Messages in this thread | | | Subject | Re: [PATCH v6 00/41] ARM: davinci: convert to common cloc k framework | From | David Lechner <> | Date | Tue, 23 Jan 2018 10:03:11 -0600 |
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On 01/23/2018 08:54 AM, Bartosz Golaszewski wrote: > 2018-01-22 18:30 GMT+01:00 David Lechner <david@lechnology.com>: >> On 01/22/2018 05:14 AM, Bartosz Golaszewski wrote: >>> >>> 2018-01-20 18:13 GMT+01:00 David Lechner <david@lechnology.com>: >>>> >>>> This series converts mach-davinci to use the common clock framework. >>>> >>>> The series works like this, the first 19 patches create new clock drivers >>>> using the common clock framework. There are basically 3 groups of clocks >>>> - >>>> PLL, PSC and CFGCHIP (syscon). There are six different SoCs that each >>>> have >>>> unique init data, which is the reason for so many patches. >>>> >>>> Then, starting with "ARM: da830: add new clock init using common clock", >>>> 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 three patches add device tree clock support to the one SoC that >>>> supports it. >>>> >>>> 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: >>>> >>>> This series applies on top of linux-davinci/master plus the following >>>> patches: >>>> - [1] "clk: fix reentrancy of clk_enable() on UP systems" (in clk-next) >>>> - [2] "clk: add helper functions for managing clk_onecell_data" >>>> - [3] "clk: divider: read-only divider can propagate rate change" >>>> - [4],[5],[6],[7],[8],[9] series "ARM: davinci: common clock prep work" >>>> >>> >>> Hi David, >>> >>> I'm getting a splat[1] when trying to mount the rootfs over nfs on a >>> da850-lcdk. >>> >>> I'll try to figure out what's happening. >>> >>> Best regards, >>> Bartosz Golaszewski >>> >>> [1] https://pastebin.com/D94z8SAe >>> >> >> Could it have something to do with the "rmii" clock? I don't think I added >> that >> in the device tree. >> > > I'm looking at it now. There are problems with emac & mdio both in > legacy and in DT mode.
Adam, is networking working for you on the DA850 EVM?
> > The davinci_mdio driver seems to not get an actual functional clock > (phy is reported as down). I'm seeing that in old legacy code, > mdio_clk has emac_clk as parent, while after your changes they share > pll0_sysclk4 as parent, although I'm not sure if that has anything to > do with it.
The two clocks prior to these changes was a hack to work around a limitation of the old lock code (because of the way it used a linked list each clock could only be used once) so, yes, that should not have anything to do with it.
I see that there is no clk_prepare_enable() in the mdio driver or the emac driver. I suppose it expects pm_runtime to take care of this maybe?
You can see if the clock is enabled by running:
cat /sys/kernel/debug/clk/clk_summary
> > I'll see about the rmii clock too. FWIW, the rmii clock is in the clock init for non-DT da850.
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