This is the initial stage to transfer the pxa25x and pxa27x CPU clocks
handling from cpufreq to the clock API. More precisely, the clocks
transferred are :
 - cpll : core pll, known also as the CPU core turbo frequency
 - core : core, known also as the CPU actual frequency, being either the
          CPU core turbo frequency or the CPU core run frequency

This transfer is a prequel to shrink the code in pxa2xx-cpufreq.c, so
that it can become, at least in devicetree builds, the casual cpufreq-dt
driver.
Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

Add frequency tables for a few RCG clocks in msm8996
Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

This would be useful in subsequent patches when the .set_rate operation
would need to identify if the PLL is actually enabled
Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
[sboyd@codeaurora.org: Simplify return statement of is_enabled op]
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

The votable alpha PLLs need to have the fsm mode enabled as part
of the initialization. The sequence seems to be the same as used
by clk-pll, so move the function which does this into a common
place and reuse it for the clk-alpha-pll
Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Taniya Das <tdas@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

Some alpha PLLs have support for only a 16bit programable Alpha Value
(as against the default 40bits). Add a flag to handle the 16bit alpha
registers
Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

Add a function to do initial configuration of the alpha plls
Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

Some PLLs can support an HW FSM mode (different from the Votable FSMs,
though its the same bit used to enable Votable FSMs as well as HW FSMs)
which enables the HW to do the bypass/reset/enable-output-ctrl sequence
on its own. So all thats needed from SW is to set the FSM_ENA bit.
PLL_ACTIVE_FLAG is whats used to check if the PLL is active/enabled.

Some of the PLLs which support HW FSM can also need an OFFLINE request
that needs to be toggled across the enable/disable. We use a flag to
identify such cases and handle them.
Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

* clk-fixes:
  clk: mmp: pxa910: fix return value check in pxa910_clk_init()
  clk: mmp: pxa168: fix return value check in pxa168_clk_init()
  clk: mmp: mmp2: fix return value check in mmp2_clk_init()
  clk: qoriq: Don't allow CPU clocks higher than starting value

The current I2C freq table uses MND values which is not
applicable for I2C since its RCG does not have MND
counter. This patch updates the freq table for 19.05
MHz clk frequency with FEPLL_200 parent.
Signed-off-by: Abhishek Sahu <absahu@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

pxaxxx_get_clk_frequency_khz() needs several clocks to be available
through clk_get(), ie. the cpu clocks, system bus clock and memory
clocks.

Add the missing clkdev so that their rate can be acquired.
Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

The meaning of this bit was inverted :
 - when set to 0, system bus clock is half of the CPU run clock
 - when set to 1, system bus clock is the CPU run clock
Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

The t bit of clkfcfg doesn't affect the core pll clock, but it makes core
clock select between core pll clock and core run clock.

As such remove it from the core pll rate reporting function, while it
remains in clk_pxa27x_core_get_parent().
Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

This is a cleanup patch to remove unused values not used in their
respective functions.
Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

Signed-off-by: Mingkai Hu <mingkai.hu@nxp.com>
Signed-off-by: Shaohui Xie <Shaohui.Xie@nxp.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

Drop the assignment of regmap_read return code to val, so the code checks
the value read.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

Fix the retrn value check which testing the wrong variable
in pxa910_clk_init().

Fixes: 2bc61da9 ("clk: mmp: add pxa910 DT support for clock driver")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

Fix the retrn value check which testing the wrong variable
in pxa168_clk_init().

Fixes: ab08aefc ("clk: mmp: add pxa168 DT support for clock driver")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

Fix the retrn value check which testing the wrong variable
in mmp2_clk_init().

Fixes: 1ec770d9 ("clk: mmp: add mmp2 DT support for clock driver")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

Adjust variables to correspond to the names used in the parameter list of
the function.  Move the struct device * variable up to the place where it
appears in the parameter list.

Issue detected using Coccinelle (http://coccinelle.lip6.fr/)
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

Adjust the documentation to use the actual function names.

