Components of the Versatile Express platform (configuration
microcontrollers on motherboard and daughterboards in particular)
talk to each other over a custom configuration bus. They
provide miscellaneous functions (from clock generator control
to energy sensors) which are represented as platform devices
(and Device Tree nodes). The transactions on the bus can
be generated by different "bridges" in the system, some
of which are universal for the whole platform (for the price
of high transfer latencies), others restricted to a subsystem
(but much faster).

Until now drivers for such functions were using custom "func"
API, which is being replaced in this patch by regmap calls.
This required:

* a rework (and move to drivers/bus directory, as suggested
  by Samuel and Arnd) of the config bus core, which is much
  simpler now and uses device model infrastructure (class)
  to keep track of the bridges; non-DT case (soon to be
  retired anyway) is simply covered by a special device
  registration function

* the new config-bus driver also takes over device population,
  so there is no need for special matching table for
  of_platform_populate nor "simple-bus" hack in the arm64
  model dtsi file (relevant bindings documentation has
  been updated); this allows all the vexpress devices
  fit into normal device model, making it possible
  to remove plenty of early inits and other hacks in
  the near future

* adaptation of the syscfg bridge implementation in the
  sysreg driver, again making it much simpler; there is
  a special case of the "energy" function spanning two
  registers, where they should be both defined in the tree
  now, but backward compatibility is maintained in the code

* modification of the relevant drivers:

  * hwmon - just a straight-forward API change
  * power/reset driver - API change
  * regulator - API change plus error handling
    simplification
  * osc clock driver - this one required larger rework
    in order to turn in into a standard platform driver
Signed-off-by: NPawel Moll <pawel.moll@arm.com>
Acked-by: NMark Brown <broonie@linaro.org>
Acked-by: NLee Jones <lee.jones@linaro.org>
Acked-by: NGuenter Roeck <linux@roeck-us.net>
Acked-by: NMike Turquette <mturquette@linaro.org>

Following arm64 commit bc3ee18a (arm64: init: Move of_clk_init to
time_init()), vexpress_osc_of_setup() is called via of_clk_init() long
before initcalls are issued. Initialising the vexpress oscillators
requires the vespress sysregs to be already initialised, so this patch
adds an explicit call to vexpress_sysreg_of_early_init() in vexpress
oscillator setup function.
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
Tested-by: NWill Deacon <will.deacon@arm.com>
Acked-by: NWill Deacon <will.deacon@arm.com>
Tested-by: NPawel Moll <pawel.moll@arm.com>
Acked-by: NPawel Moll <pawel.moll@arm.com>
Cc: Mike Turquette <mturquette@linaro.org>

The Tegra124 clock driver currently provides 3 clocks that don't actually
exist; 2 for NAND and one for UART5/UARTE. Delete these.

Cc: <stable@vger.kernel.org>
Signed-off-by: NStephen Warren <swarren@nvidia.com>
Signed-off-by: NArnd Bergmann <arnd@arndb.de>

If the allocation fails then we dereference the NULL in the error path.
Just return directly.

Fixes: ed27ff1d ('clk: Versatile Express clock generators ("osc") driver')
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NPawel Moll <pawel.moll@arm.com>

If the driver needs to change a clock rate, then it must be propogated
through the MSTP clock to the parent clock (such as shdi0 -> sd0). Without
this we cannot up-rate default clocks which are really slow (such as the
mmcif1 which defaults to 12MHz where it could be running at 97MHz)
Signed-off-by: NBen Dooks <ben.dooks@codethink.co.uk>
Acked-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

The clock generator for rcar-gen2 has the lb, sdh, sd0 and sd1 clocks
parented to pll1_div2 where the hardware diagram shows these to be
directly fed from pll1.

This fixes the initial rate for sdh0 clock to be 97.5MHz instead of
the reported 48MHz where the manual says the default register values
are for 97.5MHz.
Signed-off-by: NBen Dooks <ben.dooks@codethink.co.uk>
Acked-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

Signed-off-by: NSylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

This restores the default clocks registration order as parsed from
devicetree, i.e. as before commit 1771b10d
"clk: respect the clock dependencies in of_clk_init", for when there
is no explicit parent clock dependencies between clock providers
specified in the device tree.

It prevents regressions (boot failure, division by 0 errors) on
imx and exynos platforms.
Signed-off-by: NSylwester Nawrocki <s.nawrocki@samsung.com>
Tested-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

Signed-off-by: NBarry Song <Baohua.Song@csr.com>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

The orignal code will use the bigger rate between
"previous rate" and "current rate" when caculate the
rate.
In fact, hardware cares about the closest one.
So choose the closer rate between "previous rate" and
"current rate".
Signed-off-by: NChao Xie <chao.xie@marvell.com>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

The formula is numerator/denominator = Fin / (Fout * factor)
So
Fout = Fin * denominator / (numerator * factor).
Current clk_factor_round_rate and clk_factor_recalc_rate use
wrong formula. This patch will fix them.
Signed-off-by: NChao Xie <chao.xie@marvell.com>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

The code has typo when calculate denominator. It should use
den_mask instead of num_mask.
Signed-off-by: NChao Xie <chao.xie@marvell.com>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

The patch supports the A9-mux clocks used by ClockGenA9

A9-mux clock : Multiplexer inside ClockGenA9. A9 clock can be driven by
either PLL or External clock (with an optional divide-by-2). This is
implemented as 3-parent clock : PLL, Ext-clk OR Ext-clk/2
Signed-off-by: NPankaj Dev <pankaj.dev@st.com>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

The patch added support for DT registration of ClockGenA9/DDR/GPU

ClockgenA9/DDR : It includes c32 type PLL (also in ClockgenA1x), hence
only CLK_OF_DECLARE implementation is required.

