From: Martin Kaiser <martin@kaiser.cx>
To: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
Cc: Mark Brown <broonie@kernel.org>, Shawn Guo <shawnguo@kernel.org>,
Sascha Hauer <s.hauer@pengutronix.de>,
Pengutronix Kernel Team <kernel@pengutronix.de>,
Fabio Estevam <festevam@gmail.com>,
Alexander Stein <alexander.stein@ew.tq-group.com>,
Francesco Dolcini <francesco.dolcini@toradex.com>,
linux-spi@vger.kernel.org, imx@lists.linux.dev,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] spi: imx: Don't expect DMA for i.MX{25,35,50,51,53} cspi devices
Date: Wed, 8 May 2024 15:44:53 +0200 [thread overview]
Message-ID: <ZjuB1Rjyu1ooYvDi@akranes.kaiser.cx> (raw)
In-Reply-To: <20240508095610.2146640-2-u.kleine-koenig@pengutronix.de>
Hi Uwe,
Thus wrote Uwe Kleine-König (u.kleine-koenig@pengutronix.de):
> While in commit 2dd33f9cec90 ("spi: imx: support DMA for imx35") it was
> claimed that DMA works on i.MX25, i.MX31 and i.MX35 the respective
> device trees don't add DMA channels. The Reference manuals of i.MX31 and
> i.MX25 also don't mention the CSPI core being DMA capable. (I didn't
> check the others.)
If I'm not mistaken, the imx25 reference manual
https://www.nxp.com/docs/en/reference-manual/IMX25RM.pdf
does say that CSPI has DMA support. Section 18.1.1 (Features) lists DMA as one
of the features. There's also DMA events (section 3) for CSPI-1/2/3 RX, TX.
I'd have to dig up the hardware to test again if this is actually working...
Martin
next prev parent reply other threads:[~2024-05-08 14:01 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-08 9:56 [PATCH] spi: imx: Don't expect DMA for i.MX{25,35,50,51,53} cspi devices Uwe Kleine-König
2024-05-08 13:44 ` Martin Kaiser [this message]
2024-05-10 12:32 ` [PATCH] spi: imx: Don't expect DMA for i.MX{25, 35, 50, 51, 53} " Uwe Kleine-König
2024-05-10 13:40 ` Uwe Kleine-König
2024-05-12 16:14 ` Martin Kaiser
2024-05-15 19:26 ` Martin Kaiser
2024-06-12 16:52 ` Marc Kleine-Budde
2024-06-13 16:11 ` Martin Kaiser
2024-06-23 12:07 ` [PATCH] spi: imx: Don't expect DMA for i.MX{25,35,50,51,53} " Mark Brown
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=ZjuB1Rjyu1ooYvDi@akranes.kaiser.cx \
--to=martin@kaiser.cx \
--cc=alexander.stein@ew.tq-group.com \
--cc=broonie@kernel.org \
--cc=festevam@gmail.com \
--cc=francesco.dolcini@toradex.com \
--cc=imx@lists.linux.dev \
--cc=kernel@pengutronix.de \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-spi@vger.kernel.org \
--cc=s.hauer@pengutronix.de \
--cc=shawnguo@kernel.org \
--cc=u.kleine-koenig@pengutronix.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox