[PATCH v11 00/27] ARM: davinci: convert to common clock frameworkâ

From: David Lechner
Date: Fri May 18 2018 - 12:01:14 EST

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This series converts mach-davinci to use the common clock framework.

The series works like this, the first 3 patches fix some issues with the clock
drivers that have already been accepted into the mainline kernel.

Then, starting with "ARM: davinci: pass clock as parameter to
davinci_timer_init()", we get the mach code ready for the switch by adding the
code needed for the new clock drivers and adding #ifndef CONFIG_COMMON_CLK
around the legacy clocks so that we can switch easily between the old and the
new.

"ARM: davinci: switch to common clock framework" actually flips the switch
to start using the new clock drivers. Then the next 8 patches remove all
of the old clock code.

The final four patches add device tree clock support to the one SoC that
supports it.

This series has been tested on TI OMAP-L138 LCDK (both device tree and legacy
board file).

Changes:

v11 changes (also see individual patches for details):
- Proper unwinding on error in clk patches
- Dropped ref_clk fallback in device tree timer patch
- Fix W=1 and sparse warnings

v10 changes (also see individual patches for details):
- Reworked device tree bindings for DaVinci timer.
- Dropped helper functions to conditionally call devm_* versions of functions
- Fix some typos
- Fix some rebasing issues introduced in v9

v9 changes (also see individual patches for details):
- Rebased on linux-davnci/master (f5e3203bb775)
- Dropped drivers/clk patches that landed in v4.17
- New drivers/clk patches for early boot special case
- New patch for ti,davinci-timer device tree bindings
- Updated mach/davinci patches to register clocks in early boot when needed

v8 changes (also see individual patches for details):
- Rebased on linux-davinci/master
- Dropped use of __init and __initconst attributes in clk drivers
- Add clkdev lookups for PLL SYSCLKs
- Fix genpd clock reference counting issue
- Fix PSC clock driver loading order issue
- Fix typo in device tree and add more power-domains properties

v7 changes (also see individual patches for details):
- Rebased on linux-davinci/master (v4.16-rc)
- Convert clock drivers to platform devices
- New patch "ARM: davinci: pass clock as parameter to davinci_timer_init()"
- Fix issues with lcdk and aemif clock lookups and power domains
- Fixed other minor issues brought up in v6 review

v6 changes (also see individual patches for details):
- All of the device tree bindings are changed
- All of the clock drivers are changed significantly
- Fixed issues brought up during review of v5
- "ARM: davinci: move davinci_clk_init() to init_time" is removed from this
series and submitted separately

v5 changes:
- Basically, this is an entirely new series
- Patches are broken up into bite-sized pieces
- Converted PSC clock driver to use regmap
- Restored "force" flag for certain DA850 clocks
- Added device tree bindings
- Moved more of the clock init to drivers/clk
- Fixed frequency scaling (maybe*)

* I have frequency scaling using cpufreq-dt, so I know the clocks are doing
what they need to do to make this work, but I haven't figured out how to
test davinci-cpufreq driver yet. (Patches to make cpufreq-dt work will be
sent separately after this series has landed.)

Dependencies:

There are still some outstanding fixes to get everything working correctly.
For the most part, these are just runtime dependencies and only needed for
certain platforms.

Of the clk patches, only "clk: davinci: psc-da830: fix USB0 48MHz PHY clock
registration" has been picked up in clk-next so far. Theoretically, there has
been a pull request made for "drm/tilcdc: Fix setting clock divider for
omap-l138", but I haven't seen it land anywhere yet. The series "remoteproc/
davinci: common clock framework related fixes" is in rproc-next already.

