On 26 June 2017 19:14:16 BST, Rob Herring [off-list ref] wrote:

On Wed, Jun 21, 2017 at 04:30:12PM +0200, Fabrice Gasnier wrote:

quoted

Add documentation for STMicroelectronics STM32 Low-Power Timer

Trigger

quoted

binding.

Signed-off-by: Fabrice Gasnier <redacted>
---
Changes in v2:
- s/Low Power/Low-Power
- remove leading 0x in example (parent node)
- improve reg property description
---
 .../bindings/iio/timer/stm32-lptimer-trigger.txt   | 23

++++++++++++++++++++++

quoted

 1 file changed, 23 insertions(+)
 create mode 100644

Documentation/devicetree/bindings/iio/timer/stm32-lptimer-trigger.txt

quoted

diff --git

a/Documentation/devicetree/bindings/iio/timer/stm32-lptimer-trigger.txt
b/Documentation/devicetree/bindings/iio/timer/stm32-lptimer-trigger.txt

quoted

new file mode 100644
index 0000000..466d99f

--- /dev/null
+++

b/Documentation/devicetree/bindings/iio/timer/stm32-lptimer-trigger.txt

quoted

@@ -0,0 +1,23 @@
+STMicroelectronics STM32 Low-Power Timer Trigger
+
+STM32 Low-Power Timer provides trigger source (LPTIM output) that

can be used

quoted

+by STM32 internal ADC and/or DAC.
+
+Must be a sub-node of an STM32 Low-Power Timer device tree node.
+See ../mfd/stm32-lptimer.txt for details about the parent node.
+
+Required properties:
+- compatible:		Must be "st,stm32-lptimer-trigger".
+- reg:			Selects trigger hardware block. Must be 0, 1 or 2
+			respectively for lptimer1, lptimer2 or lptimer3
+			trigger output.

I guess this answers my question. However, this seems like abuse of the

reg prop. This should not be how you select a trigger. The DT should 
describe all the h/w blocks and then the adc connection is a separate 
property.

I think this is miss described. Reg is labelling instances of the hardware block which is providing the trigger.

The connection to an ADC etc is done from userspace.

Rob
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