linux-kernel - [PATCH/RFC 6/6] spi: spidev: Allow direct references in DT from SPI slave controllers

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Date:	Wed, 22 Jun 2016 15:42:09 +0200
From:	Geert Uytterhoeven <geert+renesas@...der.be>
To:	Mark Brown <broonie@...nel.org>
Cc:	Rob Herring <robh+dt@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Magnus Damm <magnus.damm@...il.com>,
	Hisashi Nakamura <hisashi.nakamura.ak@...esas.com>,
	Hiromitsu Yamasaki <hiromitsu.yamasaki.ym@...esas.com>,
	linux-spi@...r.kernel.org, devicetree@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH/RFC 6/6] spi: spidev: Allow direct references in DT from SPI slave controllers

SPI slave protocols are typically handled in userspace through spidev,
hence suppress the warning when the SPI controller is running in slave
mode.

Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
 drivers/spi/spidev.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spidev.c b/drivers/spi/spidev.c
index e3c19f30f591115a..8b590dd96480a9f9 100644
--- a/drivers/spi/spidev.c
+++ b/drivers/spi/spidev.c
@@ -713,7 +713,8 @@ static int spidev_probe(struct spi_device *spi)
 	 * compatible string, it is a Linux implementation thing
 	 * rather than a description of the hardware.
 	 */
-	if (spi->dev.of_node && !of_match_device(spidev_dt_ids, &spi->dev)) {
+	if (spi->dev.of_node && !of_match_device(spidev_dt_ids, &spi->dev) &&
+	    !(spi->master->flags & SPI_MASTER_IS_SLAVE)) {
 		dev_err(&spi->dev, "buggy DT: spidev listed directly in DT\n");
 		WARN_ON(spi->dev.of_node &&
 			!of_match_device(spidev_dt_ids, &spi->dev));
-- 
1.9.1