From: swarren@wwwdotorg•org (Stephen Warren)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH v3 0/8] Reset controller API to reset IP modules on i.MX5 and i.MX6
Date: Tue, 19 Feb 2013 14:23:08 -0700 [thread overview]
Message-ID: <5123ED3C.3080900@wwwdotorg.org> (raw)
In-Reply-To: <1361273732-23357-1-git-send-email-p.zabel@pengutronix.de>
On 02/19/2013 04:35 AM, Philipp Zabel wrote:
> The system reset controller (SRC) on i.MX51, i.MX53, and i.MX6q controls
> reset lines to the GPU, VPU, IPU, and OpenVG IP modules.
>
> The following patches add a simple API for devices to request being reset
> by separate reset controller hardware and implements the reset signal
> device tree binding proposed by Stephen Warren. Contrary to Tegra hardware,
> the i.MX SRC contains self-deasserting reset registers, so I've included
> both ops to manually assert/deassert a reset line, as well as a "reset"
> operation that is supposed to assert the reset line and wait for it to
> deassert.
One note here: Even though Tegra HW doesn't have auto-clear reset
hardware, I'd still tend to prefer that most Tegra drivers use a single
"assert then deassert" API to keep knowledge of the reset mechanisms out
of the individual drivers. Our reset driver would manually assert, sleep
a short time, de-assert within the implementation. Still, a few drivers
do need a bit more control (e.g. PCIe and powergating) so having the
other APIs around is useful too.
prev parent reply other threads:[~2013-02-19 21:23 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-19 11:35 [PATCH v3 0/8] Reset controller API to reset IP modules on i.MX5 and i.MX6 Philipp Zabel
2013-02-19 11:35 ` [PATCH v3 1/8] dt: describe base reset signal binding Philipp Zabel
2013-02-19 11:35 ` [PATCH v3 2/8] reset: Add reset controller API Philipp Zabel
2013-02-19 21:39 ` Stephen Warren
2013-02-20 11:04 ` Philipp Zabel
2013-02-20 17:10 ` Stephen Warren
2013-02-20 2:20 ` Shawn Guo
2013-02-19 11:35 ` [PATCH v3 3/8] ARM i.MX6q: Add GPU, VPU, IPU, and OpenVG resets to System Reset Controller (SRC) Philipp Zabel
2013-02-19 21:41 ` Stephen Warren
2013-02-19 11:35 ` [PATCH v3 4/8] ARM i.MX6q: Link system reset controller (SRC) to IPU in DT Philipp Zabel
2013-02-19 11:35 ` [PATCH v3 5/8] staging: drm/imx: Use SRC to reset IPU Philipp Zabel
2013-02-19 11:35 ` [PATCH v3 6/8] ARM i.MX5: Add System Reset Controller (SRC) support for i.MX51 and i.MX53 Philipp Zabel
2013-02-19 11:35 ` [PATCH v3 7/8] ARM i.MX5: Add system reset controller (SRC) to i.MX51 and i.MX53 device tree Philipp Zabel
2013-02-19 11:35 ` [PATCH v3 8/8] reset: Add driver for gpio-controlled reset pins Philipp Zabel
2013-02-19 21:57 ` Stephen Warren
2013-02-20 11:22 ` Philipp Zabel
2013-02-20 17:14 ` Stephen Warren
2013-02-19 21:23 ` Stephen Warren [this message]
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