linux-kernel - Re: [PATCH v7 1/6] i2c: xiic: skip input clock setup on non-OF systems

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Message-ID: <aX3VqGlIUGCvMY5p@smile.fi.intel.com>
Date: Sat, 31 Jan 2026 12:12:56 +0200
From: Andy Shevchenko <andriy.shevchenko@...el.com>
To: Abdurrahman Hussain <abdurrahman@...thop.ai>
Cc: Andrew Lunn <andrew@...n.ch>, Michal Simek <michal.simek@....com>,
	Andi Shyti <andi.shyti@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	linux-arm-kernel@...ts.infradead.org, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v7 1/6] i2c: xiic: skip input clock setup on non-OF
 systems

On Thu, Jan 29, 2026 at 03:29:45PM -0800, Abdurrahman Hussain wrote:
> > On Jan 29, 2026, at 2:43 PM, Andrew Lunn <andrew@...n.ch> wrote:
> > On Thu, Jan 29, 2026 at 09:43:13PM +0000, Abdurrahman Hussain via B4 Relay wrote:

> >> The xiic driver supports operation without explicit clock configuration
> >> when clocks cannot be specified via firmware, such as on ACPI-based
> >> systems.
> > 
> > Are you saying it is technically impossible to specify a clock in
> > ACPI?
> > 
> > Maybe a more accurate would be:
> > 
> > The xiic driver supports operation without explicit clock
> > configuration when the clocks are not specified via firmware, such as
> > when the ACPI tables are missing the description of the clocks.
> 
> Actually, ACPI (since 6.5) added a ClockInput() macro that can be added to
> _CRS of a device node. The ACPI subsystem in kernel could parse these and
> convert into proper clocks integrated with the CCF. But, AFAIK, this idea was
> rejected in the past.

Rejected by which side? CCF?
Because specification still has that.

-- 
With Best Regards,
Andy Shevchenko