linux-kernel - Re: [PATCH] i2c: designware: Do not require clock when SSCN and FFCN are provided

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Date:	Wed, 16 Dec 2015 16:55:34 -0800
From:	Loc Ho <lho@....com>
To:	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
Cc:	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	wsa@...-dreams.de, Ken Xue <Ken.Xue@....com>,
	linux-i2c@...r.kernel.org, linux-acpi@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] i2c: designware: Do not require clock when SSCN and FFCN
 are provided

Hi,

> The current driver uses input clock source frequency to calculate
> values for [SS|FS]_[HC|LC] registers. However, when booting ACPI, we do not
> currently have a good way to provide the frequency information.
> Instead, we can leverage the SSCN and FFCN ACPI methods, which can be used
> to directly provide these values.
>
> So, this patch removes the clock requirement when SSCN and FFCN
> are provided.
>
> Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>

Tested on X-Gene ACPI boot with updated FW and work just fine.

-Loc
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