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

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Date:	Thu, 14 Mar 2013 16:44:23 +0100
From:	Peter Korsgaard <jacmet@...site.dk>
To:	Sekhar Nori <nsekhar@...com>
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

>>>>> "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.

-- 
Bye, Peter Korsgaard
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