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[5/7] add bindings for stm32 IIO timer drivers

Message ID 1479831207-32699-6-git-send-email-benjamin.gaignard@st.com (mailing list archive)
State New, archived
Headers show

Commit Message

Benjamin Gaignard Nov. 22, 2016, 4:13 p.m. UTC
Define bindings for stm32 IIO timer

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com>
---
 .../bindings/iio/timer/stm32-iio-timer.txt         | 33 ++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/timer/stm32-iio-timer.txt

Comments

Lars-Peter Clausen Nov. 22, 2016, 4:53 p.m. UTC | #1
On 11/22/2016 05:13 PM, Benjamin Gaignard wrote:
> Define bindings for stm32 IIO timer
> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com>
> ---
>  .../bindings/iio/timer/stm32-iio-timer.txt         | 33 ++++++++++++++++++++++
>  1 file changed, 33 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/timer/stm32-iio-timer.txt
> 
> diff --git a/Documentation/devicetree/bindings/iio/timer/stm32-iio-timer.txt b/Documentation/devicetree/bindings/iio/timer/stm32-iio-timer.txt
> new file mode 100644
> index 0000000..b80025e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/timer/stm32-iio-timer.txt
> @@ -0,0 +1,33 @@
> +timer IIO trigger bindings for STM32
> +
> +Must be a child of STM32 multifunctions timer driver
> +
> +Required parameters:
> +- compatible: must be one of the follow value:
> +	"st,stm32-iio-timer1"
> +	"st,stm32-iio-timer2"
> +	"st,stm32-iio-timer3"
> +	"st,stm32-iio-timer4"
> +	"st,stm32-iio-timer5"
> +	"st,stm32-iio-timer6"
> +	"st,stm32-iio-timer7"
> +	"st,stm32-iio-timer8"
> +	"st,stm32-iio-timer9"
> +	"st,stm32-iio-timer10"
> +	"st,stm32-iio-timer11"
> +	"st,stm32-iio-timer12"
> +	"st,stm32-iio-timer13"
> +	"st,stm32-iio-timer14"

We can't do this. This is a binding for a driver, not for the hardware.
Benjamin Gaignard Nov. 22, 2016, 5:01 p.m. UTC | #2
[snip]
>> +     "st,stm32-iio-timer5"
>> +     "st,stm32-iio-timer6"
>> +     "st,stm32-iio-timer7"
>> +     "st,stm32-iio-timer8"
>> +     "st,stm32-iio-timer9"
>> +     "st,stm32-iio-timer10"
>> +     "st,stm32-iio-timer11"
>> +     "st,stm32-iio-timer12"
>> +     "st,stm32-iio-timer13"
>> +     "st,stm32-iio-timer14"
>
> We can't do this. This is a binding for a driver, not for the hardware.
>

Unfortunately each instance for the hardware IP have little
differences like which triggers they could accept or size of the
counter register,
and I doesn't have value inside the hardware to distinguish them so
the only way I found is to use compatible.
Lars-Peter Clausen Nov. 22, 2016, 5:02 p.m. UTC | #3
On 11/22/2016 06:01 PM, Benjamin Gaignard wrote:
> [snip]
>>> +     "st,stm32-iio-timer5"
>>> +     "st,stm32-iio-timer6"
>>> +     "st,stm32-iio-timer7"
>>> +     "st,stm32-iio-timer8"
>>> +     "st,stm32-iio-timer9"
>>> +     "st,stm32-iio-timer10"
>>> +     "st,stm32-iio-timer11"
>>> +     "st,stm32-iio-timer12"
>>> +     "st,stm32-iio-timer13"
>>> +     "st,stm32-iio-timer14"
>>
>> We can't do this. This is a binding for a driver, not for the hardware.
>>
> 
> Unfortunately each instance for the hardware IP have little
> differences like which triggers they could accept or size of the
> counter register,
> and I doesn't have value inside the hardware to distinguish them so
> the only way I found is to use compatible.

But IIO is not a piece of hardware, its a software framework in the Linux
kernel.
Lee Jones Nov. 22, 2016, 5:18 p.m. UTC | #4
On Tue, 22 Nov 2016, Benjamin Gaignard wrote:

> [snip]
> >> +     "st,stm32-iio-timer5"
> >> +     "st,stm32-iio-timer6"
> >> +     "st,stm32-iio-timer7"
> >> +     "st,stm32-iio-timer8"
> >> +     "st,stm32-iio-timer9"
> >> +     "st,stm32-iio-timer10"
> >> +     "st,stm32-iio-timer11"
> >> +     "st,stm32-iio-timer12"
> >> +     "st,stm32-iio-timer13"
> >> +     "st,stm32-iio-timer14"
> >
> > We can't do this. This is a binding for a driver, not for the hardware.
> >
> 
> Unfortunately each instance for the hardware IP have little
> differences like which triggers they could accept or size of the
> counter register,
> and I doesn't have value inside the hardware to distinguish them so
> the only way I found is to use compatible.