- "drm/tilcdc: Fix setting clock divider for omap-l138"[1]
- "clk: davinci: pll-dm355: fix SYSCLKn parent names"[2]
- "remoteproc/davinci: common clock framework related fixes"[3]
- "clk: davinci: psc-da830: fix USB0 48MHz PHY clock registration"[4]
- "clk: davinci: some more fixes"[5]
- "clk: davinci: psc-dm355: fix ASP0/1 clkdev lookups"[6]

[1]: https://patchwork.freedesktop.org/patch/210696/
[2]: https://lkml.org/lkml/2018/5/9/626
[3]: https://lkml.org/lkml/2018/5/2/201
[4]: https://git.kernel.org/pub/scm/linux/kernel/git/clk/linux.git/commit/?h=clk-davinci-psc-da830&id=a714dceb721407c2a5d2887938f37e34ed00669c
[5]: https://www.spinics.net/lists/arm-kernel/msg652656.html
[6]: https://patchwork.kernel.org/patch/10395979/

You can find a working branch with everything included (plus a few extras, like
cpufreq-dt) in the "common-clk-v11" branch of https://github.com/dlech/ev3dev-kernel.git.

Testing/debugging for the uninitiated:

I only have one device to test with, which is based on da850, so I will
have to rely on others to do some testing here. Since we are dealing with
clocks, if something isn't working, you most likely won't see output on
the serial port. To figure out what is going on, you need to enable...

CONFIG_DEBUG_LL=y
CONFIG_EARLY_PRINTK=y

and add "earlyprintk clk_ignore_unused" to the kernel command line options.
You may need to select a different UART for this depending on your board. I
think UART1 is the default in the kernel configuration.

On da850 devices comment out the lines:

/* pll1_sysclk2 is not affected by CPU scaling, so use it for async3 */
parent = clk_hw_get_parent_by_index(&mux->hw, 1);
if (parent)
clk_set_parent(mux->hw.clk, parent->clk);
else
dev_warn(dev, "Failed to find async3 parent clock\n");

in da8xx-cfgchip.c or, if using device tree, comment out the lines:

assigned-clocks = <&async3_clk>;
assigned-clock-parents = <&pll1_sysclk 2>;

in da850.dtsi when doing earlyprintk, otherwise the UART1 and UART2 clock
source will change during boot and cause garbled output after a point.

David Lechner (27):
clk: davinci: pll: allow dev == NULL
clk: davinci: da850-pll: change PLL0 to CLK_OF_DECLARE
clk: davinci: psc: allow for dev == NULL
ARM: davinci: pass clock as parameter to davinci_timer_init()
ARM: davinci: da830: add new clock init using common clock framework
ARM: davinci: da850: add new clock init using common clock framework
ARM: davinci: dm355: add new clock init using common clock framework
ARM: davinci: dm365: add new clock init using common clock framework
ARM: davinci: dm644x: add new clock init using common clock framework
ARM: davinci: dm646x: add new clock init using common clock framework
ARM: davinci: da8xx: add new USB PHY clock init using common clock
framework
ARM: davinci: da8xx: add new sata_refclk init using common clock
framework
ARM: davinci: remove CONFIG_DAVINCI_RESET_CLOCKS
ARM: davinci_all_defconfig: remove CONFIG_DAVINCI_RESET_CLOCKS
ARM: davinci: switch to common clock framework
ARM: davinci: da830: Remove legacy clock init
ARM: davinci: da850: Remove legacy clock init
ARM: davinci: dm355: Remove legacy clock init
ARM: davinci: dm365: Remove legacy clock init
ARM: davinci: dm644x: Remove legacy clock init
ARM: davinci: dm646x: Remove legacy clock init
ARM: davinci: da8xx: Remove legacy USB and SATA clock init
ARM: davinci: remove legacy clocks
dt-bindings: timer: new bindings for TI DaVinci timer
ARM: davinci: add device tree support to timer
ARM: davinci: da8xx-dt: switch to device tree clocks
ARM: dts: da850: Add clocks

