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If the mmc clock has no rate, it can be assumed to be constant.
In such case, there is no measurable phase shift. Just return 0
in this case instead of returning an error.
Fixes: 2760878662a2 ("clk: Bail out when calculating phase fails during clk registration")
Tested-by: Markus Reichl <m.reichl@fivetechno.de>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Link: https://lkml.kernel.org/r/20200303192956.64410-1-jbrunet@baylibre.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux
Pull clk updates from Stephen Boyd:
"This round of clk driver and framework updates is heavy on the driver
update side. The two main highlights in the core framework are the
addition of an bulk clk_get API that handles optional clks and an
extra debugfs file that tells the developer about the current parent
of a clk.
The driver updates are dominated by i.MX in the diffstat, but that is
mostly because that SoC has started converting to the clk_hw style of
clk registration. The next big update is in the Amlogic meson clk
driver that gained some support for audio, cpu, and temperature clks
while fixing some PLL issues. Finally, the biggest thing that stands
out is the conversion of a large part of the Allwinner sunxi-ng driver
to the new clk parent scheme that uses less strings and more pointer
comparisons to match clk parents and children up.
In general, it looks like we have a lot of little fixes and tweaks
here and there to clk data along with the normal addition of a handful
of new drivers and a couple new core framework features.
Core:
- Add a 'clk_parent' file in clk debugfs
- Add a clk_bulk_get_optional() API (with devm too)
New Drivers:
- Support gated clk controller on MIPS based BCM63XX SoCs
- Support SiLabs Si5341 and Si5340 chips
- Support for CPU clks on Raspberry Pi devices
- Audsys clock driver for MediaTek MT8516 SoCs
Updates:
- Convert a large portion of the Allwinner sunxi-ng driver to new clk parent scheme
- Small frequency support for SiLabs Si544 chips
- Slow clk support for AT91 SAM9X60 SoCs
- Remove dead code in various clk drivers (-Wunused)
- Support for Marvell 98DX1135 SoCs
- Get duty cycle of generic pwm clks
- Improvement in mmc phase calculation and cleanup of some rate defintions
- Switch i.MX6 and i.MX7 clock drivers to clk_hw based APIs
- Add GPIO, SNVS and GIC clocks for i.MX8 drivers
- Mark imx6sx/ul/ull/sll MMDC_P1_IPG and imx8mm DRAM_APB as critical clock
- Correct imx7ulp nic1_bus_clk and imx8mm audio_pll2_clk clock setting
- Add clks for new Exynos5422 Dynamic Memory Controller driver
- Clock definition for Exynos4412 Mali
- Add CMM (Color Management Module) clocks on Renesas R-Car H3, M3-N, E3, and D3
- Add TPU (Timer Pulse Unit / PWM) clocks on Renesas RZ/G2M
- Support for 32 bit clock IDs in TI's sci-clks for J721e SoCs
- TI clock probing done from DT by default instead of firmware
- Fix Amlogic Meson mpll fractional part and spread sprectrum issues
- Add Amlogic meson8 audio clocks
- Add Amlogic g12a temperature sensors clocks
- Add Amlogic g12a and g12b cpu clocks
- Add TPU (Timer Pulse Unit / PWM) clocks on Renesas R-Car H3, M3-W, and M3-N
- Add CMM (Color Management Module) clocks on Renesas R-Car M3-W
- Add Clock Domain support on Renesas RZ/N1"
* tag 'clk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux: (190 commits)
clk: consoldiate the __clk_get_hw() declarations
clk: sprd: Add check for return value of sprd_clk_regmap_init()
clk: lochnagar: Update DT binding doc to include the primary SPDIF MCLK
clk: Add Si5341/Si5340 driver
dt-bindings: clock: Add silabs,si5341
clk: clk-si544: Implement small frequency change support
clk: add BCM63XX gated clock controller driver
devicetree: document the BCM63XX gated clock bindings
clk: at91: sckc: use dedicated functions to unregister clock
clk: at91: sckc: improve error path for sama5d4 sck registration
clk: at91: sckc: remove unnecessary line
clk: at91: sckc: improve error path for sam9x5 sck register
clk: at91: sckc: add support to free slow clock osclillator
clk: at91: sckc: add support to free slow rc oscillator
clk: at91: sckc: add support to free slow oscillator
clk: rockchip: export HDMIPHY clock on rk3228
clk: rockchip: add watchdog pclk on rk3328
clk: rockchip: add clock id for hdmi_phy special clock on rk3228
clk: rockchip: add clock id for watchdog pclk on rk3328
clk: at91: sckc: add support for SAM9X60
...
