On 28/10/16 03:53, Stephen Boyd wrote:
On 10/18, Tero Kristo wrote:
Hi,
As a recap, this series is part of the ongoing work to get rid of the
hwmod database under mach-omap2 folder. This series converts the
existing clock related functionality to a new clock type, which will
allow removing all the .clkctrl related items from hwmod database.
This series adds sample solution for OMAP4 only, rest of the SoCs can
be converted automatically once the approach is acceptable.
v4 has the following high level changes compared to v3:
- Clock data is now statically built-in to the driver
- Adds clockdomain provider support, which can be used to fetch
clocks based on clockdomain relation. Only clockdomains need to be
registered within DT.
- Added some automatic clock alias generation support to the TI clock
drivers, if this is not acceptable, I can change this to add all the
aliases under the individual drivers/clk/ti/clk-xyz.c files
Is there a plan to get rid of the aliases entirely? Or we can't
do that because DT is not fully supported on these platforms? I'm
mostly wondering how long that sort of code is going to stick
around and if it's better to fully compartmentalize it to the
SoCs that are affected or if it should be a core feature of TI
driver.
Eventually that should happen. However, we have plenty of legacy code
still in place which depend on clk_get functionality within kernel. The
major contributing factor is the hwmod codebase, for which we have plans to:
- get this clock driver merged
- implement a new interconnect driver for OMAP family SoCs
- interconnect driver will use DT handles for fetching clocks, rather
than clock aliases
- reset handling will be implemented as part of the interconnect driver
somehow (no prototype / clear plans for that as of yet)
- all the hwmod stuff can be dropped
The clock alias handling is still needed as a transition phase until all
the above is done, then we can start dropping them. Basically anything
that is using omap_hwmod depends on the clock aliases right now.
- As a sample, only omap4 clock data is available with this set
After this series, the clock data can be dropped from the hwmod database
for OMAP4, I have working patches for this for anybody interested. Also,
the DT files require some modifications to add proper support for
clockdomain providers, and drop some unnecessary clock nodes.
Can this be shared as a git tree on the web? Hopefully I can see
the resulting DTS and understand what's going on better.
Sure, here is a test branch I've been using, it has some extra hacks on
top for debugging purposes, but the DTS changes are visible also.
https://github.com/t-kristo/linux-pm/tree/4.9-rc1-hwmod-clks-w-data
Boot + simple PM test seems to be working on OMAP4 with this set, and
boot test with other boards I have access to don't seem to cause any
issues. Applies on top of 4.9-rc1.
Awesome!
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