From: Jani Nikula <jani.nikula@linux.intel.com>
To: Thierry Reding <treding@nvidia.com>,
Lucas Stach <l.stach@pengutronix.de>
Cc: linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
dri-devel@lists.freedesktop.org, a.hajda@samsung.com
Subject: Re: [RFC 0/2] drm/dsi: DSI for devices with different control bus
Date: Wed, 19 Aug 2015 18:39:30 +0300 [thread overview]
Message-ID: <87d1yj9tjh.fsf@intel.com> (raw)
In-Reply-To: <20150819150207.GJ15607@ulmo.nvidia.com>
On Wed, 19 Aug 2015, Thierry Reding <treding@nvidia.com> wrote:
> On Wed, Aug 19, 2015 at 04:52:24PM +0200, Lucas Stach wrote:
>> Am Mittwoch, den 19.08.2015, 16:34 +0200 schrieb Thierry Reding:
>> > I think that's a flawed interpretation of what's going on here. The
>> > device in fact has two interfaces: one is I2C, the other is DSI. In my
>> > opinion that's reason enough to represent it as two logical devices.
>> >
>> Does it really have 2 control interfaces that are used at the same time?
>> Or is the DSI connection a passive data bus if the register control
>> happens through i2c?
>
> The interfaces may not be used at the same time, and the DSI interface
> may even be crippled, but the device is still addressable from the DSI
> host controller, if for nothing else than for routing the video stream.
As a drive-by comment, the Toshiba TC358764XBG/65XBG chip can be
configured via both DSI and I2C. The I2C interface requires DSI clock on
the DSI interface to operate. You may not use the interfaces
simultaneously, but provided you protect against races in register
access, both interfaces can be operational at the same time.
Sorry I couldn't find a public spec of the chip to share.
HTH,
Jani.
--
Jani Nikula, Intel Open Source Technology Center
next prev parent reply other threads:[~2015-08-19 15:39 UTC|newest]
Thread overview: 144+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-30 5:24 [RFC 0/2] drm/dsi: DSI for devices with different control bus Archit Taneja
2015-06-30 5:24 ` [RFC 1/2] drm/dsi: Create dummy DSI devices Archit Taneja
2015-06-30 5:24 ` Archit Taneja
2015-08-19 8:10 ` Andrzej Hajda
2015-08-19 8:10 ` Andrzej Hajda
2015-08-19 9:30 ` Archit Taneja
2015-06-30 5:24 ` [RFC 2/2] drm/dsi: Get DSI host by DT device node Archit Taneja
2015-06-30 5:24 ` Archit Taneja
2015-08-19 8:46 ` Andrzej Hajda
2015-08-19 8:46 ` Andrzej Hajda
2015-08-19 5:07 ` [RFC 0/2] drm/dsi: DSI for devices with different control bus Archit Taneja
2015-08-19 13:13 ` Thierry Reding
2015-08-19 13:13 ` Thierry Reding
2015-08-19 14:17 ` Lucas Stach
2015-08-19 14:34 ` Thierry Reding
2015-08-19 14:34 ` Thierry Reding
2015-08-19 14:52 ` Lucas Stach
2015-08-19 14:52 ` Lucas Stach
2015-08-19 15:02 ` Thierry Reding
2015-08-19 15:02 ` Thierry Reding
2015-08-19 15:39 ` Jani Nikula [this message]
