Fri, 5 Sep 2014 10:30:20 +0200 ?? Linus Walleij [off-list ref]:

On Wed, Sep 3, 2014 at 7:05 PM, Grygorii Strashko
[off-list ref] wrote:

quoted

On Keystone SOCs, ARM host can send interrupts to DSP cores using the
DSP GPIO controller IP. Each DSP GPIO controller provides 28 IRQ signals for
each DSP core. This is one of the component used by the IPC mechanism used
on Keystone SOCs.

Keystone 2 DSP GPIO controller has specific features:
- each GPIO can be configured only as output pin;
- setting GPIO value to 1 causes IRQ generation on target DSP core;
- reading pin value returns 0 - if IRQ was handled or 1 - IRQ is still
  pending.

This patch updates gpio-syscon driver to be reused by Keystone 2 SoCs,
because the Keystone 2 DSP GPIO controller is controlled through Syscon
devices and, as requested by Linus Walleij, such kind of GPIO controllers
should be integrated with drivers/gpio/gpio-syscon.c driver.

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
---
 .../devicetree/bindings/gpio/gpio-dsp-keystone.txt | 39 ++++++++++++++++++++++

Rob, can you look at these bindings?

I suspect they may fall under your category of "not a real device, but
leaking Linux implementation internals".

This is the reason why I suggested to move the offsets in the driver.

---