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Add support for the display clock controller found on SC7180
based devices. This would allow display drivers to probe and
control their clocks.
Signed-off-by: Taniya Das <tdas@codeaurora.org>
Link: https://lkml.kernel.org/r/1573812245-23827-4-git-send-email-tdas@codeaurora.org
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
In the cases where the PLL is not calibrated the PLL could fail to lock.
Add support for prepare ops which would take care of the same.
Fabia PLL user/test control registers might required to be configured, so
add support for configuring them.
Signed-off-by: Taniya Das <tdas@codeaurora.org>
Link: https://lkml.kernel.org/r/1573812304-24074-3-git-send-email-tdas@codeaurora.org
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
If the init callback is allowed to request resources, it needs a return
value to report the outcome of such a request.
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Link: https://lkml.kernel.org/r/20190924123954.31561-3-jbrunet@baylibre.com
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Acked-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
__clk_init_parent() will call the .get_parent() callback of the clock
so .init() must run before.
Fixes: 541debae0adf ("clk: call the clock init() callback before any other ops callback")
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Link: https://lkml.kernel.org/r/20190924123954.31561-2-jbrunet@baylibre.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
gcc_bimc_gfx_clk is a required clock for booting the GPU and GPU SMMU.
Fixes: 4807c71cc688 (arm64: dts: Add msm8998 SoC and MTP board support)
Signed-off-by: Jeffrey Hugo <jeffrey.l.hugo@gmail.com>
Link: https://lkml.kernel.org/r/20191217164913.4783-1-jeffrey.l.hugo@gmail.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Switch the entire clk-imx8mq driver to clk_hw based API.
This allows us to move closer to a clear split between
consumer and provider clk APIs.
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Switch the entire clk-imx8mm driver to clk_hw based API.
This allows us to move closer to a clear split between
consumer and provider clk APIs.
Reviewed-by: Abel Vesa <abel.vesa@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Switch the entire clk-imx8mn driver to clk_hw based API.
This allows us to move closer to a clear split between
consumer and provider clk APIs.
Reviewed-by: Abel Vesa <abel.vesa@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Some of i.MX SoCs' clock driver will use platform driver model,
and they need to call imx_obtain_fixed_clk_hw() API, so
imx_obtain_fixed_clk_hw() API should NOT be in .init section.
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Switch the imx_clk_hw_gate3_flags function to clk_hw based API, rename
accordingly and add a macro for clk based legacy. This allows us to
move closer to a clear split between consumer and provider clk APIs.
Reviewed-by: Abel Vesa <abel.vesa@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Introduce hw based API imx_clk_hw_mux2_flags, then we could
convert i.MX8MN clk driver to use hw based APIs.
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
There is a non hw API based imx_unregister_clocks to unregister clocks
when of_clk_add_provider failed. Add a hw API based
imx_unregister_hw_clocks when of_clk_add_hw_provider failed.
Reviewed-by: Abel Vesa <abel.vesa@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Switch the imx8m_clk_hw_composite_flags function to clk_hw based API,
rename accordingly and add a macro for clk based legacy. This allows
us to move closer to a clear split between consumer and provider clk
APIs.
Reviewed-by: Abel Vesa <abel.vesa@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Switch the imx_clk_pll14xx function to clk_hw based API, rename
accordingly and add a macro for clk based legacy. This allows us to
move closer to a clear split between consumer and provider clk APIs.
Reviewed-by: Abel Vesa <abel.vesa@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
I was unable to get clk_set_rate() setting a lower RPC-IF clock frequency
and that issue boiled down to me not passing CLK_SET_RATE_PARENT flag to
clk_register_composite() when registering the RPC[D2] clocks...
Fixes: db4a0073cc82 ("clk: renesas: rcar-gen3: Add RPC clocks")
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Link: https://lore.kernel.org/r/be27a344-d8bf-9e0c-8950-2d1b48498496@cogentembedded.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
If devm_clk_get() fails due to probe deferral, we shouldn't print an
error message. Just be silent in this case.
Co-developed-by: Niklas Cassel <niklas.cassel@linaro.org>
Signed-off-by: Niklas Cassel <niklas.cassel@linaro.org>
Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
Link: https://lkml.kernel.org/r/20191125135910.679310-7-niklas.cassel@linaro.org
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
This permits extending the driver to other platforms without having to
modify its source code.
Co-developed-by: Niklas Cassel <niklas.cassel@linaro.org>
Signed-off-by: Niklas Cassel <niklas.cassel@linaro.org>
Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
Link: https://lkml.kernel.org/r/20191125135910.679310-6-niklas.cassel@linaro.org
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
When COMMON_CLK_DISABLED_UNUSED is set, in an effort to save power and
to keep the software model of the clock in line with reality, the
framework transverses the clock tree and disables those clocks that
were enabled by the firmware but have not been enabled by any device
driver.
