The PCKRDY bit is not set until the system clock is enabled.
This patch moves the management of the ready status in the system clock
driver.
Signed-off-by: NBoris BREZILLON <b.brezillon@overkiz.com>
Signed-off-by: NJean-Jacques Hiblot <jjhiblot@traphandler.com>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

System clks are just gates, and thus do not provide any rate operations.
Authorize clk rate change to be propagated to system clk parents.
Signed-off-by: NBoris BREZILLON <b.brezillon@overkiz.com>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

Implement the determine_rate callback to choose the best parent clk that
fulfills the requested rate.
Signed-off-by: NBoris BREZILLON <b.brezillon@overkiz.com>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

Briefly document the common clock framework locking scheme from a clock
driver point of view.
Signed-off-by: NLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

Merge tag 'clk-hisi' of https://git.kernel.org/pub/scm/linux/kernel/git/hzhuang1/linux into clk-next-hisilcon

updating clock drivers for Hisilicon

This should read MOD0 and not MMC; MMC is just one example of a MOD0
clock.
Signed-off-by: NEmilio López <emilio@elopez.com.ar>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

Some divisor calculations were misrounded, causing higher than requested
rates on some clocks. Fix them up using DIV_ROUND_UP, and replace one
homebrew instance of it as well with the right macro.
Reported-by: NBoris BREZILLON <b.brezillon.dev@gmail.com>
Signed-off-by: NEmilio López <emilio@elopez.com.ar>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

Allwinner actually reworked the PLL4 on A20; now it's compatible with
the sun4i PLL5/6 design previous to any divisions, as well as to the new
PLL8 in sun7i.
Signed-off-by: NEmilio López <emilio@elopez.com.ar>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

Allwinner sunXi SoCs clock changes

This adds support for the new, more correct clock node naming and gets
the A10 compatibles in line with the rest of the other SoCs. It also
adds support for the USB, GMAC and A31's PLL6 clocks. Some of these
changes also require DT modifications that will be merged via arm-soc.

Remove the static variable. So these common clock register helper could
be used in more SoCs.
Signed-off-by: NHaojian Zhuang <haojian.zhuang@linaro.org>

Now only fixed rate clocks are appended into the clock driver.
Signed-off-by: NHaojian Zhuang <haojian.zhuang@linaro.org>

The fixed rate and fixed factor clock isn't registered to clk table.
Signed-off-by: NHaojian Zhuang <haojian.zhuang@linaro.org>

WARNING: drivers/clk/socfpga/built-in.o(.data+0xc0): Section mismatch in
reference from the variable socfpga_child_clocks to the function
.init.text:socfpga_pll_init()
The variable socfpga_child_clocks references
the function __init socfpga_pll_init()
If the reference is valid then annotate the
variable with __init* or __refdata (see linux/init.h) or name the variable:
*_template, *_timer, *_sht, *_ops, *_probe, *_probe_one, *_console

WARNING: drivers/clk/socfpga/built-in.o(.data+0x184): Section mismatch in
reference from the variable socfpga_child_clocks to the function
.init.text:socfpga_periph_init()
The variable socfpga_child_clocks references
the function __init socfpga_periph_init()
If the reference is valid then annotate the
variable with __init* or __refdata (see linux/init.h) or name the variable:
*_template, *_timer, *_sht, *_ops, *_probe, *_probe_one, *_console

WARNING: drivers/clk/socfpga/built-in.o(.data+0x248): Section mismatch in
reference from the variable socfpga_child_clocks to the function
.init.text:socfpga_gate_init()
The variable socfpga_child_clocks references
the function __init socfpga_gate_init()
If the reference is valid then annotate the
variable with __init* or __refdata (see linux/init.h) or name the variable:
*_template, *_timer, *_sht, *_ops, *_probe, *_probe_one, *_console
Reported-by: NMike Turquette <mturquette@linaro.org>
Signed-off-by: NDinh Nguyen <dinguyen@altera.com>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

clock: mvebu new SoC changes for v3.15 (incremental pull #2)

 - mvebu (Armada 375)
    - fix ratio register offest

 - mvebu (Armada 380)
    - expand core divider clock driver to support 380 SoC (enables nand support)

Since clock operation within S2MPS11 and S5M8767 are similar, we can
support both the devices within a single driver.
Signed-off-by: NTushar Behera <tushar.behera@linaro.org>
Reviewed-by: NTomasz Figa <t.figa@samsung.com>
Reviewed-by: NYadwinder Singh Brar <yadi.brar@samsung.com>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

