linux-kernel - Re: [PATCH 2/3] pwm: pwm-tiecap: Add device-tree binding support for da850 SOC

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Date:	Fri, 15 Mar 2013 09:55:57 +0530
From:	Sekhar Nori <nsekhar@...com>
To:	Peter Korsgaard <jacmet@...site.dk>
CC:	Philip Avinash <avinashphilip@...com>,
	<davinci-linux-open-source@...ux.davincidsp.com>,
	<linux-doc@...r.kernel.org>, <devicetree-discuss@...ts.ozlabs.org>,
	<linux-kernel@...r.kernel.org>,
	Rob Herring <rob.herring@...xeda.com>, <prakash.pm@...com>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 2/3] pwm: pwm-tiecap: Add device-tree binding support
 for da850 SOC

On 3/14/2013 9:14 PM, Peter Korsgaard wrote:
>>>>>> "Sekhar" == Sekhar Nori <nsekhar@...com> writes:
> 
>  >> Required properties:
>  >> -- compatible: Must be "ti,am33xx-ecap"
>  >> +- compatible: Must be "ti,am33xx-ecap" or "ti,da850-ecap"
>  >> - #pwm-cells: Should be 3. Number of cells being used to specify PWM property.
>  >> First cell specifies the per-chip index of the PWM to use, the second
>  >> cell is the period in nanoseconds and bit 0 in the third cell is used to
>  >> diff --git a/drivers/pwm/pwm-tiecap.c b/drivers/pwm/pwm-tiecap.c
>  >> index 22e96e2..e0d96c8 100644
>  >> --- a/drivers/pwm/pwm-tiecap.c
>  >> +++ b/drivers/pwm/pwm-tiecap.c
>  >> @@ -197,6 +197,7 @@ static const struct pwm_ops ecap_pwm_ops = {
>  >> 
>  >> static const struct of_device_id ecap_of_match[] = {
>  >> { .compatible	= "ti,am33xx-ecap" },
>  >> +	{ .compatible	= "ti,da850-ecap" },
>  >> {},
> 
>  Sekhar> You add a new compatible, but don't really show any changes in
>  Sekhar> driver in this series. So why can't we simply use
>  Sekhar> ti,am33xx-ecap on DA850 too?
> 
> Indeed, if the hardware block is identical the dts should simply list:
> 
> compatible = "ti,da850-ecap", "ti,am33xx-ecap"
> 
> And the driver only bind to ti,am33xx-ecap (unless there ever needs to
> be a da850 specific workarounde.

Okay, so this is to future proof the DA850 DT blob. Makes sense. Thanks!

~Sekhar
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