If CPUFREQ is enabled, early during the system boot, it might attempt
to change the CPU frequency ("set_rate"). If the HFPLL is selected as
a provider, it will then change the rate for this clock.
As boot continues, clk_disable_unused_subtree will run. Since it wont
find a valid counter (enable_count) for a clock that is actually
enabled it will attempt to disable it which will cause the CPU to
stop. Notice that in this driver, calls to check whether the clock is
enabled are routed via the is_enabled callback which queries the
hardware.
The following commit, rather than marking the clock critical and
forcing the clock to be always enabled, addresses the above scenario
making sure the clock is not disabled but it continues to rely on the
firmware to enable the clock.
Co-developed-by: Niklas Cassel <niklas.cassel@linaro.org>
Signed-off-by: Niklas Cassel <niklas.cassel@linaro.org>
Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lkml.kernel.org/r/20191125135910.679310-5-niklas.cassel@linaro.org
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Make the output of the high frequency pll a clock provider.
On the QCS404 this PLL controls cpu frequency scaling.
Co-developed-by: Niklas Cassel <niklas.cassel@linaro.org>
Signed-off-by: Niklas Cassel <niklas.cassel@linaro.org>
Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Acked-by: Stephen Boyd <sboyd@kernel.org>
Link: https://lkml.kernel.org/r/20191125135910.679310-4-niklas.cassel@linaro.org
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
It turns out booting the modem is dependent on a bimc vote from Linux on
msm8998. To make the modem happy, add the bimc clock to rely on the
default vote from rpmcc. Once we have interconnect support, bimc should
be controlled properly.
Fixes: 6131dc81211c ("clk: qcom: smd: Add support for MSM8998 rpm clocks")
Signed-off-by: Jeffrey Hugo <jeffrey.l.hugo@gmail.com>
Link: https://lkml.kernel.org/r/20191217165409.4919-1-jeffrey.l.hugo@gmail.com
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Mark the msm8998 cpu CX gdsc as votable and use the hw control to avoid
corner cases with SMMU per hardware documentation.
Fixes: 3f7df5baa259 ("clk: qcom: Add MSM8998 GPU Clock Controller (GPUCC) driver")
Signed-off-by: Jeffrey Hugo <jeffrey.l.hugo@gmail.com>
Link: https://lkml.kernel.org/r/20191217171905.5619-1-jeffrey.l.hugo@gmail.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Add a driver for the multimedia clock controller found on MSM8998
based devices. This should allow most multimedia device drivers
to probe and control their clocks.
Signed-off-by: Jeffrey Hugo <jhugo@codeaurora.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lkml.kernel.org/r/1576596033-10189-1-git-send-email-jhugo@codeaurora.org
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Commit 17269568f7267 ("clk: qcom: Add Global Clock controller (GCC)
driver for SC7180") sets the VOTABLE flag in .pwrsts, but it needs
to be set in .flags, fix this.
Fixes: 17269568f7267 ("clk: qcom: Add Global Clock controller (GCC) driver for SC7180")
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Link: https://lkml.kernel.org/r/20191204120341.1.I9971817e83ee890d1096c43c5a6ce6ced53d5bd3@changeid
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
gfx3d_clk_src for msm8974 was introduced into the MMCC by
commit d8b212014e69 ("clk: qcom: Add support for MSM8974's multimedia
clock controller (MMCC)") to ensure that all of the clocks for
this platform are documented upstream. This clock actually belongs
on the RPM. Since then, commit 685dc94b7d8f ("clk: qcom: smd-rpmcc:
Add msm8974 clocks") was introduced, which contains the proper
definition for gfx3d_clk_src. Let's drop the definition from the
mmcc and register the clock with the rpm instead.
This change was tested on a Nexus 5 (hammerhead) phone.
Signed-off-by: Brian Masney <masneyb@onstation.org>
Link: https://lkml.kernel.org/r/20191115123931.18919-1-masneyb@onstation.org
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
One of the uses of the external clock outputs is to provide a stable
32768 Hz clock signal to WiFi and Bluetooth chips. On the R40, the RTC
has an internal RC oscillator that is muxed with the external crystal.
Allow setting the parent rate for the external clock outputs so that
requests for 32768 Hz get passed to the RTC's clock driver to mux in
the external crystal if it isn't already muxed correctly.
Fixes: cd030a78f7aa ("clk: sunxi-ng: support R40 SoC")
Fixes: 01a7ea763fc4 ("clk: sunxi-ng: r40: Force LOSC parent to RTC LOSC output")
Cc: <stable@kernel.org>
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
A recent addition exposed a helper that is only used for CONFIG_OF. Move
it into the CONFIG_OF zone in this file to make the compiler stop
warning about an unused function.