Issue detected using Coccinelle (http://coccinelle.lip6.fr/)
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

Now that we have clk_hw based provider APIs to register clks, we
can get rid of struct clk pointers while registering clks in Armada
CP110 system controller driver. This commit introduces new
API and registration for all clocks in CP110 HW blocks.
Signed-off-by: Marcin Wojtas <mw@semihalf.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

s2mps11 and max77686 clock drivers can be compile tested to increase
build coverage.
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

The intention was to enable the checks if debugging is enabled, not
disabled.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

Free memory mapping, if lpc18xx_ccu_init() is not successful.
Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Acked-by: Joachim Eastwood <manabian@gmail.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

In common clock framework CLK_DIVIDER_ONE_BASED or'ed with
CLK_DIVIDER_ALLOW_ZERO flags indicates that
1) a divider clock may be set to zero value,
2) divider's zero value is interpreted as a non-divided clock.

On the LPC32xx platform clock dividers of PWM and memory card clocks
comply with the first condition, but zero value means a gated clock,
thus it may happen that the divider value is not updated when
the clock is enabled and the clock remains gated.

The change adds one-shot quirks, which check for zero value of divider
on initialization and set it to a non-zero value, therefore in runtime
a gate clock will work as expected.
Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Reviewed-by: Sylvain Lemieux <slemieux.tyco@gmail.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

The boot-time frequency of a CPU is considered its rated maximum, as we
have no other source of such information.  However, this was previously
only used for chips with 80% restrictions on secondary PLLs.  This
usually wasn't a problem because most chips/configs boot with a divider
of /1, with other dividers being used only for dynamic frequency
reduction.  However, at least one config (LS1021A at less than 1 GHz)
uses a different divider for top speed.  This was causing cpufreq to set
a frequency beyond the chip's rated speed.

This is fixed by applying a 100%-of-initial-speed limit to all CPU PLLs,
similar to the existing 80% limit that only applied to some.
Signed-off-by: Scott Wood <oss@buserror.net>
Cc: stable@vger.kernel.org
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

Add gpu gdsc data for msm8996
Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

Add a flag to mark gdscs which need to support the clamp deassert/assert
before and after the gdsc enable/disable
Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

The audio and video PLLs are designed to have a precision of 1 Hz if some
conditions are met. The current implementation only allows a precision that
depends on the rate of the parent clock. E.g., if the parent clock is 24
MHz, the precision will be 24 Hz; or more generally the precision will be

    p / 10^6 Hz

where p is the parent clock rate. This comes down to how the register
values for the PLL's fractional loop divider are chosen.

The clock rate calculation for the PLL is

    PLL output frequency = Fref * (DIV_SELECT + NUM / DENOM)

or with a shorter notation

    r = p * (d + a / b)

In addition to all variables being integers, we also have the following
conditions:

    27 <= d <= 54

    -2^29 <= a <= 2^29-1
     0    <  b <= 2^30-1
    |a| < b

Here, d, a and b are register values for the fractional loop divider. We
want to chose d, a and b such that f(p, r) = p, i.e. f is our round_rate
function. Currently, d and b are chosen as

    d = r / p
    b = 10^6

hence we get the poor precision. And a is defined in terms of r, d, p and
b:

    a = (r - d * p) * b / p

I propose that if p <= 2^30-1 (i.e., the max value for b), we chose b as

    b = p

We can do this since

    |a| < b

    |(r - d * p) * b / p| < b

    |r - d * p| < p

Which have two solutions, one of them is when p < 0, so we can skip that
one. The other is when p > 0 and

    p * (d - 1) < r < p * (d + 1)

Substitute d = r / p:

