linux-kernel - Re: [PATCH v5 6/6] ARM: dts: DRA7: Add dt nodes for PWMSS

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Date:	Thu, 17 Mar 2016 10:53:57 -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>, <paul@...an.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>, <vigneshr@...com>
Subject: Re: [PATCH v5 6/6] ARM: dts: DRA7: Add dt nodes for PWMSS



On 03/17/2016 10:11 AM, Rob Herring wrote:
> On Mon, Mar 07, 2016 at 07:23:44PM -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>
>> [fcooper@...com: Add eCAP and use updated bindings for PWMSS and ePWM]
>> Signed-off-by: Franklin S Cooper Jr <fcooper@...com>
>> ---
>> Version 5 changes:
>> Add DT node for eCAP and update eCAP binding documentation
>>
>> Version 4 changes:
>> Updated link to the latest documentation
>>
>>  .../devicetree/bindings/pwm/pwm-tiecap.txt         |  9 +++
>>  .../devicetree/bindings/pwm/pwm-tiehrpwm.txt       |  9 +++
>>  .../devicetree/bindings/pwm/pwm-tipwmss.txt        | 15 +++-
>>  arch/arm/boot/dts/dra7.dtsi                        | 84 ++++++++++++++++++++++
>>  4 files changed, 116 insertions(+), 1 deletion(-)
>
>> +			ehrpwm1: pwm@...40200 {
>> +				compatible = "ti,dra7xx-ehrpwm",
>> +					     "ti,am33xx-ehrpwm";
>> +				#pwm-cells = <3>;
>> +				reg = <0x48440200 0x80>;
>> +				clocks = <&ehrpwm1_tbclk>;
>> +				clock-names = "tbclk";
>> +				status = "disabled";
>> +			};
>> +
>> +			ecap1: ecap@...40100 {
> This also is a PWM? Then it should also be pwm@...

The enhanced capture module primary purpose is to measure
time between external signals which is called capture mode.
It also has a PWM mode. So I wouldn't recommend generalizing
the entire node to pwm.
>
>> +				compatible = "ti,dra7xx-ecap",
>> +					     "ti,am33xx-ecap";
>> +				#pwm-cells = <3>;
>> +				reg = <0x48440100 0x80>;
>> +				status = "disabled";
>> +			};
>> +		};
>> +
>> +		epwmss2: epwmss@...42000 {
>> +			compatible = "ti,dra7xx-pwmss", "ti,am33xx-pwmss";
>> +			reg = <0x48442000 0x30>;
>> +			ti,hwmods = "epwmss2";
>> +			#address-cells = <1>;
>> +			#size-cells = <1>;
>> +			status = "disabled";
>> +			ranges;
>> +
>> +			ehrpwm2: pwm@...42200 {
>> +				compatible = "ti,dra7xx-ehrpwm",
>> +					     "ti,am33xx-ehrpwm";
>> +				#pwm-cells = <3>;
>> +				reg = <0x48442200 0x80>;
>> +				clocks = <&ehrpwm2_tbclk>;
>> +				clock-names = "tbclk";
>> +				status = "disabled";
>> +			};
>> +
>> +			ecap2: ecap@...42100 {
> And here.
>
>> +				compatible = "ti,dra7xx-ecap",
>> +					     "ti,am33xx-ecap";
>> +				#pwm-cells = <3>;
>> +				reg = <0x48442100 0x80>;
>> +				status = "disabled";
>> +			};
>> +		};
>>  	};
>>  
>>  	thermal_zones: thermal-zones {
>> -- 
>> 2.7.0
>>