.../bindings/timer/ti,davinci-timer.txt | 37 +
arch/arm/Kconfig | 5 +-
arch/arm/boot/dts/da850-enbw-cmc.dts | 4 +
arch/arm/boot/dts/da850-evm.dts | 4 +
arch/arm/boot/dts/da850-lcdk.dts | 9 +
arch/arm/boot/dts/da850-lego-ev3.dts | 4 +
arch/arm/boot/dts/da850.dtsi | 168 ++++
arch/arm/configs/davinci_all_defconfig | 1 -
arch/arm/mach-davinci/Kconfig | 13 +-
arch/arm/mach-davinci/Makefile | 4 +-
arch/arm/mach-davinci/board-da830-evm.c | 12 +-
arch/arm/mach-davinci/board-da850-evm.c | 2 +
arch/arm/mach-davinci/board-dm355-evm.c | 2 +
arch/arm/mach-davinci/board-dm355-leopard.c | 2 +
arch/arm/mach-davinci/board-dm365-evm.c | 2 +
arch/arm/mach-davinci/board-dm644x-evm.c | 2 +
arch/arm/mach-davinci/board-dm646x-evm.c | 2 +
arch/arm/mach-davinci/board-mityomapl138.c | 2 +
arch/arm/mach-davinci/board-neuros-osd2.c | 2 +
arch/arm/mach-davinci/board-omapl138-hawk.c | 11 +-
arch/arm/mach-davinci/board-sffsdr.c | 2 +
arch/arm/mach-davinci/clock.c | 745 -----------------
arch/arm/mach-davinci/clock.h | 76 --
arch/arm/mach-davinci/common.c | 3 -
arch/arm/mach-davinci/da830.c | 462 ++---------
arch/arm/mach-davinci/da850.c | 778 +++---------------
arch/arm/mach-davinci/da8xx-dt.c | 66 --
arch/arm/mach-davinci/davinci.h | 8 +
arch/arm/mach-davinci/devices-da8xx.c | 43 +-
arch/arm/mach-davinci/devices.c | 1 -
arch/arm/mach-davinci/dm355.c | 406 ++-------
arch/arm/mach-davinci/dm365.c | 485 +----------
arch/arm/mach-davinci/dm644x.c | 344 +-------
arch/arm/mach-davinci/dm646x.c | 372 +--------
arch/arm/mach-davinci/include/mach/clock.h | 3 -
arch/arm/mach-davinci/include/mach/common.h | 11 +-
arch/arm/mach-davinci/include/mach/da8xx.h | 6 +-
arch/arm/mach-davinci/pm_domain.c | 5 +
arch/arm/mach-davinci/psc.c | 137 ---
arch/arm/mach-davinci/psc.h | 12 -
arch/arm/mach-davinci/time.c | 22 +-
arch/arm/mach-davinci/usb-da8xx.c | 242 +-----
drivers/clk/davinci/pll-da830.c | 5 +-
drivers/clk/davinci/pll-da850.c | 37 +-
drivers/clk/davinci/pll-dm355.c | 9 +-
drivers/clk/davinci/pll-dm365.c | 9 +-
drivers/clk/davinci/pll-dm644x.c | 9 +-
drivers/clk/davinci/pll-dm646x.c | 9 +-
drivers/clk/davinci/pll.c | 279 +++++--
drivers/clk/davinci/pll.h | 30 +-
drivers/clk/davinci/psc-dm355.c | 3 +-
drivers/clk/davinci/psc-dm365.c | 3 +-
drivers/clk/davinci/psc-dm644x.c | 3 +-
drivers/clk/davinci/psc-dm646x.c | 3 +-
drivers/clk/davinci/psc.c | 58 +-
include/linux/clk/davinci.h | 29 +
56 files changed, 1005 insertions(+), 3998 deletions(-)
create mode 100644 Documentation/devicetree/bindings/timer/ti,davinci-timer.txt
delete mode 100644 arch/arm/mach-davinci/clock.c
delete mode 100644 arch/arm/mach-davinci/psc.c
create mode 100644 include/linux/clk/davinci.h

--
2.17.0

Next message: David Lechner: "[PATCH v11 09/27] ARM: davinci: dm644x: add new clock init using common clock framework"
Previous message: Linus Torvalds: "Re: [PATCH v2 01/26] rculist: introduce list_next_or_null_rr_rcu()"
Next in thread: David Lechner: "[PATCH v11 01/27] clk: davinci: pll: allow dev == NULL"
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