn.ch> Cc: Bhupesh Sharma <bhupesh.sharma@st.com> Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Mike Turquette <mturquette@linaro.org> Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com> Cc: viresh kumar <viresh.linux@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Merge tag 'clk-for-linus' of git://git.linaro.org/people/mturquette/linuxLinus Torvalds2012-07-241-0/+20
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pull common clk framework changes from Michael Turquette: "This includes a small number of core framework improvments, platform ports and new DT bindings." Fix up trivial conflicts in drivers/clk/Makefile * tag 'clk-for-linus' of git://git.linaro.org/people/mturquette/linux: (21 commits) clk: fix compile for OF && !COMMON_CLK clk: fix clk_get on of_clk_get_by_name return check clk: mxs: clk_register_clkdev mx28 usb clocks clk: add highbank clock support dt: add clock binding doc to primecell bindings clk: add DT fixed-clock binding support clk: add DT clock binding support ARM: integrator: convert to common clock clk: add versatile ICST307 driver ARM: integrator: put symbolic bus names on devices ARM: u300: convert to common clock clk: cache parent clocks only for muxes clk: wm831x: Add initial WM831x clock driver clk: Constify struct clk_init_data clk: Add CLK_IS_BASIC flag to identify basic clocks clk: Add support for rate table based dividers clk: Add support for power of two type dividers clk: mxs: imx28: decrease the frequency of ref_io1 for SSP2 and SSP3 clk: mxs: add clkdev lookup for pwm clk: mxs: Fix the GPMI clock name ...
| * clk: fix compile for OF && !COMMON_CLKRob Herring2012-07-191-1/+1
| | | | | | | | | | | | | | | | | | | | With commit 766e6a4ec602d0c107 (clk: add DT clock binding support), compiling with OF && !COMMON_CLK is broken. Reported-by: Alexandre Pereira da Silva <aletes.xgr@gmail.com> Reported-by: Prashant Gaikwad <pgaikwad@nvidia.com> Signed-off-by: Rob Herring <rob.herring@calxeda.com> Signed-off-by: Mike Turquette <mturquette@linaro.org>
| * clk: fix clk_get on of_clk_get_by_name return checkShawn Guo2012-07-191-2/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The commit 766e6a4 (clk: add DT clock binding support) plugs device tree clk lookup of_clk_get_by_name into clk_get, and fall on non-DT lookup clk_get_sys if DT lookup fails. The return check on of_clk_get_by_name takes (clk != NULL) as a successful DT lookup. But it's not the case. For any system that does not define clk lookup in device tree, ERR_PTR(-ENOENT) will be returned, and consequently, all the client drivers calling clk_get in their probe functions will fail to probe with error code -ENOENT returned. Fix the issue by checking of_clk_get_by_name return with !IS_ERR(clk), and update of_clk_get and of_clk_get_by_name for !CONFIG_OF build correspondingly. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Acked-by: Rob Herring <rob.herring@calxeda.com> Tested-by: Marek Vasut <marex@denx.de> Tested-by: Lauri Hintsala <lauri.hintsala@bluegiga.com> Signed-off-by: Mike Turquette <mturquette@linaro.org>
| * clk: add DT clock binding supportGrant Likely2012-07-111-0/+19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Based on work 1st by Ben Herrenschmidt and Jeremy Kerr, then by Grant Likely, this patch adds support to clk_get to allow drivers to retrieve clock data from the device tree. Platforms scan for clocks in DT with of_clk_init and a match table, and the register a provider through of_clk_add_provider. The provider's clk_src_get function will be called when a device references the provider's OF node for a clock reference. v6 (Rob Herring): - Return error values instead of NULL to match clock framework expectations v5 (Rob Herring): - Move from drivers/of into common clock subsystem - Squashed "dt/clock: add a simple provider get function" and "dt/clock: add function to get parent clock name" - Rebase to 3.4-rc1 - Drop CONFIG_OF_CLOCK and just use CONFIG_OF - Add missing EXPORT_SYMBOL to various functions - s/clock-output-name/clock-output-names/ - Define that fixed-clock binding is a single output v4 (Rob Herring): - Rework for common clk subsystem - Add of_clk_get_parent_name function v3: - Clarified documentation v2: - fixed errant ';' causing compile error - Editorial fixes from Shawn Guo - merged in adding lookup to clkdev - changed property names to match established convention. After working with the binding a bit it really made more sense to follow the lead of 'reg', 'gpios' and 'interrupts' by making the input simply 'clocks' & 'clock-names' instead of 'clock-input-*', and to only use clock-output* for the producer nodes. (Sorry Shawn, this will mean you need to change some code, but it should be trivial) - Add ability to inherit clocks from parent nodes by using an empty 'clock-ranges' property. Useful for busses. I could use some feedback on the new property name, 'clock-ranges' doesn't feel right to me. Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Rob Herring <rob.herring@calxeda.com> Reviewed-by: Shawn Guo <shawn.guo@freescale.com> Cc: Sascha Hauer <kernel@pengutronix.de> Signed-off-by: Mike Turquette <mturquette@linaro.org>
* | Fix typo in include/linux/clk.h .Jan-Simon Möller2012-07-241-2/+2
|/ | | | | | | Signed-off-by: Jan-Simon Möller <jansimon.moeller@gmx.de> Cc: Russell King <linux@arm.linux.org.uk> Cc: linux-kernel@vger.kernel.org Signed-off-by: Jiri Kosina <jkosina@suse.cz>
* Merge branch 'depends/rmk/clkdev' into next/clockArnd Bergmann2012-05-111-0/+32
|\ | | | | | | | | | | | | * depends/rmk/clkdev: CLKDEV: provide helpers for common clock framework ARM: 7392/1: CLKDEV: Optimize clk_find() ARM: 7376/1: clkdev: Implement managed clk_get()
