Messages in this thread | | | From | "Rafael J. Wysocki" <> | Subject | Re: [PATCH v2 0/2] pinctrl: Intel Cherryview/Braswell support | Date | Tue, 04 Nov 2014 14:31:41 +0100 |
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On Tuesday, November 04, 2014 11:39:07 AM Mika Westerberg wrote: > On Tue, Nov 04, 2014 at 10:20:56AM +0200, Mika Westerberg wrote: > > On Mon, Nov 03, 2014 at 05:24:55PM -0600, Timur Tabi wrote: > > > On Mon, Nov 3, 2014 at 5:01 AM, Mika Westerberg > > > <mika.westerberg@linux.intel.com> wrote: > > > > Hi, > > > > > > > > This is second version of the patch series adding pinctrl/GPIO support > > > > for Intel Braswell and Cherrryview. The previous version can be found here: > > > > > > > > https://lkml.org/lkml/2014/10/27/118 > > > > > > > > I've dropped patches [2/4] and [3/4] as they are already applied to the > > > > pinctrl tree. > > > > > > Mika, > > > > > > I am also trying to add ACPI enablement to my pinctrl driver (not yet > > > submitted), but I'm new to ACPI and pin control drivers, so I have a > > > lot of catching up to do. > > > > > > In reviewing this patchset, it appears to me that pinctrl-cherryview.c > > > is a normal pinctrl driver that has an acpi_match_table entry, and > > > nothing more. > > > > Indeed, it just a normal platform driver that can be enumerated from > > ACPI using the .acpi_match_table entry. > > > > > Assuming that this driver is booting on an ACPI system, what is the > > > mechanism that calls into the driver to configure the pins? Is there > > > a definition for pin control in ASL that provides similar > > > functionality as the pinctrl nodes in a device tree? > > > > There is nothing like that yet in ACPI world but with the ACPI _DSD > > patches we are getting properties similar to DT which means that we can > > provide pinctrl bindings from ACPI systems as well. Typically it has > > been the BIOS that configures things but it cannot get everything 100% > > right. > > > > Currently I've been testing the muxing functionality so that I have a > > small board file that sets mappings and the driver core handles > > everything from there. For example I have development board where SPI > > pins are muxed as GPIOs by the BIOS and with the mappings when the SPI > > device appears the core will mux SPI out of those pins. > > For reference the latest ACPI _DSD patches can be found here > > https://lkml.org/lkml/2014/10/21/762
Actually, it's better to pull the device-properties branch:
git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git device-properties
because that contains the lastest changes. It will be rebased in the future, though, so don't merge it into your "immutable" branches.
-- I speak only for myself. Rafael J. Wysocki, Intel Open Source Technology Center.
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