Can't you represent these as properties?
Benjamin Gaignard Nov. 23, 2016, 8:17 a.m. UTC | #5
If it is ok for you I will add "id" parameter in mfd driver and
forward it to the sub-devices drivers
to be able to distinguish the hardware blocks


2016-11-22 18:18 GMT+01:00 Lee Jones <lee.jones@linaro.org>:
> On Tue, 22 Nov 2016, Benjamin Gaignard wrote:
>
>> [snip]
>> >> +     "st,stm32-iio-timer5"
>> >> +     "st,stm32-iio-timer6"
>> >> +     "st,stm32-iio-timer7"
>> >> +     "st,stm32-iio-timer8"
>> >> +     "st,stm32-iio-timer9"
>> >> +     "st,stm32-iio-timer10"
>> >> +     "st,stm32-iio-timer11"
>> >> +     "st,stm32-iio-timer12"
>> >> +     "st,stm32-iio-timer13"
>> >> +     "st,stm32-iio-timer14"
>> >
>> > We can't do this. This is a binding for a driver, not for the hardware.
>> >
>>
>> Unfortunately each instance for the hardware IP have little
>> differences like which triggers they could accept or size of the
>> counter register,
>> and I doesn't have value inside the hardware to distinguish them so
>> the only way I found is to use compatible.
>
> Can't you represent these as properties?
>
> --
> Lee Jones
> Linaro STMicroelectronics Landing Team Lead
> Linaro.org │ Open source software for ARM SoCs
> Follow Linaro: Facebook | Twitter | Blog
Rob Herring Nov. 28, 2016, 9:44 p.m. UTC | #6
On Wed, Nov 23, 2016 at 09:17:58AM +0100, Benjamin Gaignard wrote:
> If it is ok for you I will add "id" parameter in mfd driver and
> forward it to the sub-devices drivers
> to be able to distinguish the hardware blocks

Please don't top post.

No, it's not okay. If the counter sizes are different, then have a 
property for the counter size. Describe how they are different without 
numbering them. If you can't describe the differences, then it shouldn't 
matter which ones the OS picks to use.

> 2016-11-22 18:18 GMT+01:00 Lee Jones <lee.jones@linaro.org>:
> > On Tue, 22 Nov 2016, Benjamin Gaignard wrote:
> >
> >> [snip]
> >> >> +     "st,stm32-iio-timer5"
> >> >> +     "st,stm32-iio-timer6"
> >> >> +     "st,stm32-iio-timer7"
> >> >> +     "st,stm32-iio-timer8"
> >> >> +     "st,stm32-iio-timer9"
> >> >> +     "st,stm32-iio-timer10"
> >> >> +     "st,stm32-iio-timer11"
> >> >> +     "st,stm32-iio-timer12"
> >> >> +     "st,stm32-iio-timer13"
> >> >> +     "st,stm32-iio-timer14"

I doubt the h/w manual calls these "IIO timers".

> >> >
> >> > We can't do this. This is a binding for a driver, not for the hardware.
> >> >
> >>
> >> Unfortunately each instance for the hardware IP have little
> >> differences like which triggers they could accept or size of the
> >> counter register,
> >> and I doesn't have value inside the hardware to distinguish them so
> >> the only way I found is to use compatible.
> >
> > Can't you represent these as properties?
> >
> > --
> > Lee Jones
> > Linaro STMicroelectronics Landing Team Lead
> > Linaro.org │ Open source software for ARM SoCs
> > Follow Linaro: Facebook | Twitter | Blog
> 
> 
> 
> -- 
> Benjamin Gaignard
> 
> Graphic Study Group
> 
> Linaro.org │ Open source software for ARM SoCs
> 
> Follow Linaro: Facebook | Twitter | Blog
diff mbox

Patch

diff --git a/Documentation/devicetree/bindings/iio/timer/stm32-iio-timer.txt b/Documentation/devicetree/bindings/iio/timer/stm32-iio-timer.txt
new file mode 100644
index 0000000..b80025e
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/timer/stm32-iio-timer.txt
@@ -0,0 +1,33 @@ 
+timer IIO trigger bindings for STM32
+
+Must be a child of STM32 multifunctions timer driver
+
+Required parameters:
+- compatible: must be one of the follow value:
+	"st,stm32-iio-timer1"
+	"st,stm32-iio-timer2"
+	"st,stm32-iio-timer3"
+	"st,stm32-iio-timer4"
+	"st,stm32-iio-timer5"
+	"st,stm32-iio-timer6"
+	"st,stm32-iio-timer7"
+	"st,stm32-iio-timer8"
+	"st,stm32-iio-timer9"
+	"st,stm32-iio-timer10"
+	"st,stm32-iio-timer11"
+	"st,stm32-iio-timer12"
+	"st,stm32-iio-timer13"
+	"st,stm32-iio-timer14"
+
+Example:
+	mfd_timer1: mfdtimer1@40010000 {
+		compatible = "st,stm32-mfd-timer1";
+		reg = <0x40010000 0x400>;
+		clocks = <&rcc 0 160>;
+		clock-names = "mfd_timer_clk";
+		interrupts = <27>;
+
+		trigger1: trigger1@40010000 {
+			compatible = "st,stm32-iio-timer1";
+		};
+	};