linux-kernel - Re: [PATCH v3 5/5] ARM: dts: DRA7: Add dt nodes for PWMSS

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Date:	Thu, 3 Mar 2016 19:39:22 -0600
From:	"Franklin S Cooper Jr." <fcooper@...com>
To:	Rob Herring <robh@...nel.org>
CC:	<paul@...an.com>, <t-kristo@...com>, <tony@...mide.com>,
	<vigneshr@...com>, <linux-pwm@...r.kernel.org>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-clk@...r.kernel.org>
Subject: Re: [PATCH v3 5/5] ARM: dts: DRA7: Add dt nodes for PWMSS

Hi Rob,

On 03/02/2016 12:26 PM, Rob Herring wrote:
> On Thu, Feb 25, 2016 at 04:36:36PM -0600, Franklin S Cooper Jr wrote:
>> From: Vignesh R <vigneshr@...com>
>>
>> Add PWMSS device tree nodes for DRA7 SoC family and add documentation
>> for dt bindings.
>>
>> Signed-off-by: Vignesh R <vigneshr@...com>
>> ---
>> Version 3 changes:
>> None
>>
>>  .../devicetree/bindings/pwm/pwm-tiehrpwm.txt       |  8 +++
>>  .../devicetree/bindings/pwm/pwm-tipwmss.txt        | 17 +++++-
>>  arch/arm/boot/dts/dra7.dtsi                        | 64 ++++++++++++++++++++++
>>  3 files changed, 88 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/devicetree/bindings/pwm/pwm-tiehrpwm.txt b/Documentation/devicetree/bindings/pwm/pwm-tiehrpwm.txt
>> index 9c100b2..25d91ae 100644
>> --- a/Documentation/devicetree/bindings/pwm/pwm-tiehrpwm.txt
>> +++ b/Documentation/devicetree/bindings/pwm/pwm-tiehrpwm.txt
>> @@ -4,6 +4,7 @@ Required properties:
>>  - compatible: Must be "ti,<soc>-ehrpwm".
>>    for am33xx - compatible = "ti,am33xx-ehrpwm";
>>    for da850  - compatible = "ti,da850-ehrpwm", "ti,am33xx-ehrpwm";
>> +  for dra7xx - compatible = "ti,dra7xx-ehrpwm", "ti,am33xx-ehrpwm";
> We're starting to push back on wildcards in compatible strings. I guess 
> this is okay...
>
>>  - #pwm-cells: should be 3. See pwm.txt in this directory for a description of
>>    the cells format. The only third cell flag supported by this binding is
>>    PWM_POLARITY_INVERTED.
>> @@ -27,3 +28,10 @@ ehrpwm0: ehrpwm@0 { /* EHRPWM on da850 */
>>  	#pwm-cells = <3>;
>>  	reg = <0x300000 0x2000>;
>>  };
>> +
>> +ehrpwm0: ehrpwm@0 { /* EHRPWM on dra7xx */
> Should be pwm@...40200

So the AM335x, AM437x  and DA850 all use ehrpwm0:
ehrpwm@<address>. Also the address of 0 simply follows the
pattern used in the other binding examples in that doc. I
can replace the 0 address in this patch and make another
patch that fixes it for the other examples in that file. But
in terms of switching from ehrpwm0:ehrpwm@<address> to
ehrpwm0:pwm@<address> that would also require making changes
to the various dtsis also. So is it worth making that
change? If so I have no problem doing it.
>
>> +	compatible = "ti,dra7xx-ehrpwm", "ti,am33xx-ehrpwm";
>> +	#pwm-cells = <3>;
>> +	reg = <0x48440200 0x80>;
>> +	ti,hwmods = "ehrpwm0";
>> +};