Re: [PATCH v2 09/13] i3c: dw-i3c-master: Add a quirk to skip clock and reset

Alexandre Belloni <[email protected]>
Newsgroups dev.linux.lists.acpica-devel,org.infradead.lists.linux-i3c,org.kernel.vger.linux-acpi,org.kernel.vger.linux-devicetree,org.kernel.vger.linux-hwmon,org.kernel.vger.linux-kernel
Message-ID <[email protected]>
On 10/04/2026 11:37:11+0530, Akhil R wrote:
> On Thu, 9 Apr 2026 22:45:09 -0400, Frank Li wrote:
> > On Thu, Apr 09, 2026 at 04:27:39PM +0530, Akhil R wrote:
> >> Some ACPI-enumerated devices like Tegra410 do not have clock and reset
> >> resources exposed via the clk/reset frameworks. Add a match data for
> > 
> > why not export fix clock at ACPI?
> > 
> >> such devices to skip acquiring clock and reset controls during probe.
> >>
> >> Move match data parsing before clock/reset acquisition so the quirk is
> >> available early enough.  When the quirk is set, fall back to reading
> >> the clock rate from the "clock-frequency" device property instead.
> > 
> > "clock-frequency" is legacy proptery.
> 
> The document ACPI on ARMv8 Servers [1] suggests not to use clock or reset
> framework at all. I also could not find any proper way to export the clock
> to the kernel from the ACPI table. The same document suggests to use only
> _DSD properties, if to pass any data to the kernel.
> 
> I can rename the property to 'default-clock-rate' if that sounds good.
> Please let me know your suggestion.
> 

"clock-frequency" is fine for ACPI

> [1]: https://www.kernel.org/doc/html/v6.1/arm64/arm-acpi.html#programmable-power-control-resources
> 
> Best Regards,
> Akhil

-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
lmpx.com only provides a reader for public news (NNTP) servers. It is not affiliated with the servers or forums shown here and is not responsible for the content of articles, which is written by their respective authors.