linux-kernel - Re: [PATCH RFC 2/5] drm/msm/hdmi: make use of standard gpio properties.

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Message-ID: <20150810132640.GB7302@ulmo.nvidia.com>
Date:	Mon, 10 Aug 2015 15:26:42 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:	dri-devel@...ts.freedesktop.org, robdclark@...il.com,
	David Airlie <airlied@...ux.ie>, linux-kernel@...r.kernel.org,
	Rob Herring <robh+dt@...nel.org>, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH RFC 2/5] drm/msm/hdmi: make use of standard gpio
 properties.

On Mon, Aug 10, 2015 at 02:15:18PM +0100, Srinivas Kandagatla wrote:
> 
> 
> On 10/08/15 13:38, Thierry Reding wrote:
> >On Mon, Aug 10, 2015 at 12:59:34PM +0100, Srinivas Kandagatla wrote:
> >>This patch modifies the driver to support standard gpio properties along
> >>with deprecated properties. This will help us upstream and cleanup the
> >>non-standard properties over the time.
> >>
> >>Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> >>---
> >>  drivers/gpu/drm/msm/hdmi/hdmi.c | 35 +++++++++++++++++++++++++----------
> >>  1 file changed, 25 insertions(+), 10 deletions(-)
> >>
> >>diff --git a/drivers/gpu/drm/msm/hdmi/hdmi.c b/drivers/gpu/drm/msm/hdmi/hdmi.c
> >>index 8145362..e918889 100644
> >>--- a/drivers/gpu/drm/msm/hdmi/hdmi.c
> >>+++ b/drivers/gpu/drm/msm/hdmi/hdmi.c
> >>@@ -339,19 +339,34 @@ static const struct of_device_id dt_match[] = {
> >>  };
> >>
> >>  #ifdef CONFIG_OF
> >>+/* This code will be removed once we move to gpiod based calls */
> >
> >Why don't you do this now instead of duplicating what is essentially
> >already implemented in gpiolib?
> >
> One of the thing that Rob asked in his comments
> (http://www.spinics.net/lists/arm-kernel/msg437675.html) was to retain the
> support for old devices, moving to gpiod ATM would break such devices as
> they are still using legacy gpiolib and its naming.
> 
> 
> If Rob is ok to drop gpio properties which does not have "-gpio" or "-gpios"
> suffix then we can get rid of this function all together.

If you make the switch to gpiod_*() APIs you'll get this for free.
There's really no need for having a duplicate of what gpiod_get()
already does for you.

Thierry

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