2015-08-20 4:16 ` Archit Taneja
2015-08-20 11:48 ` Thierry Reding
2015-08-20 11:48 ` Thierry Reding
2015-08-21 6:09 ` Archit Taneja
2015-08-21 6:09 ` Archit Taneja
2015-09-07 11:46 ` Archit Taneja
2015-09-07 11:46 ` Archit Taneja
2015-09-08 10:27 ` Andrzej Hajda
2015-09-10 6:15 ` Archit Taneja
2015-09-10 6:15 ` Archit Taneja
2015-09-10 7:32 ` Thierry Reding
2015-09-10 7:32 ` Thierry Reding
2015-09-15 10:32 ` Archit Taneja
2015-09-15 10:32 ` Archit Taneja
2015-09-15 15:43 ` Rob Herring
2015-09-17 8:56 ` Archit Taneja
2015-09-15 10:41 ` Archit Taneja
2015-09-15 10:41 ` Archit Taneja
2015-10-06 9:24 ` [RFC v2 0/5] " Archit Taneja
2015-10-06 9:24 ` [RFC v2 1/5] drm/dsi: Refactor device creation Archit Taneja
2015-10-06 9:24 ` Archit Taneja
2015-10-30 11:28 ` Andrzej Hajda
2015-10-30 11:28 ` Andrzej Hajda
2015-10-06 9:24 ` [RFC v2 2/5] drm/dsi: Try to match non-DT dsi devices Archit Taneja
2015-10-06 9:24 ` Archit Taneja
2015-10-30 12:42 ` Andrzej Hajda
2015-10-30 12:42 ` Andrzej Hajda
2015-11-02 5:26 ` Archit Taneja
2015-11-02 5:26 ` Archit Taneja
2015-10-06 9:24 ` [RFC v2 3/5] drm/dsi: Check for used channels Archit Taneja
2015-10-06 9:24 ` Archit Taneja
2015-10-30 12:52 ` Andrzej Hajda
2015-11-02 5:28 ` Archit Taneja
2015-11-02 5:28 ` Archit Taneja
2015-10-06 9:24 ` [RFC v2 4/5] drm/dsi: Add routine to unregister dsi device Archit Taneja
2015-10-06 9:24 ` Archit Taneja
2015-10-30 14:21 ` Andrzej Hajda
2015-10-30 14:21 ` Andrzej Hajda
2015-11-02 6:28 ` Archit Taneja
2015-11-02 10:42 ` Andrzej Hajda
2015-11-03 7:18 ` Archit Taneja
2015-10-06 9:24 ` [RFC v2 5/5] drm/dsi: Get DSI host by DT device node Archit Taneja
2015-10-06 9:24 ` Archit Taneja
2015-10-06 10:00 ` kbuild test robot
2015-10-06 10:00 ` kbuild test robot
2015-11-02 10:50 ` Andrzej Hajda
2015-11-02 10:50 ` Andrzej Hajda
2015-11-03 7:20 ` Archit Taneja
2015-11-03 7:20 ` Archit Taneja
2015-11-30 12:01 ` [PATCH v3 0/5] drm/dsi: DSI for devices with different control bus Archit Taneja
2015-11-30 12:01 ` [PATCH v3 1/5] drm/dsi: Refactor device creation Archit Taneja
2015-11-30 12:01 ` Archit Taneja
2015-11-30 12:01 ` [PATCH v3 2/5] drm/dsi: Try to match non-DT dsi devices Archit Taneja
2015-11-30 12:01 ` Archit Taneja
2015-11-30 12:45 ` kbuild test robot
2015-11-30 12:45 ` kbuild test robot
2015-12-07 5:29 ` Archit Taneja
2015-12-07 8:45 ` Jani Nikula
2015-12-07 8:59 ` Archit Taneja
2015-12-07 8:59 ` Archit Taneja
2015-12-07 9:10 ` Jani Nikula
2015-12-07 9:10 ` Jani Nikula
2015-12-07 9:18 ` Archit Taneja
2015-12-07 10:07 ` Jani Nikula
2015-12-07 16:55 ` Rob Clark
2015-11-30 12:01 ` [PATCH v3 3/5] drm/dsi: Check for used channels Archit Taneja
2015-11-30 12:01 ` Archit Taneja
2015-11-30 12:01 ` [PATCH v3 4/5] drm/dsi: Add routine to unregister dsi device Archit Taneja
2015-11-30 12:01 ` Archit Taneja
