bcm27xx: add linux 5.4 support

Tested on bcm2710 (Raspberry Pi 3B).

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 35 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.4/950-0220-spi-bcm2835-enable-shared-interrupt-support.patch b/target/linux/bcm27xx/patches-5.4/950-0220-spi-bcm2835-enable-shared-interrupt-support.patch
new file mode 100644
index 0000000000..5e2a367750
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0220-spi-bcm2835-enable-shared-interrupt-support.patch
@@ -0,0 +1,35 @@
+From ac94635b678715af00a685ada0a1b60dfb54c771 Mon Sep 17 00:00:00 2001
+From: Martin Sperl <kernel@martin.sperl.org>
+Date: Mon, 13 May 2019 11:05:27 +0000
+Subject: [PATCH] spi: bcm2835: enable shared interrupt support
+
+Add shared interrupt support for this driver.
+
+Signed-off-by: Martin Sperl <kernel@martin.sperl.org>
+---
+ drivers/spi/spi-bcm2835.c | 7 ++++++-
+ 1 file changed, 6 insertions(+), 1 deletion(-)
+
+--- a/drivers/spi/spi-bcm2835.c
++++ b/drivers/spi/spi-bcm2835.c
+@@ -379,6 +379,10 @@ static irqreturn_t bcm2835_spi_interrupt
+ 	if (bs->tx_len && cs & BCM2835_SPI_CS_DONE)
+ 		bcm2835_wr_fifo_blind(bs, BCM2835_SPI_FIFO_SIZE);
+ 
++	/* check if we got interrupt enabled */
++	if (!(bcm2835_rd(bs, BCM2835_SPI_CS) & BCM2835_SPI_CS_INTR))
++		return IRQ_NONE;
++
+ 	/* Read as many bytes as possible from FIFO */
+ 	bcm2835_rd_fifo(bs);
+ 	/* Write as many bytes as possible to FIFO */
+@@ -1335,7 +1339,8 @@ static int bcm2835_spi_probe(struct plat
+ 	bcm2835_wr(bs, BCM2835_SPI_CS,
+ 		   BCM2835_SPI_CS_CLEAR_RX | BCM2835_SPI_CS_CLEAR_TX);
+ 
+-	err = devm_request_irq(&pdev->dev, bs->irq, bcm2835_spi_interrupt, 0,
++	err = devm_request_irq(&pdev->dev, bs->irq, bcm2835_spi_interrupt,
++			       IRQF_SHARED,
+ 			       dev_name(&pdev->dev), ctlr);
+ 	if (err) {
+ 		dev_err(&pdev->dev, "could not request IRQ: %d\n", err);