From: Antti Palosaari <crope@iki.fi>
To: Steven Toth <stoth@kernellabs.com>
Cc: linux-media <linux-media@vger.kernel.org>
Subject: Re: GPIO interface between DVB sub-drivers (bridge, demod, tuner)
Date: Fri, 20 Jul 2012 04:43:12 +0300 [thread overview]
Message-ID: <5008B7B0.1020602@iki.fi> (raw)
In-Reply-To: <CALzAhNUmdcd7cE-fcMHJsNk1rTcKXoZR9Oyu+5XciNZQ57EBGQ@mail.gmail.com>
On 07/13/2012 12:07 AM, Steven Toth wrote:
> On Thu, Jul 12, 2012 at 4:49 PM, Steven Toth <stoth@kernellabs.com> wrote:
>> Nobody understands the relationship between the bridge and the
>> sub-component as well as the bridge driver. The current interfaces are
>> limiting in many ways. We solve that today with rather ugly 'attach'
>> structures that are inflexible, for example to set gpios to a default state.
>> Then, once that interface is attached, the bridge effectively loses most of
>> the control to the tuner and/or demod. The result is a large disconnect
>> between the bridge and subcomponents.
>>
>> Why limit any interface extension to GPIOs? Why not make something a
>> little more flexible so we can pass custom messages around?
>> What did you ever decide about the enable/disable of the LNA? And, how
>> would the bridge do that in your proposed solution? Via the proposed GPIO
>> interface?
GPIO / LNA is ready, see following patches:
add LNA support for DVB API
cxd2820r: use Kernel GPIO for GPIO access
em28xx: implement FE set_lna() callback
from:
http://git.linuxtv.org/anttip/media_tree.git/shortlog/refs/heads/dvb_core
Kernel GPIOs were quite easy to implement and use - when needed
knowledge was gathered after all the testing and study. I wonder why
none was done that earlier for DVB...
It also offer nice debug/devel feature as you can mount those GPIOs via
sysfs and use directly.
Next-step: DVB power management.
regards
Antti
--
http://palosaari.fi/
next prev parent reply other threads:[~2012-07-20 1:43 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-12 20:24 GPIO interface between DVB sub-drivers (bridge, demod, tuner) Antti Palosaari
[not found] ` <CALzAhNVwN3TJhn-3i9SDhKfk=tvZZ49RTKkUzWC8RZ_m=v=A+w@mail.gmail.com>
2012-07-12 21:07 ` Steven Toth
2012-07-13 1:13 ` Antti Palosaari
2012-07-13 13:16 ` Steven Toth
2012-07-18 0:22 ` Antti Palosaari
2012-07-20 1:43 ` Antti Palosaari [this message]
2012-07-29 21:21 ` poma
2012-07-30 7:39 ` Antti Palosaari
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