    (r - p) < r < (r + p)  <=>  p > 0

So, as long as p > 0, we can chose b = p. This is a good choise for b since

    a = (r - d * p) * b / p
      = (r - d * p) * p / p
      = r - d * p

    r = p * (d + a / b)
      = p * d + p * a / b
      = p * d + p * a / p
      = p * d + a

and if d = r / p:

    a = r - d * p
      = r - r / p * p
      = 0

    r = p * d + a
      = p * d + 0
      = p * r / p
      = r

I reckon this is the intention by the design of the clock rate formula.
Signed-off-by: Emil Lundmark <emil@limesaudio.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Acked-by: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

* clk-fixes:
  clk: imx: fix integer overflow in AV PLL round rate
  clk: xgene: Don't call __pa on ioremaped address
  clk: rockchip: don't return NULL when failing to register ddrclk branch

Merge tag 'v4.9-rockchip-clkfixes1' of git://git.kernel.org/pub/scm/linux/kernel/git/mmind/linux-rockchip into clk-fixes

Fix return value in error case of new ddrclk type.

* tag 'v4.9-rockchip-clkfixes1' of git://git.kernel.org/pub/scm/linux/kernel/git/mmind/linux-rockchip:
  clk: rockchip: don't return NULL when failing to register ddrclk branch

Since 'parent_rate * mfn' may overflow 32 bits, the result should be
stored using 64 bits.

The problem was discovered when trying to set the rate of the audio PLL
(pll4_post_div) on an i.MX6Q. The desired rate was 196.608 MHz, but
the actual rate returned was 192.000570 MHz. The round rate function should
have been able to return 196.608 MHz, i.e., the desired rate.

Fixes: ba7f4f55 ("clk: imx: correct AV PLL rate formula")
Cc: Anson Huang <b20788@freescale.com>
Signed-off-by: Emil Lundmark <emil@limesaudio.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Acked-by: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

ioremaped addresses are not linearly mapped so the physical
address can not be figured out via __pa. More generally, there
is no guarantee that backing value of an ioremapped address
is a physical address at all. The value here is only used
for debugging so just drop the call to __pa on the ioremapped
address.

Fixes: 6ae5fd38 ("clk: xgene: Silence sparse warnings")
Signed-off-by: Laura Abbott <labbott@redhat.com>
Acked-by: Loc Ho <lho@apm.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

This patch adds the QSPI clock for stm32f469 discovery board.
The gate mapping is a little bit different from stm32f429 soc.
Signed-off-by: Gabriel Fernandez <gabriel.fernandez@st.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

This patch introduces the support of the RTC clock.
RTC clock can have 3 sources: lsi, lse and hse_rtc.
Signed-off-by: Gabriel Fernandez <gabriel.fernandez@st.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

This patch introduces the support of the LSI & LSE clocks.
The clock drivers needs to disable the power domain write protection
using syscon/regmap to enable these clocks.
Signed-off-by: Gabriel Fernandez <gabriel.fernandez@st.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

* clk-fixes:
  clk/samsung: Use CLK_OF_DECLARE_DRIVER initialization method for CLKOUT

The Exynos PMU node is an interrupt, clock and PMU (Power Management Unit)
controller, and these functionalities are supported by different drivers
that matches the same compatible strings.

Since commit 989eafd0 ("clk: core: Avoid double initialization of
clocks") the OF core flags clock controllers registered with the
CLK_OF_DECLARE() macro as OF_POPULATED, so platform devices with the same
compatible string will not be registered.

This prevents the PMU platform device to be created, so the Exynos PMU
driver is never probed. This breaks (among other things) Suspend-to-RAM.

Fix this by changing CLKOUT driver initialization method to
CLK_OF_DECLARE_DRIVER(), which doesn't clear the OF_POPULATED flag, so
later a platform device is created and the Exynos PMU platform driver
can be be probed properly.

Fixes: 989eafd0 ("clk: core: Avoid double initialization of clocks")
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>
Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

Add OX820 bindings and remove clock indices from bindings since they are present
in the dt-bindings headers files.
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Michael Turquette <mturquette@baylibre.com>
Link: lkml.kernel.org/r/20161005150752.22618-7-narmstrong@baylibre.com