linux-kernel - Re: [PATCH v2] pwm: kconfig: enable kona pwm to be built for cygnus arch

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Date:   Thu, 22 Nov 2018 21:05:36 +0100
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     Clément Péron <peron.clem@...il.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com, linux-pwm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] pwm: kconfig: enable kona pwm to be built for cygnus
 arch

Hello Clément,

On Wed, Nov 21, 2018 at 01:35:08PM +0100, Clément Péron wrote:
> The Cygnus architecture use a Kona PWM. This is already present
> in the device tree but can't be built actually. Hence, allow the
> Kona PWM to be built for Cygnus arch.
> 
> Signed-off-by: Clément Péron <peron.clem@...il.com>
> ---
>  drivers/pwm/Kconfig | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
> index 27e5dd47a01f..982f4059f4e8 100644
> --- a/drivers/pwm/Kconfig
> +++ b/drivers/pwm/Kconfig
> @@ -88,7 +88,9 @@ config PWM_BCM_IPROC
>  
>  config PWM_BCM_KONA
>  	tristate "Kona PWM support"
> -	depends on ARCH_BCM_MOBILE
> +	depends on ARCH_BCM_MOBILE || ARCH_BCM_CYGNUS || COMPILE_TEST
> +	depends on HAVE_CLK && HAS_IOMEM
> +	default ARCH_BCM_CYGNUS

This looks good. As pointed out before the default is a bit strange
and could include ARCH_BCM_MOBILE for symmetry.

Anyhow:

Acked-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>

Related to this driver I have a set of questions: If the disable
callback completed, does the hardware still drive the pin? If yes, would
it be possible to disable the pin driver such that the pin gets high-Z?
If yes, how?

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |