Skip to content
  1. Jan 27, 2016
  3. Jan 25, 2016
  5. Jan 21, 2016
  7. Jan 18, 2016
  9. Jan 15, 2016
  11. Jan 11, 2016
    • Tony Lindgren's avatar
      ARM: dts: Fix omap5 PMIC control lines for RTC writes · af756bbc
      Tony Lindgren authored 
      

The palmas PMIC has two control lines that need to be muxed properly
for things to work. The sys_nirq pin is used for interrupts, and msecure
pin is used for enabling writes to some PMIC registers.

Without these pins configured properly things can fail in mysterious
ways. For example, we can't update the RTC registers on palmas PMIC
unless the msecure pin is configured. And this is probably the reason
why we had RTC missing from the omap5 dts file.

According to "OMAP5430 ES2.0 Data Manual [Public] VErsion A (Rev. F)"
swps052f.pdf, mux mode 1 is for sys_drm_msecure so in theory there's
should be no need to configure it as a GPIO pin.

However, it seems there are some reliability issues using the msecure
mux mode. And the TI trees configure the msecure pin as GPIO out high
instead.

As the PMIC only cares that the msecure line is high to allow access
to the RTC registers, let's use a GPIO hog as suggested by Nishanth
Menon <nm@ti.com>. Also the use of the internal pull was considered
but supposedly that may not be capable of keeping the line high in
a noisy environment.

If we ever see high security omap5 products in the mainline tree,
those need to skip the msecure pin muxing and ignore setting the GPIO
hog. Chances are the related pin mux registers are locked in that case
and the msecure pin is managed by whatever software may be running in
the ARM TrustZone.

Who knows what the original intention of the msecure pin was. Maybe
it was supposed to prevent the system time to be set back for some
game demo modes to time out? Anyways, it seems that later PMICs like
tps659037 have recycled this pin for "powerhold" and devices like
beagle-x15 do not need changes to the msecure pin configuration.

To avoid further confusion with TWL variant PMICs, beagle-x15 does
not have a back-up battery for RTC palmas. Instead the mcp79410 RTC
is used with rtc-ds1307 driver. There is a "powerhold" jumper j5
holes near the palmas PMIC, and shorting it seems to power up
beagle-x15 automatically. It is unknown if it also has other side
effects to the beagle-x15 power up sequence.

Cc: stable@vger.kernel.org # v4.4
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
      af756bbc
    • Stanimir Varbanov's avatar
      ARM: dts: ifc6410: enable PCIe DT node for this board · 668f4729
      Stanimir Varbanov authored 
      

Enable PCIe DT node and fill PCIe DT node with regulator, pinctrl and reset
GPIO, to use the PCIe on the ifc6410 board.

Signed-off-by: default avatarStanimir Varbanov <stanimir.varbanov@linaro.org>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
      668f4729
    • Stanimir Varbanov's avatar
      ARM: dts: apq8064: add PCIe devicetree node · bcc74b09
      Stanimir Varbanov authored 
      

Add the PCIe DT node so that it can probe and be used.

Signed-off-by: default avatarStanimir Varbanov <stanimir.varbanov@linaro.org>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
      bcc74b09
  13. Jan 08, 2016
  15. Jan 07, 2016
  17. Jan 06, 2016
  19. Jan 04, 2016
  21. Dec 31, 2015
  23. Dec 29, 2015