| * ARM: 7376/1: clkdev: Implement managed clk_get()Mark Brown2012-04-191-0/+32
| | | | | | | | | | | | | | | | Allow clk API users to simplify their cleanup paths by providing a managed version of clk_get() and clk_put(). Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* | clk: remove trailing whitespace from clk.hRob Herring2012-04-241-2/+2
| | | | | | | | | | | | Remove trailing whitespace from 2 lines. Signed-off-by: Rob Herring <rob.herring@calxeda.com>
* | clk: Remove comment for end of CONFIG_COMMON_CLK sectionMark Brown2012-04-241-1/+1
|/ | | | | | | | | The comment is inaccurate (it actually ends the CONFIG_COMMON_CLK section, there's no else) and given that we've just got a single level of ifdef isn't really needed anyway. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Mike Turquette <mturquette@linaro.org>
* clk: introduce the common clock frameworkMike Turquette2012-03-161-5/+63
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The common clock framework defines a common struct clk useful across most platforms as well as an implementation of the clk api that drivers can use safely for managing clocks. The net result is consolidation of many different struct clk definitions and platform-specific clock framework implementations. This patch introduces the common struct clk, struct clk_ops and an implementation of the well-known clock api in include/clk/clk.h. Platforms may define their own hardware-specific clock structure and their own clock operation callbacks, so long as it wraps an instance of struct clk_hw. See Documentation/clk.txt for more details. This patch is based on the work of Jeremy Kerr, which in turn was based on the work of Ben Herrenschmidt. Signed-off-by: Mike Turquette <mturquette@linaro.org> Signed-off-by: Mike Turquette <mturquette@ti.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Andrew Lunn <andrew@lunn.ch> Reviewed-by: Rob Herring <rob.herring <at> calxeda.com> Cc: Russell King <linux@arm.linux.org.uk> Cc: Jeremy Kerr <jeremy.kerr@canonical.com> Cc: Arnd Bergman <arnd.bergmann@linaro.org> Cc: Paul Walmsley <paul@pwsan.com> Cc: Shawn Guo <shawn.guo@freescale.com> Cc: Sascha Hauer <s.hauer@pengutronix.de> Cc: Richard Zhao <richard.zhao@linaro.org> Cc: Saravana Kannan <skannan@codeaurora.org> Cc: Magnus Damm <magnus.damm@gmail.com> Cc: Mark Brown <broonie@opensource.wolfsonmicro.com> Cc: Linus Walleij <linus.walleij@stericsson.com> Cc: Stephen Boyd <sboyd@codeaurora.org> Cc: Amit Kucheria <amit.kucheria@linaro.org> Cc: Deepak Saxena <dsaxena@linaro.org> Cc: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
* clk: add helper functions clk_prepare_enable and clk_disable_unprepareRichard Zhao2011-12-281-0/+22
| | | | | | | | | | | | | | It's for migrating to generic clk framework API. The helper functions help cases clk_enable/clk_disable is used in non-atomic context. For example, Call clk_enable in probe and clk_disable in remove. Signed-off-by: Richard Zhao <richard.zhao@linaro.org> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Cc: Russell King <linux@arm.linux.org.uk> Acked-by: Marek Vasut <marek.vasut@gmail.com>
* clk: provide prepare/unprepare functionsRussell King2011-09-271-0/+43
| | | | | | | | | | | | | | | | | | | | | As discussed previously, there's the need on some platforms to run some parts of clk_enable() in contexts which can schedule. The solution which was agreed upon was to provide clk_prepare() and clk_unprepare() to contain this parts, while clk_enable() and clk_disable() perform the atomic part. This patch provides a common definition for clk_prepare() and clk_unprepare() in linux/clk.h, and provides an upgrade path for existing implementation and drivers: drivers can start using clk_prepare() and clk_unprepare() once this patch is merged without having to wait for platform support. Platforms can then start to provide these additional functions. Eventually, HAVE_CLK_PREPARE will be removed from the kernel, and everyone will have to provide these new APIs. Acked-by: Saravana Kannan <skannan@codeaurora.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [ARM] 5536/1: Move clk_add_alias() to arch/arm/common/clkdev.cTony Lindgren2009-06-041-0/+13
| | | | | | | | | | | This can be used for other arm platforms too as discussed on the linux-arm-kernel list. Also check the return value with IS_ERR and return PTR_ERR as suggested by Russell King. Signed-off-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* clkdev: add possibility to get a clock based on the device nameSascha Hauer2009-03-271-0/+17
| | | | | | | This adds clk_get_sys to get a clock without the associated struct device. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
* include/linux/clk.h: fix commentAlex Raimondi2008-10-161-0/+4
| | | | | | | | | | | | clk_get and clk_put may not be used from within interrupt context. Change comment to this function. Signed-off-by: Alex Raimondi <raimondi@miromico.ch> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com> Acked-by: Russell King <rmk+kernel@arm.linux.org.uk> Cc: john stultz <johnstul@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* include/linux/clk.h is betraying its ARM originsTodd Poynor2006-03-251-2/+2
| | | | | | | include/linux/clk.h is betraying its ARM origins. Signed-off-by: Todd Poynor <tpoynor@mvista.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [ARM] Move asm/hardware/clock.h to linux/clk.hRussell King2006-01-071-0/+124
This is needs to be visible to other architectures using the AMBA bus and peripherals. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
OpenPOWER on IntegriCloud