From: Akhil R <akhilrajeev@nvidia.com>
To: <frank.li@nxp.com>
Cc: <acpica-devel@lists.linux.dev>, <akhilrajeev@nvidia.com>,
<alexandre.belloni@bootlin.com>, <conor+dt@kernel.org>,
<devicetree@vger.kernel.org>, <ebiggers@kernel.org>,
<krzk+dt@kernel.org>, <lenb@kernel.org>,
<linux-acpi@vger.kernel.org>, <linux-hwmon@vger.kernel.org>,
<linux-i3c@lists.infradead.org>, <linux-kernel@vger.kernel.org>,
<linux@roeck-us.net>, <miquel.raynal@bootlin.com>,
<p.zabel@pengutronix.de>, <rafael@kernel.org>,
<robert.moore@intel.com>, <robh@kernel.org>,
<sakari.ailus@linux.intel.com>,
<wsa+renesas@sang-engineering.com>
Subject: Re: [PATCH v2 09/13] i3c: dw-i3c-master: Add a quirk to skip clock and reset
Date: Fri, 10 Apr 2026 11:37:11 +0530 [thread overview]
Message-ID: <20260410060712.30377-1-akhilrajeev@nvidia.com> (raw)
In-Reply-To: <adhkNYQW73yQ728h@lizhi-Precision-Tower-5810>
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.
[1]: https://www.kernel.org/doc/html/v6.1/arm64/arm-acpi.html#programmable-power-control-resources
Best Regards,
Akhil
next prev parent reply other threads:[~2026-04-10 6:07 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-09 10:57 [PATCH v2 00/13] Support ACPI and SETAASA device discovery Akhil R
2026-04-09 10:57 ` [PATCH v2 01/13] dt-bindings: i3c: Add mipi-i3c-static-method to support SETAASA Akhil R
2026-04-10 2:00 ` Frank Li
2026-04-10 4:30 ` Akhil R
2026-04-09 10:57 ` [PATCH v2 02/13] ACPICA: Read LVR from the I2C resource descriptor Akhil R
2026-04-09 11:07 ` Rafael J. Wysocki
2026-04-10 2:04 ` Frank Li
2026-04-10 4:45 ` Akhil R
2026-04-10 10:59 ` Rafael J. Wysocki
2026-04-10 10:57 ` Rafael J. Wysocki
2026-04-09 10:57 ` [PATCH v2 03/13] i3c: master: Use unified device property interface Akhil R
2026-04-09 10:57 ` [PATCH v2 04/13] i3c: master: Support ACPI enumeration of child devices Akhil R
2026-04-10 2:17 ` Frank Li
2026-04-10 5:31 ` Akhil R
2026-04-09 10:57 ` [PATCH v2 05/13] i3c: master: Add support for devices using SETAASA Akhil R
2026-04-10 2:25 ` Frank Li
2026-04-09 10:57 ` [PATCH v2 06/13] i3c: master: Add support for devices without PID Akhil R
2026-04-10 2:37 ` Frank Li
2026-04-09 10:57 ` [PATCH v2 07/13] i3c: master: match I3C device through DT and ACPI Akhil R
2026-04-10 2:40 ` Frank Li
2026-04-09 10:57 ` [PATCH v2 08/13] i3c: dw-i3c-master: Add SETAASA as supported CCC Akhil R
2026-04-10 2:41 ` Frank Li
2026-04-09 10:57 ` [PATCH v2 09/13] i3c: dw-i3c-master: Add a quirk to skip clock and reset Akhil R
2026-04-10 2:45 ` Frank Li
2026-04-10 6:07 ` Akhil R [this message]
2026-04-09 10:57 ` [PATCH v2 10/13] i3c: dw-i3c-master: Add ACPI ID for Tegra410 Akhil R
2026-04-10 2:47 ` Frank Li
2026-04-09 10:57 ` [PATCH v2 11/13] hwmon: spd5118: Remove 16-bit addressing Akhil R
2026-04-09 14:11 ` Guenter Roeck
2026-04-09 10:57 ` [PATCH v2 12/13] hwmon: spd5118: Add I3C support Akhil R
2026-04-09 14:19 ` Guenter Roeck
2026-04-09 10:57 ` [PATCH v2 13/13] arm64: defconfig: Enable I3C and SPD5118 hwmon Akhil R
2026-04-10 6:39 ` Krzysztof Kozlowski
2026-04-10 6:57 ` Guenter Roeck
2026-04-10 7:18 ` Krzysztof Kozlowski
2026-04-10 8:37 ` Akhil R
2026-04-10 9:57 ` Krzysztof Kozlowski
2026-04-10 7:04 ` Akhil R
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