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Based on 3 normalized pattern(s):
this program is free software you can redistribute it and or modify
it under the terms of the gnu general public license as published by
the free software foundation either version 2 of the license or at
your option any later version this program is distributed in the
hope that it will be useful but without any warranty without even
the implied warranty of merchantability or fitness for a particular
purpose see the gnu general public license for more details
this program is free software you can redistribute it and or modify
it under the terms of the gnu general public license as published by
the free software foundation either version 2 of the license or at
your option any later version [author] [kishon] [vijay] [abraham]
[i] [kishon]@[ti] [com] this program is distributed in the hope that
it will be useful but without any warranty without even the implied
warranty of merchantability or fitness for a particular purpose see
the gnu general public license for more details
this program is free software you can redistribute it and or modify
it under the terms of the gnu general public license as published by
the free software foundation either version 2 of the license or at
your option any later version [author] [graeme] [gregory]
[gg]@[slimlogic] [co] [uk] [author] [kishon] [vijay] [abraham] [i]
[kishon]@[ti] [com] [based] [on] [twl6030]_[usb] [c] [author] [hema]
[hk] [hemahk]@[ti] [com] this program is distributed in the hope
that it will be useful but without any warranty without even the
implied warranty of merchantability or fitness for a particular
purpose see the gnu general public license for more details
extracted by the scancode license scanner the SPDX license identifier
GPL-2.0-or-later
has been chosen to replace the boilerplate/reference in 1105 file(s).
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.202006027@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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There's a bit of math in rockchip_mmc_get_phase() to calculate the
"fine delay". This math boils down to:
PSECS_PER_SEC = 1000000000000.
ROCKCHIP_MMC_DELAY_ELEMENT_PSEC = 60
card_clk * ROCKCHIP_MMC_DELAY_ELEMENT_PSEC * 360 * x / PSECS_PER_SEC
...but we do it in pieces to avoid overflowing 32-bits. Right now we
overdo it a little bit, though, and end up getting less accurate math
than we could. Right now we do:
DIV_ROUND_CLOSEST((card_clk / 1000000) *
(ROCKCHIP_MMC_DELAY_ELEMENT_PSEC / 10) *
(360 / 10) *
delay_num,
PSECS_PER_SEC / 1000000 / 10 / 10)
This is non-ideal because:
A) The pins on Rockchip SoCs are rated to go at most 150 MHz, so the
max card clock is 150 MHz. Even ignoring this the maximum SD card
clock (for SDR104) would be 208 MHz. This means you can decrease
your division by 100x and still not overflow:
hex(208000000 / 10000 * 6 * 36 * 0xff) == 0x44497200
B) On many Rockchip SoCs we end up with a card clock that is actually
148500000 because we parent off the 297 MHz PLL. That means the
math we're actually doing today is less than ideal. Specifically:
148500000 / 1000000 = 148
Let's fix the math to be slightly more accurate.
NOTE: no known problems are fixed by this. It was found simply by
code inspection. If you want to see the difference between the old
and the new on a 148.5 MHz clock, this python can help:
old = [x for x in
(int(round(148 * 6 * 36 * x / 10000.)) for x in range(256))
if x < 90]
new = [x for x in
(int(round(1485 * 6 * 36 * x / 100000.)) for x in range(256))
if x < 90]
The only differences are:
delay_num=17 54=>55
delay_num=22 70=>71
delay_num=27 86=>87
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
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At boot time, my rk3288-veyron devices yell with 8 lines that look
like this:
[ 0.000000] rockchip_mmc_get_phase: invalid clk rate
This is because the clock framework at clk_register() time tries to
get the phase but we don't have a parent yet.
While the errors appear to be harmless they are still ugly and, in
general, we don't want yells like this in the log unless they are
important.
