From: "Piotr Król" <piotr.krol@3mdeb.com>
To: linux-serial@vger.kernel.org
Cc: jslaby@suse.cz, gregkh@linuxfoundation.org, linux@arm.linux.org.uk
Subject: amba-pl011 complains about DMA for bcm2835 where it is not supported
Date: Tue, 28 Oct 2014 00:44:31 +0100 [thread overview]
Message-ID: <20141027234430.GA1788@haysend> (raw)
Hi all,
according to BCM2835 ARM Peripherals spec DMA is optional functionality
for ARM PL011 UART and it is not supported on this SoC. It looks like
amba-pl011 search for device tree property (dma-names) unconditionally,
what leads to error message:
of_dma_request_slave_channel: dma-names property of node '/soc/uart@7e201000' missing or empty
uart-pl011 20201000.uart: no DMA platform data
I assume that if it is possible that amba-pl011 can be without DMA we
should check if DMA is supported and then try to read properties. Is
there any known method for checking dma support ? If yes that I would be
glad for any pointers.
Let me know if I should ignore/accept this error message or there is
some code fix needed.
Thanks,
Piotr Król
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next reply other threads:[~2014-10-28 0:03 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-27 23:44 Piotr Król [this message]
2014-10-27 23:59 ` amba-pl011 complains about DMA for bcm2835 where it is not supported Russell King - ARM Linux
2014-10-28 0:09 ` Piotr Król
2014-10-28 0:16 ` Russell King - ARM Linux
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