linux-kernel - Re: [PATCH 1/3] pwm: davinci: Add Kconfig support for ECAP & EHRPWM devices

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Message-ID: <5141B6D8.2050308@ti.com>
Date:	Thu, 14 Mar 2013 17:09:04 +0530
From:	Sekhar Nori <nsekhar@...com>
To:	Philip Avinash <avinashphilip@...com>
CC:	<thierry.reding@...onic-design.de>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>,
	<davinci-linux-open-source@...ux.davincidsp.com>,
	<prakash.pm@...com>, <devicetree-discuss@...ts.ozlabs.org>,
	<linux-doc@...r.kernel.org>
Subject: Re: [PATCH 1/3] pwm: davinci: Add Kconfig support for ECAP & EHRPWM
 devices

On 3/14/2013 4:02 PM, Philip Avinash wrote:
> Add EHRPWM and ECAP support build support for DAVINCI_DA850 platforms.
> 
> Also, since DAVINCI platforms doesn't support TI-PWM-Subsystem module,
> remove the select option for CONFIG_PWM_TIPWMSS.
> 
> Also, update CONFIG_PWM_TIPWMSS compiler directive appropriately in
> pwm-tipwmss.h to fix the below compiler error upon removal of
> CONFIG_PWM_TIPWMSS for Davinci platforms.
> 
> 	drivers/pwm/pwm-tiecap.c: In function 'ecap_pwm_probe':
> 	drivers/pwm/pwm-tiecap.c:263:4: error: 'PWMSS_ECAPCLK_EN' undeclared
> 	(first use in this function)
> 	drivers/pwm/pwm-tiecap.c:263:4: note: each undeclared identifier
> 	is reported only once for each function it appears in
> 	drivers/pwm/pwm-tiecap.c:264:17: error: 'PWMSS_ECAPCLK_EN_ACK'
> 	undeclared (first use in this function)
> 	drivers/pwm/pwm-tiecap.c: In function 'ecap_pwm_remove':
> 	drivers/pwm/pwm-tiecap.c:291:49: error: 'PWMSS_ECAPCLK_STOP_REQ'
> 	undeclared (first use in this function)
> 	make[2]: *** [drivers/pwm/pwm-tiecap.o] Error 1
> 	make[1]: *** [drivers/pwm] Error 2
> 	make: *** [drivers] Error 2
> 
> Signed-off-by: Philip Avinash <avinashphilip@...com>

>  config  PWM_TIECAP
>  	tristate "ECAP PWM support"
> -	depends on SOC_AM33XX
> -	select PWM_TIPWMSS
> +	depends on SOC_AM33XX || ARCH_DAVINCI_DA850

Having such narrow dependencies is wrong. The same device is present on
DaVinci DA830 too. A depends on should not be required at all since the
driver should build on all architectures. But I have seen resistance to
doing that since users don't like to see configuration options totally
irrelevant for the architecture they are building for. So may be take a
middle path and do 'depends on ARCH_ARM'?

Thanks,
Sekhar
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