There's no real reason to be yelling here. We can still return
-EINVAL to indicate that the phase makes no sense without a parent.
If someone really tries to do tuning and the clock is reported as 0
then we'll see the yells in rockchip_mmc_set_phase().
Fixes: 4bf59902b500 ("clk: rockchip: Prevent calculating mmc phase if clock rate is zero")
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
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When calculating the MMC phase we can just use clk_hw_get_rate()
instead of clk_get_rate(). This avoids recalculating the rate.
Suggested-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
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The newly added clock notifier may return an error code but so far the
error output in the function would only return an error pointer from
registering the clock.
So when the clock notifier fails the clock would be unregistered but the
return would still be the clock pointer which could then not be
dereferenced correctly. So fix the error handling to prevent that.
Fixes: 60cf09e45fbc ("clk: rockchip: Restore the clock phase after the rate was changed")
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
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We can't restore every phase, for instance the invalid phase and
the phase for coming rate which is out of the scope of boards'
ability. And this patch also corrects the error path to return
invalid pointer to clk if clk_notifier_register failed introduced
by the same offending commit.
Fixes: 60cf09e45fbc ("clk: rockchip: Restore the clock phase after the rate was changed")
Reported-by: wlq <wlq@rock-chips.com>
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Tested-by: wlq <wlq@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
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There are many factors affecting the clock phase, including clock
rate, temperature, logic voltage and silicon process, etc. But clock
rate is the most significant one here, and the driver should be aware
of the change of the clock rate. As mmc controller need a fixed phase
after tuning was completed, at least before explicitly doing re-tune,
so this patch try to restore the clock phase by monitoring the event
of rate change.
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
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The MMC sample and drv clock for rockchip platforms are derived from
the bus clock output to the MMC/SDIO card. So it should never happens
that the clk rate is zero given it should inherits the clock rate from
its parent. If something goes wrong and makes the clock rate to be zero,
the calculation would be wrong but may still make the mmc tuning process
work luckily. However it makes people harder to debug when the following
data transfer is unstable.
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
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initialization"
This reverts commit 7a03fe6f48f3 ("clk: rockchip: reset init state
before mmc card initialization").
Though not totally obvious from the commit message nor from the source
code, that commit appears to be trying to reset the "_drv" MMC clocks to
90 degrees (note that the "_sample" MMC clocks have a shift of 0 so are
not touched).
The major problem here is that it doesn't properly reset things. The
phase is a two bit field and the commit only touches one of the two
bits. Thus the commit had the following affect:
- phase 0 => phase 90
- phase 90 => phase 90
- phase 180 => phase 270
- phase 270 => phase 270
Things get even weirder if you happen to have a bootloader that was
actually using delay elements (should be no reason to, but you never
know), since those are additional bits that weren't touched by the
original patch.
This is unlikely to be what we actually want. Checking on rk3288-veyron
devices, I can see that the bootloader leaves these clocks as:
- emmc: phase 180
- sdmmc: phase 90
- sdio0: phase 90
Thus on rk3288-veyron devices the commit we're reverting had the effect
of changing the eMMC clock to phase 270. This probably explains the
scattered reports I've heard of eMMC devices not working on some veyron
devices when using the upstream kernel.
The original commit was presumably made because previously the kernel
didn't touch the "_drv" phase at all and relied on whatever value was
there when the kernel started. If someone was using a bootloader that
touched the "_drv" phase then, indeed, we should have code in the kernel
to fix that. ...and also, to get ideal timings, we should also have the
kernel change the phase depending on the speed mode. In fact, that's
the subject of a recent patch I posted at
<https://patchwork.kernel.org/patch/9075141/>.
Ideally, we should take both the patch posted to dw_mmc and this
revert. Since those will likely go through different trees, here I
describe behavior with the combos:
1. Just this revert: likely will fix rk3288-veyron eMMC on some devices
+ other cases; might break someone with a strange bootloader that
sets the phase to 0 or one that uses delay elements (pretty
unpredicable what would happen in that case).
2. Just dw_mmc patch: fixes everyone. Effectly the dw_mmc patch will
totally override the broken patch and fix everything.
3. Both patches: fixes everyone. Once dw_mmc is initting properly then
any defaults from the clock code doesn't mattery.