The clocks in S2MPS11 and S5M8767 are managed in the same way, baring
a difference in the register offset. It would be better to update
existing S2MPS11 driver to support the clocks in S5M8767, rather than
creating an almost duplicate driver altogether.
Signed-off-by: NTushar Behera <tushar.behera@linaro.org>
Reviewed-by: NTomasz Figa <t.figa@samsung.com>
Reviewed-by: NYadwinder Singh Brar <yadi.brar@samsung.com>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

MOXA ART SoCs allow to determine PLL output and APB frequencies
by reading registers holding multiplier and divisor information.

Add a clock driver for this SoC.
Signed-off-by: NJonas Jensen <jonas.jensen@gmail.com>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

The Core Divider clock support two new compatible strings for Armada
375 and Armada 380 SoCs. Add the compatible strings to the documentation.
Signed-off-by: NEzequiel Garcia <ezequiel.garcia@free-electrons.com>
Link: https://lkml.kernel.org/r/1394742273-5113-7-git-send-email-ezequiel.garcia@free-electrons.comSigned-off-by: NJason Cooper <jason@lakedaemon.net>

This commit adds support for the Core Divider clocks of the Armada
380 SoCs. Similarly to Armada 370 and XP, the Core Divider clocks of
the 380 have gate capabilities. The only difference is the register layout.
Signed-off-by: NEzequiel Garcia <ezequiel.garcia@free-electrons.com>
Link: https://lkml.kernel.org/r/1394742273-5113-2-git-send-email-ezequiel.garcia@free-electrons.comSigned-off-by: NJason Cooper <jason@lakedaemon.net>

This commit fixes the ratio register offset which is 0x4,
as per the Armada 375 SoC specification.
Signed-off-by: NEzequiel Garcia <ezequiel.garcia@free-electrons.com>
Link: https://lkml.kernel.org/r/1394638901-13368-2-git-send-email-ezequiel.garcia@free-electrons.comSigned-off-by: NJason Cooper <jason@lakedaemon.net>

ti/clk-divider.c does not calculate the rates consistently at the moment.

As an example, on OMAP3 we have a clock divider with a source clock of
864000000 Hz. With dividers 6, 7 and 8 the theoretical rates are:

6: 144000000
7: 123428571.428571...
8: 108000000

Calling clk_round_rate() with the rate in the first column will give the
rate in the second column:

144000000 -> 144000000
143999999 -> 123428571
123428572 -> 123428571
123428571 -> 108000000

Note how clk_round_rate() returns 123428571 for rates from 123428572 to
143999999, which is mathematically correct, but when clk_round_rate() is
called with 123428571, the returned value is surprisingly 108000000.

This means that the following code works a bit oddly:

rate = clk_round_rate(clk, 123428572);
clk_set_rate(clk, rate);

As clk_set_rate() also does clock rate rounding, the result is that the
clock is set to the rate of 108000000, not 123428571 returned by the
clk_round_rate.

This patch changes the ti/clk-divider.c to use DIV_ROUND_UP when
calculating the rate. This gives the following behavior which fixes the
inconsistency:

144000000 -> 144000000
143999999 -> 123428572
123428572 -> 123428572
123428571 -> 108000000
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

clk-divider.c does not calculate the rates consistently at the moment.

As an example, on OMAP3 we have a clock divider with a source clock of
864000000 Hz. With dividers 6, 7 and 8 the theoretical rates are:

6: 144000000
7: 123428571.428571...
8: 108000000

Calling clk_round_rate() with the rate in the first column will give the
rate in the second column:

144000000 -> 144000000
143999999 -> 123428571
123428572 -> 123428571
123428571 -> 108000000

Note how clk_round_rate() returns 123428571 for rates from 123428572 to
143999999, which is mathematically correct, but when clk_round_rate() is
called with 123428571, the returned value is surprisingly 108000000.

This means that the following code works a bit oddly:

rate = clk_round_rate(clk, 123428572);
clk_set_rate(clk, rate);

As clk_set_rate() also does clock rate rounding, the result is that the
clock is set to the rate of 108000000, not 123428571 returned by the
clk_round_rate.

