On Saturday 27 July 2013 02:15 AM, Tomasz Figa wrote:
On Friday 26 of July 2013 09:40:15 Stephen Warren wrote:
(CC'ing the new DT binding maintainers and mailing list on this reply,
hence quoting the whole of the DT binding)
On 07/25/2013 06:29 AM, Laxman Dewangan wrote:
Palmas series device like TPS65913, TPS80036 supports the backup
battery for powering the RTC when no other energy source is
available.
The backup battery is optional, connected to the VBACKUP pin, and can
be nonrechargeable or rechargeable. The rechargeable battery can be
charged from the system supply using the backup battery charger.
Add support for enabling charging of this backup battery. Also add
the DT binding document and the new properties to have this support.
Signed-off-by: Laxman Dewangan <ldewangan@xxxxxxxxxx>
---
.../devicetree/bindings/rtc/rtc-palmas.txt | 28
++++++++++++++ drivers/rtc/rtc-palmas.c |
39 ++++++++++++++++++++ 2 files changed, 67 insertions(+), 0
deletions(-)
create mode 100644
Documentation/devicetree/bindings/rtc/rtc-palmas.txt
diff --git a/Documentation/devicetree/bindings/rtc/rtc-palmas.txt
b/Documentation/devicetree/bindings/rtc/rtc-palmas.txt new file mode
100644
index 0000000..e4b6910
--- /dev/null
+++ b/Documentation/devicetree/bindings/rtc/rtc-palmas.txt
@@ -0,0 +1,28 @@
+Palmas RTC controller bindings
+
+Required properties:
+- compatible:
+ - "ti,palams-rtc" for palma series of the RTC controller
+- interrupt-parent: Parent interrupt device, must be handle of palams
node. +- interrupts: Interrupt number of RTC submodule on device.
+
+Optional properties:
+- ti,back-bat-chg-enable: The palmas series device like TPS65913 or
TPS80036 + supports the battery backup for powering the RTC when main
battery is + removed or in very low power state. This flag will
enable the backup + battery charging.
+- ti,back-bat-chg-current: Configure charging current. Device
supports the + charging current as < 100mA or >100mA.
Does the HW support just two options; less-than or greater-than 100mA?
If so, a Boolean property here might be better. The code below certainly
implies this.
Yes, it supports the two option, less than 100ma and 100ma. I will
change it to bool.
Given there's only 1 battery, I think "back-" is redundant in the
property names. Since that shortens the names a bit, I'd suggest
spelling everything out in full, perhaps:
battery-charge-enable
battery-charge-low-current
First of all, are those even properties for the RTC binding? Doesn't this
PMIC contain a charger part which handles battery charging and so requires
such kind of information?
There is two appropriate place for enabling battery backup charging
which I can think of, one is in core and other is in RTC driver.
I do not want to new driver for enabling charging as the charger driver.
There is separate charger module on one of palma device which need full
flashed driver.
As this backup battery provides power to the RTC only in absence of main
energy source, I thought of putting this on RTC.
There is no issue to put this piece of code on other palma driver.
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