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Message-ID: <CAHCN7xJ6+vmyrTQGYH=pKz5GRf7rLT4otreNgu6TJi_3UAEX5w@mail.gmail.com>
Date: Sun, 13 May 2018 19:40:49 -0500
From: Adam Ford <aford173@...il.com>
To: David Lechner <david@...hnology.com>
Cc: linux-clk@...r.kernel.org, devicetree <devicetree@...r.kernel.org>,
arm-soc <linux-arm-kernel@...ts.infradead.org>,
Michael Turquette <mturquette@...libre.com>,
Stephen Boyd <sboyd@...eaurora.org>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Sekhar Nori <nsekhar@...com>,
Kevin Hilman <khilman@...nel.org>,
Bartosz Golaszewski <bgolaszewski@...libre.com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v10 00/27] ARM: davinci: convert to common clock framework
On Wed, May 9, 2018 at 12:25 PM, David Lechner <david@...hnology.com> wrote:
> 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).
>
I am not sure if I did something wrong, but I attempted to build and I
wasn't able to boot the da850-evm.dtb your repo common-clk-v11,
however the legacy board file boot was OK.
make davinci_all_defconfig ARCH=arm
make zImage modules da850-evm.dtb ARCH=arm CROSS_COMPILE=arm-linux- -j8
3140416 bytes read in 1464 ms (2 MiB/s)
20353 bytes read in 15 ms (1.3 MiB/s)
## Flattened Device Tree blob at c0600000
Booting using the fdt blob at 0xc0600000
Loading Device Tree to c7e57000, end c7e5ef80 ... OK
Starting kernel ...
Uncompressing Linux... done, booting the kernel.
(and hang)
If you have some suggestions, I am try them as I get time.
adam
>
> Changes:
>
> 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.
> These are all just runtime dependencies and only needed for certain platforms.
>
> - "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]
>
> [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
>
> You can find a working branch with everything included (plus a few extras, like
> cpufreq-dt) in the "common-clk-v10" 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 | 39 +-
> arch/arm/mach-davinci/usb-da8xx.c | 242 +-----
> drivers/clk/davinci/pll-da830.c | 4 +-
> drivers/clk/davinci/pll-da850.c | 36 +-
> drivers/clk/davinci/pll-dm355.c | 8 +-
> drivers/clk/davinci/pll-dm365.c | 8 +-
> drivers/clk/davinci/pll-dm644x.c | 8 +-
> drivers/clk/davinci/pll-dm646x.c | 8 +-
> drivers/clk/davinci/pll.c | 110 +--
> drivers/clk/davinci/pll.h | 30 +-
> drivers/clk/davinci/psc-dm355.c | 2 +-
> drivers/clk/davinci/psc-dm365.c | 2 +-
> drivers/clk/davinci/psc-dm644x.c | 2 +-
> drivers/clk/davinci/psc-dm646x.c | 2 +-
> drivers/clk/davinci/psc.c | 27 +-
> include/linux/clk/davinci.h | 29 +
> 56 files changed, 860 insertions(+), 3950 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
>
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