linux-kernel - Re: [PATCH 5/5] pwm: pwm-tiehrpwm: Update dt binding document to use generic node name

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Date:	Thu, 17 Mar 2016 11:49:24 -0500
From:	"Franklin S Cooper Jr." <fcooper@...com>
To:	Rob Herring <robh@...nel.org>
CC:	<thierry.reding@...il.com>, <pawel.moll@....com>,
	<mark.rutland@....com>, <ijc+devicetree@...lion.org.uk>,
	<galak@...eaurora.org>, <bcousson@...libre.com>,
	<tony@...mide.com>, <linux@....linux.org.uk>, <t-kristo@...com>,
	<mturquette@...libre.com>, <sboyd@...eaurora.org>,
	<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 5/5] pwm: pwm-tiehrpwm: Update dt binding document to use
 generic node name



On 03/17/2016 10:03 AM, Rob Herring wrote:
> On Mon, Mar 07, 2016 at 01:51:58PM -0600, Franklin S Cooper Jr wrote:
>> Now that the node name has been changed from ehrpwm to pwm the document
>> should show this proper usage. Also change the unit address in the example
>> from 0 to the proper physical address value that should be used.
>>
>> Signed-off-by: Franklin S Cooper Jr <fcooper@...com>
>> ---
>>  Documentation/devicetree/bindings/pwm/pwm-tiehrpwm.txt | 4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/pwm/pwm-tiehrpwm.txt b/Documentation/devicetree/bindings/pwm/pwm-tiehrpwm.txt
>> index 9c100b2..20211ed 100644
>> --- a/Documentation/devicetree/bindings/pwm/pwm-tiehrpwm.txt
>> +++ b/Documentation/devicetree/bindings/pwm/pwm-tiehrpwm.txt
>> @@ -15,14 +15,14 @@ Optional properties:
>>  
>>  Example:
>>  
>> -ehrpwm0: ehrpwm@0 { /* EHRPWM on am33xx */
>> +ehrpwm0: pwm@...00200 { /* EHRPWM on am33xx */
>>  	compatible = "ti,am33xx-ehrpwm";
>>  	#pwm-cells = <3>;
>>  	reg = <0x48300200 0x100>;
>>  	ti,hwmods = "ehrpwm0";
>>  };
>>  
>> -ehrpwm0: ehrpwm@0 { /* EHRPWM on da850 */
>> +ehrpwm0: pwm@...00000 { /* EHRPWM on da850 */
> No leading 0s, but more importantly the address is wrong.

I will remove the leading 0. However, this value was taken
from the .dtsi and I just double checked and I see the same
value in the datasheet. I believe DA850,OMAP-L138 and AM18x
all have the same memory mapping. I'm looking at
http://www.ti.com/lit/ds/symlink/am1808.pdf page 233 and the
addresses match up what is seen here and in the .dtsi.

Can you point me to which document your looking at that
shows a different value?


>
>>  	compatible = "ti,da850-ehrpwm", "ti,am33xx-ehrpwm";
>>  	#pwm-cells = <3>;
>>  	reg = <0x300000 0x2000>;
>> -- 
>> 2.7.0
>>