ClockgenGPU : It includes c65 type PLL (also in ClockgenAx), hence
only CLK_OF_DECLARE implementation is required.
Signed-off-by: NPankaj Dev <pankaj.dev@st.com>
Signed-off-by: NGabriel Fernandez <gabriel.fernandez@st.com>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

The patch supports the 216/432/660 type Quad Frequency Synthesizers
used by ClockGenB/C/D/E/F

QUADFS clock : It includes support for all 216/432/660 type Quad
Frequency Synthesizers : implemented as Fixed Parent / Rate / Gate clock,
with clock rate calculated reading H/w settings done at BOOT.

QuadFS have 4 outputs : chan0 chan1 chan2 chan3
Signed-off-by: NPankaj Dev <pankaj.dev@st.com>
Signed-off-by: NGabriel Fernandez <gabriel.fernandez@st.com>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

The patch supports the VCC-mux and MUX clocks used by ClockGenC/F

VCC-mux clock : Divider-Multiplexer-Gate inside ClockGenC/F
It includes support for each channel : 4-parent Multiplexer, Post Divide
by 1, 2, 4 or 8, Gate to switch OFF the output channel. The clock is
implemented using generic clocks implemented in the kernel clk_divider, clk_mux,
clk_gate and clk_composite (to combine all)

MUX clock : 2-parent clock used inside ClockGenC/F. The clock is implemented
using generic clocks implemented in the kernel clk_mux.
Signed-off-by: NPankaj Dev <pankaj.dev@st.com>
Signed-off-by: NGabriel Fernandez <gabriel.fernandez@st.com>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

The patch supports the c65/c32 type PLLs used by ClockGenA(s)

PLL clock : It includes support for all c65/c32 type PLLs
inside ClockGenA(s) : implemented as Fixed Parent / Fixed Rate clock,
with clock rate calculated reading H/w settings done at BOOT.

c65 PLLs have 2 outputs : HS and LS
c32 PLLs have 1-4 outputs : ODFx
Signed-off-by: NPankaj Dev <pankaj.dev@st.com>
Signed-off-by: NGabriel Fernandez <gabriel.fernandez@st.com>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

The patch supports the DIVMUX and PreDiv clocks used by ClockGenA(s)

DIVMUX clock : Divider-Multiplexer-Gate inside ClockGenA(s)
It includes support for each channel : 3-parent Multiplexer,
Divider for each Parent, Gate to switch OFF the output channel. The
clock is implemented using generic clocks implemented in the kernel
clk_divider and clk_mux.

PreDiv clock : Fixed Divider Clock used inside ClockGenA(s) to divide
the oscillator clock by factor-of-16. The clock is implemented using
generic clocks implemented in the kernel clk_divider.
Signed-off-by: NPankaj Dev <pankaj.dev@st.com>
Signed-off-by: NGabriel Fernandez <gabriel.fernandez@st.com>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

Add a new clk_ops->debug_init method to allow a clock hardware
driver to populate the clock's debugfs directory with entries
beyond those common for every clock.
Signed-off-by: NAlex Elder <elder@linaro.org>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

of_find_node_by_name() walks over all nodes and can thus walk outside of
the parent node. Use of_get_child_by_name() instead.
Signed-off-by: NKrzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

If parent device does not have of_node set the s2mps11_clk_parse_dt()
returned NULL. This NULL was later passed to of_clk_add_provider() which
dereferenced it in pr_debug() call.
Signed-off-by: NKrzysztof Kozlowski <k.kozlowski@samsung.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

drivers/clk/hisilicon/clk-hi3620.c:338
mmc_clk_delay() warn: always true condition '(para >= 0) => (0-u32max >= 0)'
Reported-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NZhangfei Gao <zhangfei.gao@linaro.org>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

Signed-off-by: NWolfram Sang <wsa@sang-engineering.com>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

If a rate change failed it's the opportunity of the caller to handle
this. Do not spam the log with a message.
Signed-off-by: NSascha Hauer <s.hauer@pengutronix.de>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: NMike Turquette <mturquette@linaro.org>

Most of the clock related dt-binding header files are located in
dt-bindings/clock folder. It would be good to keep all the similar
header files at a single location.
Signed-off-by: NTushar Behera <tushar.behera@linaro.org>
Reviewed-by: NSachin Kamat <sachin.kamat@linaro.org>
Acked-by: NTomasz Figa <t.figa@samsung.com>
Signed-off-by: NKukjin Kim <kgene.kim@samsung.com>

Until now the clock providers were initialized in the order found in
the device tree. This led to have the dependencies between the clocks
not respected: children clocks could be initialized before their
parent clocks.

Instead of forcing each platform to manage its own initialization order,
this patch adds this work inside the framework itself.

Using the data of the device tree the of_clk_init function now delayed
the initialization of a clock provider if its parent provider was not
ready yet.

The strict dependency check (all parents of a given clk must be
initialized) was added by Boris BREZILLON
Signed-off-by: NGregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: NBoris BREZILLON <b.brezillon@overkiz.com>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

The clock bindings for Freescale CoreNet platform are updated.
So, the driver needs to be updated accordingly.
The main changes include:
	- Added a new node to present the input system clock
	- Changed PLL and MUX's compatible string
Signed-off-by: NTang Yuantian <Yuantian.Tang@freescale.com>
Acked-by: NScott Wood <scottwood@freescale.com>
Signed-off-by: NMike Turquette <mturquette@linaro.org>

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>

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>

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>

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>

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>