Fixes: 66d9506440bb ("clk: walk orphan list on clock provider registration")
Signed-off-by: Olof Johansson <olof@lixom.net>
Link: https://lkml.kernel.org/r/20191217082501.424892072D@mail.kernel.org
[sboyd@kernel.org: "Simply" move the function instead]
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Lockdep warns about a possible circular locking dependency because using
syscon_node_to_regmap() will make the created regmap get and enable the
first clock it can parse from the device tree. This clock is not needed to
access the registers and should not be enabled at that time.
Use the recently introduced device_node_to_regmap to solve that as it looks
up the regmap in the same list but doesn't care about the clocks.
Reported-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lkml.kernel.org/r/20191128102531.817549-1-alexandre.belloni@bootlin.com
Tested-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Some meson pll registers can be initialized with 0 as N value, introducing
the following division by 0 when computing rate :
UBSAN: Undefined behaviour in drivers/clk/meson/clk-pll.c:75:9
division by zero
CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.4.0-rc3-608075-g86c9af8630e1-dirty #400
Call trace:
dump_backtrace+0x0/0x1c0
show_stack+0x14/0x20
dump_stack+0xc4/0x100
ubsan_epilogue+0x14/0x68
__ubsan_handle_divrem_overflow+0x98/0xb8
__pll_params_to_rate+0xdc/0x140
meson_clk_pll_recalc_rate+0x278/0x3a0
__clk_register+0x7c8/0xbb0
devm_clk_hw_register+0x54/0xc0
meson_eeclkc_probe+0xf4/0x1a0
platform_drv_probe+0x54/0xd8
really_probe+0x16c/0x438
driver_probe_device+0xb0/0xf0
device_driver_attach+0x94/0xa0
__driver_attach+0x70/0x108
bus_for_each_dev+0xd8/0x128
driver_attach+0x30/0x40
bus_add_driver+0x1b0/0x2d8
driver_register+0xbc/0x1d0
__platform_driver_register+0x78/0x88
axg_driver_init+0x18/0x20
do_one_initcall+0xc8/0x24c
kernel_init_freeable+0x2b0/0x344
kernel_init+0x10/0x128
ret_from_fork+0x10/0x18
This checks if N is null before doing the division.
Fixes: 7a29a869434e ("clk: meson: Add support for Meson clock controller")
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Remi Pommarel <repk@triplefau.lt>
[jbrunet@baylibre.com: update the comment in above the fix]
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
UART2 peripheral is missing from the regmap fixup table of the g12a family
clock controller. As it is, any access to this clock would Oops, which is
not great.
Add the clock to the table to fix the problem.
Fixes: 085a4ea93d54 ("clk: meson: g12a: add peripheral clock controller")
Reported-by: Dmitry Shmidt <dimitrysh@google.com>
Tested-by: Dmitry Shmidt <dimitrysh@google.com>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Tested-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
CONFIG_ARCH_R8A7796 was renamed to CONFIG_ARCH_R8A77960 in commit
39e57e14d7eaf818 ("soc: renesas: Add ARCH_R8A77960 for existing R-Car
M3-W"), so its users can be removed.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20191211100220.6854-1-geert+renesas@glider.be
- Add missing lock to divider in the composite driver for exclusive
register access.
- Add missing sentinel for ulp_div_table in clk-imx7ulp driver.
- Fix clk_pll14xx_wait_lock() function which calls into
readl_poll_timeout() with incorrect parameter.
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Merge tag 'imx-clk-fixes-5.5' of git://git.kernel.org/pub/scm/linux/kernel/git/shawnguo/linux into clk-fixes
Pull i.MX clk fixes from Shawn Guo:
- Add missing lock to divider in the composite driver for exclusive
register access
- Add missing sentinel for ulp_div_table in clk-imx7ulp driver
- Fix clk_pll14xx_wait_lock() function which calls into
readl_poll_timeout() with incorrect parameter
* tag 'imx-clk-fixes-5.5' of git://git.kernel.org/pub/scm/linux/kernel/git/shawnguo/linux:
clk: imx: pll14xx: fix clk_pll14xx_wait_lock
clk: imx: clk-imx7ulp: Add missing sentinel of ulp_div_table
clk: imx: clk-composite-8m: add lock to gate/mux
So far, we walked the orphan list every time a new clock was registered
in CCF. This was fine since the clocks were only referenced by name.
Now that the clock can be referenced through DT, it is not enough:
* Controller A register first a reference clocks from controller B
through DT.
* Controller B register all its clocks then register the provider.
Each time controller B registers a new clock, the orphan list is walked
but it can't match since the provider is registered yet. When the
provider is finally registered, the orphan list is not walked unless
another clock is registered afterward.
