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Subject[RESEND RFC PATCH 0/5] platform drivers for UP Board
Date
[Re-sending to a wider audience suggested by Darren Hart]

The UP Board is a new SBC based on the Intel Atom X5-Z8350 "Cherry
Trail" SoC and features a 40-pin I/O pin header and form-factor
inspired by the Raspberry Pi 2.

It utilises a CPLD between the SoC and the external 40-pin header
to provide buffered voltage level-shifting of the I/O signals, mux
switching and LED control, and programmable pin mapping between the
SoC and the external pin header.

The gpio, pinctrl and led drivers provided in this patch series
enable and manage the functions provided by that CPLD.

I have some open questions about this patch series:
* Is it ok to place all of these various UP board drivers together
in drivers/platform/x86/, or would it be preferable to place them
in the respective sub-system directories (gpio, pinctrl, etc.)?
My rationale for keeping them together here is that they are all
specific to this UP Board platform and not expected to be
generally useful on any other platforms (except variants of UP).
* Is it acceptable to include hard-coded references to ACPI device
IDs (representing devices integrated on the SoC devices) for the
purpose of pin map and gpio references? Or is it required to
use only named gpio pins?

Any feedback/suggestions on the questions above, and the patch series
in general, would be greatly appreciated!

Further information on the UP board can be obtained from [1] and [2].

[1] https://www.up-board.org
[2] https://up-community.org

Dan O'Donovan (5):
platform: x86: add driver for UP Board I/O CPLD
platform: x86: add UP Board I/O pinctrl driver
platform: x86: add UP Board I/O gpio driver
platform: x86: add UP Board CPLD LED driver
platform: x86: add platform driver for UP Board

drivers/platform/x86/Kconfig | 13 +
drivers/platform/x86/Makefile | 5 +
drivers/platform/x86/up_board.c | 167 ++++++++++
drivers/platform/x86/up_board_cpld.c | 560 ++++++++++++++++++++++++++++++++
drivers/platform/x86/up_board_cpld.h | 38 +++
drivers/platform/x86/up_board_gpio.c | 254 +++++++++++++++
drivers/platform/x86/up_board_gpio.h | 59 ++++
drivers/platform/x86/up_board_leds.c | 85 +++++
drivers/platform/x86/up_board_leds.h | 50 +++
drivers/platform/x86/up_board_pinctrl.c | 285 ++++++++++++++++
drivers/platform/x86/up_board_pinctrl.h | 102 ++++++
11 files changed, 1618 insertions(+)
create mode 100644 drivers/platform/x86/up_board.c
create mode 100644 drivers/platform/x86/up_board_cpld.c
create mode 100644 drivers/platform/x86/up_board_cpld.h
create mode 100644 drivers/platform/x86/up_board_gpio.c
create mode 100644 drivers/platform/x86/up_board_gpio.h
create mode 100644 drivers/platform/x86/up_board_leds.c
create mode 100644 drivers/platform/x86/up_board_leds.h
create mode 100644 drivers/platform/x86/up_board_pinctrl.c
create mode 100644 drivers/platform/x86/up_board_pinctrl.h

--
2.1.4

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