Re: [PATCH v3 3/4] gpio: syscon: reuse for keystone 2 socs
shc_work at mail.ru
Fri Sep 5 01:40:19 PDT 2014
Fri, 5 Sep 2014 10:30:20 +0200 от Linus Walleij <linus.walleij at linaro.org>:
> On Wed, Sep 3, 2014 at 7:05 PM, Grygorii Strashko
> <grygorii.strashko at ti.com> wrote:
> > 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 at 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.
More information about the linux-arm-kernel