lkml.org 
[lkml]   [2017]   [Dec]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: pinctrl-amd: What hardware does it apply to?
Date
On Thursday, December 21, 2017 8:25:03 AM CET Andrew Cooks wrote:
> I'm working on gpio for an AMD Family 16h Model 30h system[1].
> The SoC is the same as the GX412-TC used in the PC Engines APU2.
>
> There is an out-of-tree gpio driver (gpio-amd) for this SoC in the
> meta-amd yocto layer[2]. Another driver (gpio-sb8xx) was submitted
> for upstream inclusion, but was knocked back with the suggestion
> that pinctrl is the way forward[3].
>
> I would much prefer to use a mainline driver for the system I'm
> working on, so I'm looking at the pinctrl-amd driver to see
> whether it applies to our SoC, or whether it could be extended,
> or used as starting point for a new driver.
>
> The out-of-tree drivers apply to the GX412-TC SoC and uses PCI
> for probing:

Just a FYI: due to these difficulties with getting a gpio driver
upstream, Alan Mizrahi upstreamed an in-kernel led-apu.c driver [0]
that sort of bypasses the whole pinctrl vs gpio issue.

|#define APU1_FCH_ACPI_MMIO_BASE 0xFED80000
|#define APU1_FCH_GPIO_BASE (APU1_FCH_ACPI_MMIO_BASE + 0x01BD)
|#define APU1_LEDON 0x08
|#define APU1_LEDOFF 0xC8
|#define APU1_NUM_GPIO 3
|#define APU1_IOSIZE sizeof(u8)
|
|#define APU2_FCH_ACPI_MMIO_BASE 0xFED80000
|#define APU2_FCH_GPIO_BASE (APU2_FCH_ACPI_MMIO_BASE + 0x1500)
|#define APU2_GPIO_BIT_WRITE 22
|#define APU2_APU2_NUM_GPIO 4
|#define APU2_IOSIZE sizeof(u32)

If you are just after LEDs or gpio-keys you probably can go the same
route?

Thanks,
Christian

[0] <https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/leds/leds-apu.c>

\
 
 \ /
  Last update: 2017-12-21 14:03    [W:0.099 / U:25.200 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site