Fixes: 7a03fe6f48f3 ("clk: rockchip: reset init state before mmc card initialization")
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com>
[emmc and sdmmc still work on all current boards in mainline after this
revert, so they should take precedence over any out-of-tree board that
will hopefully again get fixed with the better upcoming dw_mmc change.]
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
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The flags element of clk_init_data was never initialized for mmc-
phase-clocks resulting in the element containing a random value
and thus possibly enabling unwanted clock flags.
Fixes: 89bf26cbc1a0 ("clk: rockchip: Add support for the mmc clock phases using the framework")
Cc: stable@vger.kernel.org
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
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We seem to have accumulated a bunch of checkpatch warnings, with mainly
overlong lines and two unnecessary allocation error messages.
Most were introduced with the recent multi-controller-support but some
were quite a bit older.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
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Avoid return NULL if rockchip_clk_register_mmc fails, otherwise
rockchip_clk_register_branches print "unknown clock type". The acutal
case is that it's a known clock type but we fail to regiser it, which
may makes user confuse the reason of failure.
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
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git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux
Pull clk updates from Stephen Boyd:
"The majority of the changes are driver updates and new device support.
The core framework is mostly unchanged this time around, with only a
couple patches to expose a clk provider API and make getting clk
parent names from DT more robust.
Driver updates:
- Support for clock controllers found on Broadcom Northstar SoCs and
bcm2835 SoC
- Support for Allwinner audio clocks
- A few cleanup patches for Tegra drivers and support for the highest
DFLL frequencies on Tegra124
- Samsung exynos7 fixes and improvements
- i.Mx SoC updates to add a few missing clocks and keep debug uart
clocks on during kernel intialization
- Some mediatek cleanups and support for more subsystem clocks
- Support for msm8916 gpu/audio clocks and qcom's GDSC power domain
controllers
- A new driver for the Silabs si514 clock chip"
* tag 'clk-for-linus-20151104' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux: (143 commits)
clk: qcom: msm8960: Fix dsi1/2 halt bits
clk: lpc18xx-cgu: fix potential system hang when disabling unused clocks
clk: lpc18xx-ccu: fix potential system hang when disabling unused clocks
clk: Add clk_hw_is_enabled() for use by clk providers
clk: Add stubs for of_clk_*() APIs when CONFIG_OF=n
clk: versatile-icst: fix memory leak
clk: Remove clk_{register,unregister}_multiplier()
clk: iproc: define Broadcom NS2 iProc clock binding
clk: iproc: define Broadcom NSP iProc clock binding
clk: ns2: add clock support for Broadcom Northstar 2 SoC
clk: iproc: Separate status and control variables
clk: iproc: Split off dig_filter
clk: iproc: Add PLL base write function
clk: nsp: add clock support for Broadcom Northstar Plus SoC
clk: iproc: Add PWRCTRL support
clk: cygnus: Convert all macros to all caps
ARM: cygnus: fix link failures when CONFIG_COMMON_CLK_IPROC is disabled
clk: imx31: add missing of_node_put
clk: imx27: add missing of_node_put
clk: si5351: add missing of_node_put
...
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Let's use DIV_ROUND_CLOSEST for rounding, not just truncating
division. This lets us get closer to the right rate.
Before this:
set_phase(86) delay_nums=26 reg[0xf000420c]=0x468 actual_degrees=83
set_phase(89) delay_nums=27 reg[0xf000420c]=0x46c actual_degrees=86
After this:
set_phase(86) delay_nums=27 reg[0xf000420c]=0x46c actual_degrees=86
set_phase(89) delay_nums=28 reg[0xf000420c]=0x470 actual_degrees=90
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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Because of the inexact nature of the extra MMC delay elements (it's
not possible to keep the phase monotonic and to also make phases (mod
90) > 70), we previously only allowed phases (mod 90) of 22.5, 45,
and 67.5.
But it's not the end of the world if the MMC clock phase goes
non-monotonic. At most we'll be 25 degrees off. It's way better to
test more phases to look for bad ones than to be 25 degrees off, because
in the case of MMC really the point is to find bad phases and get as far
asway from the as possible. If we get to test extra phases by going
slightly non-monotonic then that might be fine. Worst case we would
end up at a phases that's slight differnt than the one we wanted, but
at least we'd still be quite far away from the a bad phase.
