linux-kernel - Re: [PATCH v3] spi: dts: sun4i: Add support for hardware-based wait time between words

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Message-ID: <CAGNoLaMR48FP6LA6OCUiwBFpja_inx47f-7hzLC3+=6td6oeaQ@mail.gmail.com>
Date:	Mon, 14 Dec 2015 09:08:09 +0100
From:	Marcus Weseloh <mweseloh42@...il.com>
To:	Rob Herring <robh@...nel.org>
Cc:	linux-sunxi <linux-sunxi@...glegroups.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Mark Brown <broonie@...nel.org>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Chen-Yu Tsai <wens@...e.org>,
	devicetree <devicetree@...r.kernel.org>,
	linux-kernel@...r.kernel.org, linux-spi@...r.kernel.org,
	"Mailing List, Arm" <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3] spi: dts: sun4i: Add support for hardware-based wait
 time between words

2015-12-14 8:31 GMT+01:00 Marcus Weseloh <mweseloh42@...il.com>:
> [...]
>>> +     /* Setup wait time between words */
>>> +     of_property_read_u32(spi->dev.of_node, "spi-word-wait-ns",
>>> +                          &wait_ns);
>>
>> Read this in probe and save the value rather than fetching every
>> transfer.
>
> But this is a slave property I'm using here. If I read and store it in
> probe in the spi-sun4i driver, I won't have access to the slave node
> property, will I?

Sorry, I think I get it now. I would need to read the value in SPI
core, when the slave device gets probed. I will send an updated patch.

Thanks,

    Marcus
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