linux-kernel - Re: [PATCHv2 0/4] ACPI / LPSS: Solution for two issues seen on Asus T100

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Message-ID: <20140515161148.GM1674@lahna.fi.intel.com>
Date:	Thu, 15 May 2014 19:11:48 +0300
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	"Li, Aubrey" <aubrey.li@...ux.intel.com>
Cc:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Mike Turquette <mturquette@...aro.org>,
	Jin Yao <yao.jin@...ux.intel.com>, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2 0/4] ACPI / LPSS: Solution for two issues seen on Asus
 T100

On Thu, May 15, 2014 at 11:59:46PM +0800, Li, Aubrey wrote:
> On 2014/5/15 22:53, Andy Shevchenko wrote:
> > On Thu, 2014-05-15 at 22:35 +0800, Li, Aubrey wrote:
> >> On 2014/5/15 21:40, Heikki Krogerus wrote:
> >>> Changes since v1:
> >>> - now using do_div() in clk_fd_recalc_rate() as suggested by Andy
> >>> - NULL checks for clk_name allocation in acpi_lpss.c
> >>>
> >>> This combines two patch sets for LPSS that I had already send for
> >>> review separately. They conflicted with each other.
> >>>
> >>> The first two patches will fix a problem were the context of the
> >>> private LPSS registers is lost when entering D3. The last two will add
> >>> support for the M/N dividers on LPSS by adding a new basic clock type
> >>> for fractional dividers. The UART driver needs support for it in order
> >>> to get clock rates that suit the requested baud rates.
> >>
> >> The major issue in my mind is, this proposal makes a couple between I2C
> >> designware, HSUART, or probably DMA driver as well with LPSS driver.
> > 
> > acpi_lpss driver creates platform devices for each found and enumerated
> > device.
> 
> > If there no acpi_lpss enabled the drivers work as supposed without it.
> 
> This is not true.

The drivers work fine on non-LPSS platform. If you make them depend on
acpi_lpss, you break that.
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