From: Mark Brown <broonie@kernel.org>
To: Andrzej Hajda <a.hajda@samsung.com>
Cc: Jeffrey Hugo <jeffrey.l.hugo@gmail.com>,
Laurent.pinchart@ideasonboard.com, airlied@linux.ie,
daniel@ffwll.ch, robdclark@gmail.com, bjorn.andersson@linaro.org,
dri-devel@lists.freedesktop.org, linux-arm-msm@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2] regmap: Add DSI bus support
Date: Thu, 11 Jul 2019 15:50:45 +0100 [thread overview]
Message-ID: <20190711145045.GI14859@sirena.co.uk> (raw)
In-Reply-To: <64ca3a74-374f-d4f3-bee6-a607cc5c0fc5@samsung.com>
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On Thu, Jul 11, 2019 at 03:11:56PM +0200, Andrzej Hajda wrote:
> 1. DSI protocol defines actually more than 30 types of transactions[1],
> but this patchset implements only few of them (dsi generic write/read
> family). Is it possible to implement multiple types of transactions in
> regmap?
You can, there's a couple of different ways depending on how
exactly things are done.
> 3. DSI devices are no MFDs so regmap abstraction has no big value added
> (correct me, if there are other significant benefits).
There's a few extra bits even if you're not using the marshalling
code to get things onto the bus - the main ones are the register
cache support (which people often use for simpler suspend/resume
support) and the debug and trace facilities (things like
tracepoints and debugfs for dumping the register map). There's
no real connection to MFDs, I'd say the majority of users are not
MFDs.
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WARNING: multiple messages have this Message-ID (diff)
From: Mark Brown <broonie@kernel.org>
To: Andrzej Hajda <a.hajda@samsung.com>
Cc: Jeffrey Hugo <jeffrey.l.hugo@gmail.com>,
airlied@linux.ie, linux-arm-msm@vger.kernel.org,
linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
bjorn.andersson@linaro.org, Laurent.pinchart@ideasonboard.com
Subject: Re: [PATCH 1/2] regmap: Add DSI bus support
Date: Thu, 11 Jul 2019 15:50:45 +0100 [thread overview]
Message-ID: <20190711145045.GI14859@sirena.co.uk> (raw)
In-Reply-To: <64ca3a74-374f-d4f3-bee6-a607cc5c0fc5@samsung.com>
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On Thu, Jul 11, 2019 at 03:11:56PM +0200, Andrzej Hajda wrote:
> 1. DSI protocol defines actually more than 30 types of transactions[1],
> but this patchset implements only few of them (dsi generic write/read
> family). Is it possible to implement multiple types of transactions in
> regmap?
You can, there's a couple of different ways depending on how
exactly things are done.
> 3. DSI devices are no MFDs so regmap abstraction has no big value added
> (correct me, if there are other significant benefits).
There's a few extra bits even if you're not using the marshalling
code to get things onto the bus - the main ones are the register
cache support (which people often use for simpler suspend/resume
support) and the debug and trace facilities (things like
tracepoints and debugfs for dumping the register map). There's
no real connection to MFDs, I'd say the majority of users are not
MFDs.
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next prev parent reply other threads:[~2019-07-11 14:50 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-03 21:43 [PATCH 0/2] ti-sn65dsi86 DSI configuration support Jeffrey Hugo
2019-07-03 21:43 ` Jeffrey Hugo
2019-07-03 21:45 ` [PATCH 1/2] regmap: Add DSI bus support Jeffrey Hugo
2019-07-06 1:06 ` Mark Brown
2019-07-06 1:06 ` Mark Brown
2019-07-10 18:08 ` Jeffrey Hugo
2019-07-11 14:41 ` Mark Brown
2019-07-11 13:11 ` Andrzej Hajda
2019-07-11 13:11 ` Andrzej Hajda
2019-07-11 13:56 ` Rob Clark
2019-07-12 13:01 ` Andrzej Hajda
2019-07-12 14:22 ` Jeffrey Hugo
2019-07-13 0:49 ` Rob Clark
2019-07-13 0:49 ` Rob Clark
2019-07-11 14:50 ` Mark Brown [this message]
2019-07-11 14:50 ` Mark Brown
2019-07-15 8:38 ` Andrzej Hajda
2019-07-03 21:45 ` [PATCH 2/2] drm/bridge: ti-sn65dsi86: Add support to be a DSI device Jeffrey Hugo
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