2015-11-30 12:34 ` Andrzej Hajda
2015-11-30 12:34 ` Andrzej Hajda
2015-11-30 12:01 ` [PATCH v3 5/5] drm/dsi: Get DSI host by DT device node Archit Taneja
2015-11-30 12:01 ` Archit Taneja
2015-12-10 12:41 ` [PATCH v4 0/6] drm/dsi: DSI for devices with different control bus Archit Taneja
2015-12-10 12:41 ` [PATCH v4 1/6] drm/dsi: check for CONFIG_OF when defining of_mipi_dsi_device_add Archit Taneja
2015-12-10 12:41 ` Archit Taneja
2016-01-21 15:31 ` Thierry Reding
2016-01-21 15:31 ` Thierry Reding
2016-01-26 14:59 ` Archit Taneja
2016-01-26 14:59 ` Archit Taneja
2015-12-10 12:41 ` [PATCH v4 2/6] drm/dsi: Refactor device creation Archit Taneja
2016-01-21 15:46 ` Thierry Reding
2016-01-21 15:46 ` Thierry Reding
2016-01-26 17:05 ` Archit Taneja
2016-01-26 17:05 ` Archit Taneja
2015-12-10 12:41 ` [PATCH v4 3/6] drm/dsi: Try to match non-DT dsi devices Archit Taneja
2015-12-10 12:41 ` Archit Taneja
2016-01-21 16:05 ` Thierry Reding
2016-01-21 16:05 ` Thierry Reding
2016-01-26 18:04 ` Archit Taneja
2016-01-26 18:04 ` Archit Taneja
2015-12-10 12:41 ` [PATCH v4 4/6] drm/dsi: Check for used channels Archit Taneja
2015-12-10 12:41 ` Archit Taneja
2016-01-21 16:11 ` Thierry Reding
2016-01-21 16:11 ` Thierry Reding
2016-01-27 5:16 ` Archit Taneja
2016-01-27 5:16 ` Archit Taneja
2015-12-10 12:41 ` [PATCH v4 5/6] drm/dsi: Add routine to unregister dsi device Archit Taneja
2015-12-10 12:41 ` Archit Taneja
2016-01-21 16:12 ` Thierry Reding
2016-01-21 16:12 ` Thierry Reding
2016-01-27 5:20 ` Archit Taneja
2015-12-10 12:41 ` [PATCH v4 6/6] drm/dsi: Get DSI host by DT device node Archit Taneja
2015-12-10 12:41 ` Archit Taneja
2016-01-21 16:16 ` Thierry Reding
2016-01-21 16:16 ` Thierry Reding
2016-01-27 5:21 ` Archit Taneja
2016-01-27 5:21 ` Archit Taneja
2016-01-05 5:29 ` [PATCH v4 0/6] drm/dsi: DSI for devices with different control bus Archit Taneja
2016-02-12 9:18 ` [PATCH v5 0/5] " Archit Taneja
2016-02-12 9:18 ` Archit Taneja
2016-02-12 9:18 ` [PATCH v5 1/5] drm/dsi: check for CONFIG_OF when defining of_mipi_dsi_device_add Archit Taneja
2016-02-12 9:18 ` Archit Taneja
2016-02-12 9:18 ` [PATCH v5 2/5] drm/dsi: Use mipi_dsi_device_register_full for DSI device creation Archit Taneja
2016-02-12 9:18 ` Archit Taneja
2016-02-12 9:18 ` [PATCH v5 3/5] drm/dsi: Try to match non-DT DSI devices Archit Taneja
2016-02-12 9:18 ` Archit Taneja
2016-02-12 9:18 ` [PATCH v5 4/5] drm/dsi: Add routine to unregister a DSI device Archit Taneja
2016-02-12 9:18 ` Archit Taneja
2016-02-12 9:18 ` [PATCH v5 5/5] drm/dsi: Get DSI host by DT device node Archit Taneja
2016-02-12 9:18 ` Archit Taneja
2016-03-02 16:05 ` [PATCH v5 0/5] drm/dsi: DSI for devices with different control bus Thierry Reding
2016-03-02 16:05 ` Thierry Reding
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