linux-kernel - [PATCH 2/2] spi: add support for generic linux,use-rt-queue flag

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Date:   Fri,  2 Jun 2023 13:52:01 +0200
From:   Matthias Schiffer <matthias.schiffer@...tq-group.com>
To:     Mark Brown <broonie@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>
Cc:     linux-spi@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux@...tq-group.com,
        Matthias Schiffer <matthias.schiffer@...tq-group.com>
Subject: [PATCH 2/2] spi: add support for generic linux,use-rt-queue flag

Instead of requiring per-driver support to handle the message queue with
realtime priority, add handling for a linux,use-rt-queue DT flag to the
generic SPI controller initialization.

Signed-off-by: Matthias Schiffer <matthias.schiffer@...tq-group.com>
---
 drivers/spi/spi.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 9291b2a0e8871..f069f1aef5378 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -3185,6 +3185,11 @@ int spi_register_controller(struct spi_controller *ctlr)
 		ctlr->mode_bits |= SPI_CS_HIGH;
 	}
 
+	/* Run message pump with realtime priority */
+	if (ctlr->dev.of_node &&
+	    of_property_read_bool(ctlr->dev.of_node, "linux,use-rt-queue"))
+		ctlr->rt = true;
+
 	/*
 	 * Even if it's just one always-selected device, there must
 	 * be at least one chipselect.
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