[RFC PATCH v3 3/9] clk: renesas: add R906G032 driver

[Ralph Siemsen]

On Wed, Feb 22, 2023 at 06:47:44PM +0100, Marek Vasut wrote:
>On 2/22/23 18:21, Ralph Siemsen wrote:
>>On Wed, Feb 22, 2023 at 06:07:45PM +0100, Marek Vasut wrote:
>>>On 2/22/23 17:57, Ralph Siemsen wrote:
>>>>On Wed, Feb 22, 2023 at 05:06:14PM +0100, Marek Vasut wrote:
>>>>>On 2/22/23 16:44, Ralph Siemsen wrote:
>>>>>>Clock driver for the Renesas RZ/N1 SoC family. This is based
>>>>>>on the Linux kernel drivers/clk/renesas/r9a06g032-clocks.c.
>>>>>
>>>>>For starters, can you please include the exact kernel version 
>>>>>, ideally commit ID, from which this way pulled, so that 
>>>>>future updates can pull in the diffs from that commit easily ?
>>>>
>>>>Very reasonable request, but a bit difficult to give a concise 
>>>>answer. Originally I took the driver as found in the 5.15 
>>>>kernel. The driver actually had not changed since 5.13 commit 
>>>>6bd913f54f2f ("clk: renesas: r9a06g032: Switch to 
>>>>.determine_rate()"). So that's the starting point.
>>>>
>>>>I incorporated subsequent changes to the clock tables and 
>>>>related cleanups. Those were only merged into Linux much later:
>>>>
>>>>2dee50ab9e72 clk: renesas: r9a06g032: Fix UART clkgrp bitsel
>>>>f46efcc4746f clk: renesas: r9a06g032: Drop some unused fields
>>>>2a6da4a11f47 clk: renesas: r9a06g032: Fix the RTC hclock description
>>>>
>>>>Linux driver also had a few other commits, but these are not 
>>>>applicable to the u-boot version due to structural changes:
>>>>
>>>>6bd913f54f2f clk: renesas: r9a06g032: Switch to .determine_rate()
>>>>f2fb4fe62390 clk: renesas: Zero init clk_init_data
>>>>2182066d95c3 clk: renesas: r9a06g032: Probe possible children
>>>>885525c1e7e2 clk: renesas: r9a06g032: Export function to set dmamux
>>>>02693e11611e clk: renesas: r9a06g032: Repair grave increment error
>>>>
>>>>So I would say it is "up to date" with the lastest Linux commit, 
>>>>even though it is based on an earlier version. Is there a good 
>>>>way to include the above in the commit message, succinctly?
>>>
>>>Is this still in sync with Linux 6.1.y ? That's the latest LTS .
>>
>>Yes. Although the commits have different hashes than what I reported 
>>above, the 6.1.y LTS branch has the same changes.
>
>Then please include the Linux 6.1.y commit ID , or Torvalds' tree if 
>that contains new fixes . Let's not use some old/downstream stuff .

I've amended the commit message as follows:

     Clock driver for the Renesas RZ/N1 SoC family. This is based
     on the Linux kernel drivers/clk/renesas/r9a06g032-clocks.c as found in
     commit 02693e11611e ("clk: renesas: r9a06g032: Repair grave increment error")
     included in Torvalds kernel v6.2. Identical code is in LTS 6.1.y.

>>Note that the u-boot version of the driver has changed considerably 
>>from the Linux version. In terms of pulling future diffs over, I 
>>would be concerned mostly about keeping the clock tables in sync. 
>>There have been a few mistakes found and fixed in those already.
>
>Are those fixes in mainline Linux ?

Yes, they are in mainline:
2dee50ab9e72 clk: renesas: r9a06g032: Fix UART clkgrp bitsel
   merged into 6.0, and also backported to earlier LTS branches
2a6da4a11f47 clk: renesas: r9a06g032: Fix the RTC hclock description
    merged into 5.19, seems to be missing from LTS branches

Regards,
Ralph