linux-kernel - Re: [PATCH v5 0/8] mfd: introduce a driver for LPSS devices on SPT

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Message-ID: <1437651621.29746.24.camel@linux.intel.com>
Date:	Thu, 23 Jul 2015 14:40:21 +0300
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	linux-acpi@...r.kernel.org, linux-pm@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Vinod Koul <vinod.koul@...el.com>,
	Lee Jones <lee.jones@...aro.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
	"Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
	mturquette@...libre.com
Cc:	Stephen Boyd <sboyd@...eaurora.org>
Subject: Re: [PATCH v5 0/8] mfd: introduce a driver for LPSS devices on SPT

On Mon, 2015-07-06 at 15:22 +0300, Andy Shevchenko wrote:
> The new coming Intel platforms such as Skylake will contain 
> Sunrisepoint PCH.
> 
> The driver is based on MFD framework since the main device, i.e. 
> serial bus
> controller, contains register space for itself, DMA part, and an 
> additional
> address space (convergence layer). 
> 
> The public specification of the register map is avaiable in [1].
> 
> This is fifth generation of the patch series to bring support LPSS 
> devices
> found on Intel Sunrisepoint (Intel Skylake PCH). Previous one can be 
> found here
> [2].
> 
> The series has few logical parts:
> - patches 1-3 prepares PM core, ACPI, and driver core (PM) to handle 
> our case
> - patches 4-6 introduce unregistering platform devices in MFD in 
> reversed
>   order
> - patch 7 implements iDMA 64-bit driver
> - patch 8 introduces an MFD driver for LPSS devices
> 
> The patch 7 can be applied independently, though it's better if it 
> goes before
> patch 8.
> 
> The driver has been tested with SPI and UART on Intel Skylake PCH.
> 
> [1] https://download.01.org/future-platform-configuration
> -hub/skylake/register-definitions/332219-002.pdf
> [2] http://www.spinics.net/lists/linux-acpi/msg58622.html

Lee, can we move forward this thing somehow?

We may create a topic branch for you where we apply already Acked
patches (1-5) to reduce burden on reviewers. Would it help?

> 
> Changelog v5:
>   - rebase on top of v4.2-rc1
>   - patch 3 is modified accordingly to new changes in 
> drivers/base/dd.c
>   - correct Rafael's email in patch 3
> 
> Changelog v4:
>   - replace patch 3 by Rafael's suggession
>   - append ACKs from Rafael
>   - rebase on top of v4.1-rc8
> 
> Changelog v3:
>   - rework patch 3 to be used for all kind of devices (address Alan 
> comment)
>   - iDMA 64-bit driver improvements:
>     - fix burst-to-register conversion
>     - remove excessive locking
>   - do not expose core part to the user (Kconfig)
>   - address most of Lee's comments
>   - append ACKs
>   - rebase on top of v4.1-rc6
> 
> Changelog v2:
>   - new DMA driver to fully support iDMA 64-bit IP
>   - patch 3 is added to wake up parent devices when ->probe(), 
> ->remove(), or
>     ->shutdown()
>   - MFD core is unregistering devices in reversed order
>   - address few Lee's comments on v1
>   - address Russel's comment, therefore use clkdev_create() helper
>   - intel-lpss{,-acpi,-pci} are modified regarding to above changes
> 
> Andy Shevchenko (5):
>   klist: implement klist_prev()
>   driver core: implement device_for_each_child_reverse()
>   mfd: make mfd_remove_devices() iterate in reverse order
>   dmaengine: add a driver for Intel integrated DMA 64-bit
>   mfd: Add support for Intel Sunrisepoint LPSS devices
> 
> Mika Westerberg (2):
>   PM / QoS: Make it possible to expose device latency tolerance to
>     userspace
>   ACPI / PM: Attach ACPI power domain only once
> 
> Rafael J. Wysocki (1):
>   Driver core: wakeup the parent device before trying probe
> 
>  drivers/acpi/device_pm.c      |   8 +
>  drivers/acpi/internal.h       |   2 +
>  drivers/acpi/scan.c           |  46 ++-
>  drivers/base/core.c           |  43 +++
>  drivers/base/dd.c             |  20 ++
>  drivers/base/power/power.h    |   2 +
>  drivers/base/power/qos.c      |  37 +++
>  drivers/base/power/sysfs.c    |  11 +
>  drivers/dma/Kconfig           |   5 +
>  drivers/dma/Makefile          |   1 +
>  drivers/dma/idma64.c          | 724 
> ++++++++++++++++++++++++++++++++++++++++++
>  drivers/dma/idma64.h          | 232 ++++++++++++++
>  drivers/mfd/Kconfig           |  23 ++
>  drivers/mfd/Makefile          |   3 +
>  drivers/mfd/intel-lpss-acpi.c |  84 +++++
>  drivers/mfd/intel-lpss-pci.c  | 113 +++++++
>  drivers/mfd/intel-lpss.c      | 524 ++++++++++++++++++++++++++++++
>  drivers/mfd/intel-lpss.h      |  62 ++++
>  drivers/mfd/mfd-core.c        |   2 +-
>  include/linux/device.h        |   2 +
>  include/linux/klist.h         |   1 +
>  include/linux/pm_qos.h        |   5 +
>  lib/klist.c                   |  41 +++
>  23 files changed, 1974 insertions(+), 17 deletions(-)
>  create mode 100644 drivers/dma/idma64.c
>  create mode 100644 drivers/dma/idma64.h
>  create mode 100644 drivers/mfd/intel-lpss-acpi.c
>  create mode 100644 drivers/mfd/intel-lpss-pci.c
>  create mode 100644 drivers/mfd/intel-lpss.c
>  create mode 100644 drivers/mfd/intel-lpss.h
> 

-- 
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy
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