From: Chen-Yu Tsai <wens@csie.org>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jiri Slaby <jslaby@suse.cz>, Pawel Moll <pawel.moll@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Ian Campbell <ijc+devicetree@hellion.org.uk>,
Kumar Gala <galak@codeaurora.org>,
Rob Herring <robh+dt@kernel.org>
Cc: Chen-Yu Tsai <wens@csie.org>,
Maxime Ripard <maxime.ripard@free-electrons.com>,
devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v5 0/2] serial: 8250_dw: optional reset control and deferred probe support
Date: Wed, 23 Jul 2014 23:33:05 +0800 [thread overview]
Message-ID: <1406129587-24668-1-git-send-email-wens@csie.org> (raw)
Hi Greg,
This series adds optional reset control and deferred probing support
to 8250_dw. These are required to support the UARTs on sun6i/sun8i.
They were originally part of my sun8i PRCM series. The other parts
of that series have been merged already. It would be really nice
if we could get these 2 in as well.
Patch 1 adds optional reset control support to the 8250_dw, which
is used by sun6i and sun8i platforms. Till now, this wasn't needed
from a working standpoint, as the bootloader de-asserts the reset
control on the console UART for us. However, during the development
of the sun8i patches, I noticed other UARTs wouldn't work. Also the
new sun6i A31 Hummingbird has multiple UARTs available, which would
require this patch.
Patch 2 adds deferred probing to 8250_dw. In my case, even though
the clocks and reset controller "devices" were registered before
the UART, the 8250_dw driver binded with the UART devices before
the clocks and resets were available. This resulted in the 8250_dw
driver failing. I only tested the R_UART device.
Patch 2 also does proper cleanup in the event that probing failed.
Maxime, I dropped your Acked-by because I added the cleanup code
path.
Changes since v4:
- Rebased onto tty-next (4847914)
- Do proper cleanup in the probe function if errors are encountered.
No changes before v4.
Cheers
ChenYu
Chen-Yu Tsai (2):
serial: 8250_dw: Add optional reset control support
serial: 8250_dw: Add support for deferred probing
.../bindings/serial/snps-dw-apb-uart.txt | 1 +
drivers/tty/serial/8250/8250_dw.c | 50 +++++++++++++++++++---
2 files changed, 44 insertions(+), 7 deletions(-)
--
2.0.1
next reply other threads:[~2014-07-23 15:33 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-23 15:33 Chen-Yu Tsai [this message]
2014-07-23 15:33 ` [PATCH v5 1/2] serial: 8250_dw: Add optional reset control support Chen-Yu Tsai
2014-07-23 15:33 ` [PATCH v5 2/2] serial: 8250_dw: Add support for deferred probing Chen-Yu Tsai
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