This patch changes the clk-divider.c to use DIV_ROUND_UP when
calculating the rate. This gives the following behavior which fixes the
inconsistency:

144000000 -> 144000000
143999999 -> 123428572
123428572 -> 123428572
123428571 -> 108000000
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

cppcheck detected following error
[clk-master.c:245]: (error) Memory leak: characteristics

The original code forgot to free characteristics when
irq_of_parse_and_map() failed.
Signed-off-by: NMasanari Iida <standby24x7@gmail.com>
Acked-by Boris BREZILLON <b.brezillon@overkiz.com>
Acked-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

This patch adds support for the new v2 version of the axi-clkgen core.
Unfortunately the method of accessing the registers is quite different on v2,
while the content still stays largely the same. So the patch adds a small
abstraction layer which implements the specific read and write functions for v1
and v2 in callback functions.
Signed-off-by: NLars-Peter Clausen <lars@metafoo.de>

Suggest by Arnd: abstract mmc tuning as clock behavior,
also because different soc have different tuning method and registers.
hi3620_mmc_clks is added to handle mmc clock specifically on hi3620.
Signed-off-by: NZhangfei Gao <zhangfei.gao@linaro.org>
Acked-by: NArnd Bergmann <arnd@arndb.de>
Acked-by: NJaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

The PLLs can be from 3 different sources: osc1, osc2, or the f2s_ref_clk.
Update the clock driver to be able to get the correct parent.
Signed-off-by: NDinh Nguyen <dinguyen@altera.com>
Cc: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

Use 64-bit integer for calculating clock rate. Also use do_div for the
64-bit division.
Signed-off-by: NGraham Moore <grmoore@altera.com>
Signed-off-by: NDinh Nguyen <dinguyen@altera.com>
Cc: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

The Nomadik debugfs screws up multiplatform boots if debugfs
is enabled on the multiplatform image, since it's a simple
initcall that is unconditionally executed and reads from certain
memory locations.

Fix this by checking that the driver has been properly
initialized, so a base offset to the Nomadik SRC controller
exists, before proceeding to register debugfs files.
Reported-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
Reviewed-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

Do not use readl/writel directly because the whole
clk subsystem is using clk_readl/clk_writel functions.
Signed-off-by: NMichal Simek <michal.simek@xilinx.com>
Acked-by: NSoren Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

These variable clocks have nothing to do with MSTP gating, probably a
copy&paste leftover.
Signed-off-by: NWolfram Sang <wsa@sang-engineering.com>
Acked-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

cpu0 clock node has no functionality, since cpufreq-cpu0 is already
capable of picking up the clock from dts.
Signed-off-by: NNishanth Menon <nm@ti.com>
Acked-by: NTero Kristo <t-kristo@ti.com>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

Ensure clk->kref is dereferenced only when clk is not NULL.
Signed-off-by: NSylwester Nawrocki <s.nawrocki@samsung.com>
Tested-by: NSachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

At probe time, a clock device may not be ready when some other device
wants to use it.

This patch lets the functions clk_get/devm_clk_get return a probe defer
when the clock is defined in the DT but not yet available.
Signed-off-by: NJean-Francois Moine <moinejf@free.fr>
Reviewed-by: NSylwester Nawrocki <s.nawrocki@samsung.com>
Tested-by: NSylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

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: NSören Brinkmann <soren.brinkmann@xilinx.com>
Acked-by: NSören Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

Merge branch 'clk-tegra-more-fixes-3.14' of git://nv-tegra.nvidia.com/user/pdeschrijver/linux into clk-fixes

Fixes stray access to undefined registers, use of wrong clock parents &
running clocks at wrong rates. All of these issues cause regressions in
the form of boards that are unable to boot or crash and die horrible
deaths.

The DT bindings document a renesas,indices property, while the code, the
DT example and the DT sources all use renesas,clock-indices. Fix the
documentation.

The shmobile mstp DT bindings have been merged in v3.14-rc1 with a bug
in the DT ABI, a fix during the -rc series is appropriate.
Reported-by: NGeert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: NLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: NSimon Horman <horms@verge.net.au>

The qspi clock divisor is incorrectly set to twice the value it should
have, possibly because it has been computed based on PLL1 as the clock
parent instead of PLL1 / 2 (the datasheets specifies the qspi nominal
frequencies, not the divisor values). Fix it.

This bug introduced in v3.14-rc1 breaks various devices on the Lager and
Kolesh shmobile boards and should thus be considered as a regression for
which a fix during the -rc series is appropriate.
Reported-by: NGeert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: NLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: NSimon Horman <horms+renesas@verge.net.au>