This can lead to situation where some clocks remain orphaned even if
the parent is available.
Walking the orphan list on provider registration solves the problem.
Reported-by: Jian Hu <jian.hu@amlogic.com>
Fixes: fc0c209c147f ("clk: Allow parents to be specified without string names")
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Link: https://lkml.kernel.org/r/20191203080805.104628-1-jbrunet@baylibre.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Switch from clk_hw_register to of_clk_hw_register so we can use
clk_parent_data.fw_name. This will be used to get the "xtal", "ddr_pll"
and possibly others from the .dtb.
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
The XTAL clock is an actual crystal on the PCB. Thus the meson8b clock
driver should not register the XTAL clock - instead it should be
provided via .dts and then passed to the clock controller.
Skip the registration of the XTAL clock if a parent clock is provided
via OF. Fall back to registering the XTAL clock if this is not the case
to keep support for old .dtbs.
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
The XTAL clock is an actual crystal which is mounted on the PCB. Thus
the meson8b clock controller driver should not provide the XTAL clock.
The meson8b clock controller driver must not use references to
the meson8b_xtal clock anymore before we can provide the XTAL clock
via OF. Replace the references to the meson8b_xtal.hw by using
clk_parent_data's .fw_name and .name = "xtal" (along with index = -1).
This makes the common clock framework use the clock provided via OF and
if that's not available it falls back to getting the clock by it's name
(which is then the clk_fixed_rate which we register in our driver).
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Switch from clk_set_parent() to clk_hw_set_parent() now that we have a
way to configure a mux clock based on clk_hw pointers. This simplifies
the meson8b_cpu_clk_notifier_cb logic. No functional changes.
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
The Meson8/Meson8b/Meson8m2 SoCs embed a DDR clock controller in the
MMCBUS registers. There is no public documentation, but the u-boot GPL
sources from the Amlogic BSP show that the DDR clock controller is
identical on all three SoCs:
#define CFG_DDR_CLK 792
#define CFG_PLL_M (((CFG_DDR_CLK/12)*12)/24)
#define CFG_PLL_N 1
#define CFG_PLL_OD 1
// from set_ddr_clock:
t_ddr_pll_cntl= (CFG_PLL_OD << 16)|(CFG_PLL_N<<9)|(CFG_PLL_M<<0)
writel(timing_reg->t_ddr_pll_cntl|(1<<29),AM_DDR_PLL_CNTL);
writel(readl(AM_DDR_PLL_CNTL) & (~(1<<29)),AM_DDR_PLL_CNTL);
// from hx_ddr_power_down_enter: shut down DDR PLL
writel(readl(AM_DDR_PLL_CNTL)|(1<<30),AM_DDR_PLL_CNTL);
do { ... } while((readl(AM_DDR_PLL_CNTL)&(1<<31))==0)
This translates to:
- AM_DDR_PLL_CNTL[29] is the reset bit
- AM_DDR_PLL_CNTL[30] is the enable bit
- AM_DDR_PLL_CNTL[31] is the lock bit
- AM_DDR_PLL_CNTL[8:0] is the m value (assuming the width is 9 bits
based on the start of the n value)
- AM_DDR_PLL_CNTL[13:9] is the n value (assuming the width is 5 bits
based on the start of the od)
- AM_DDR_PLL_CNTL[17:16] is the od (assuming the width is 2 bits based
on other PLLs on this SoC)
Add a driver for this PLL setup because it's used as one of the inputs
of the audio clocks. There may be more clocks inside that clock
controller - those can be added in subsequent patches.
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
This is just to keep in line with the other i.MX clock drivers that are
clk_hw based. Plus, it makes more sense to be called hws since its type is
clk_hw not clk.
Signed-off-by: Abel Vesa <abel.vesa@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Renaming the imx_clk_divider_gate register function to imx_clk_hw_divider_gate
to be more obvious it is clk_hw based.
Signed-off-by: Abel Vesa <abel.vesa@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Renaming the imx_clk_pfdv2 register function to imx_clk_hw_pfdv2 to be
more obvious it is clk_hw based.
Signed-off-by: Abel Vesa <abel.vesa@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Renaming the imx_clk_pllv4 register function to imx_clk_hw_pllv4 to be
more obvious it is clk_hw based.
Signed-off-by: Abel Vesa <abel.vesa@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Renaming the imx_clk_frac_pll and imx_clk_sccg_pll register functions to
imx_clk_hw_frac_pll, respectively imx_clk_hw_sccg_pll to be more obvious
that they are clk_hw based.
Signed-off-by: Abel Vesa <abel.vesa@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Renaming the imx7ulp_clk_composite register function to
imx7ulp_clk_hw_composite to show it is clk_hw based.
Signed-off-by: Abel Vesa <abel.vesa@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
