Hello Doug and Kukjin,
On 26 June 2014 21:16, Doug Anderson diand...@chromium.org wrote:
Naveen,
On Thu, Jun 26, 2014 at 5:19 AM, Naveen Krishna Chatradhi
ch.nav...@samsung.com wrote:
Exynos5250 based Snow board has 4 NTC thermistors to measure
temperatures at various points on the board.
IIO based ADC becomes the parent and NTC thermistors are the childs,
via the HWMON interface.
Signed-off-by: Naveen Krishna Chatradhi ch.nav...@samsung.com
---
Posted earlier by Doug Anderson @ https://lkml.org/lkml/2013/3/27/453
This patch depends on (1/4 and 2/4 patches of) patchset posted
http://www.spinics.net/lists/linux-iio/msg13486.html
Which were applied on to Guenter Roeck's tree.
cat sysfs entries exported by hwmon for 4 thermistors
and verified the values on Snow.
arch/arm/boot/dts/exynos5250-snow.dts | 34
+
1 file changed, 34 insertions(+)
NAK.
The first chunk of exynos5250-snow devices have the thermistors
populated, but a huge chunk of devices also _don't_ have them
populated.
I've realized only the rev4 and before boards have thermistors
while going through the git logs of snow related dts files
in an older chrome kernel.
If I remember my history properly, rev3 and earlier all had
thermistors. Some of rev4 might have thermistors (I never got a clear
answer). ...and rev5 definitely doesn't have resistors. Aside from
thermistors there's no good reason to differentiate rev3 and rev4
(they just have different memory). The upstream kernel may eventually
need to differentiate rev4 and rev5 since they have a different audio
codec.
I've found one patch which says, No thermistors on Rev5 and above boards
I still thought, we should support few boards out there.
But, i din't knew they were removed completely.
See https://chromium-review.googlesource.com/#/c/170841/ for some
descriptions of the different revisions of snow and how they were
handled in the Chrome OS tree.
Got it now, Thanks
See https://chromium-review.googlesource.com/#/c/186357/ for
thermistors talk. Patch set #1 actually split out rev3, but we then
decided that we really didn't need to use the thermistors on any of
the revisions so the later patchsets just totally take them out.
So, no need of thermistor nodes on Snow.
I thought https://lkml.org/lkml/2013/3/27/453 patch is missed out.
-Doug
Kukjin, Sorry for the confusion. Please drop this one.
--
Thanks,
(: Nav :)
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