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Fold in more precise variance-values of 44-77 instead of 40-80.
Fold in the actual removal of the monotonic requirement and adapt
patch message accordingly.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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mmc host controller's IO input/output timing is unpredictable if
bootloader execute tuning for HS200 mode. It might make kernel failed
to initialize mmc card in identification mode. The root cause is
tuning phase and degree setting for HS200 mode in bootloader aren't
applicable to that of identification mode in kernel stage. Anyway, we
can't force all bootloaders to reset tuning phase and degree setting
before into kernel. Simply reset it in rockchip_clk_register_mmc.
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
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Use the provider based method to get a clock's name so that we
can get rid of the clk member in struct clk_hw one day. Mostly
converted with the following coccinelle script.
@@
struct clk_hw *E;
@@
-__clk_get_name(E->clk)
+clk_hw_get_name(E)
Acked-by: Heiko Stuebner <heiko@sntech.de>
Cc: Sylwester Nawrocki <s.nawrocki@samsung.com>
Cc: Tomasz Figa <tomasz.figa@gmail.com>
Cc: Peter De Schrijver <pdeschrijver@nvidia.com>
Cc: Prashant Gaikwad <pgaikwad@nvidia.com>
Cc: Stephen Warren <swarren@wwwdotorg.org>
Acked-by: Thierry Reding <treding@nvidia.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Alexandre Courbot <gnurou@gmail.com>
Cc: Tero Kristo <t-kristo@ti.com>
Cc: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Acked-by: Andrew Bresticker <abrestic@chromium.org>
Cc: Ezequiel Garcia <ezequiel.garcia@imgtec.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Kevin Cernekee <cernekee@chromium.org>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Ulrich Hecht <ulrich.hecht+renesas@gmail.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-rockchip@lists.infradead.org
Cc: linux-samsung-soc@vger.kernel.org
Cc: linux-tegra@vger.kernel.org
Cc: linux-omap@vger.kernel.org
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
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* cleanup-clk-h-includes: (62 commits)
clk: Remove clk.h from clk-provider.h
clk: h8300: Remove clk.h and clkdev.h includes
clk: at91: Include clk.h and slab.h
clk: ti: Switch clk-provider.h include to clk.h
clk: pistachio: Include clk.h
clk: ingenic: Include clk.h
clk: si570: Include clk.h
clk: moxart: Include clk.h
clk: cdce925: Include clk.h
clk: Include clk.h in clk.c
clk: zynq: Include clk.h
clk: ti: Include clk.h
clk: sunxi: Include clk.h and remove unused clkdev.h includes
clk: st: Include clk.h
clk: qcom: Include clk.h
clk: highbank: Include clk.h
clk: bcm: Include clk.h
clk: versatile: Remove clk.h and clkdev.h includes
clk: ux500: Remove clk.h and clkdev.h includes
clk: tegra: Properly include clk.h
...
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Clock provider drivers generally shouldn't include clk.h because
it's the consumer API. Only include clk.h if it's actually used.
Cc: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
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The review for the new inverter clock type uncovered some issues (missing
headers and name handling) that are also present in the mmc-phase clock
type, I got (to much) inspiration from. Fix these there too.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
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Since commit 2893c379461a ("clk: make strings in parent name arrays
const") the name of parent clocks can be const. So add more const in
several clock drivers.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
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This patch adds the 2 physical clocks for the mmc (drive and sample). They're
mostly there for the phase properties, but they also show the true clock
(by dividing by RK3288_MMC_CLKGEN_DIV).
The drive and sample phases are generated by dividing an upstream parent clock
by 2, this allows us to adjust the phase by 90 deg.
There's also an option to have up to 255 delay elements (40-80 picoseconds long).
This driver uses those elements (under the assumption that they're 60 ps long)
to generate approximate 22.5 degrees options. 67.5 (22.5*3) might be as high as
90 deg if the delay elements are as big as 80 ps, so a finer division (smaller
than 22.5) was not picked because the phase might not be monotonic anymore.
Suggested-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Alexandru M Stan <amstan@chromium.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
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