linux-kernel - [PATCH 3.19 64/75] spi: qup: Fix cs-num DT property parsing

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Date:	Fri, 10 Apr 2015 15:19:30 +0200
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, "Ivan T. Ivanov" <iivanov@...sol.com>,
	Mark Brown <broonie@...nel.org>
Subject: [PATCH 3.19 64/75] spi: qup: Fix cs-num DT property parsing

3.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: "Ivan T. Ivanov" <iivanov@...sol.com>

commit 12cb89e37a0c25fae7a0f1d2e4985558db9d0b13 upstream.

num-cs is 32 bit property, don't read just upper 16 bits.

Fixes: 4a8573abe965 (spi: qup: Remove chip select function)
Signed-off-by: Ivan T. Ivanov <iivanov@...sol.com>
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/spi/spi-qup.c |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

--- a/drivers/spi/spi-qup.c
+++ b/drivers/spi/spi-qup.c
@@ -489,7 +489,7 @@ static int spi_qup_probe(struct platform
 	struct resource *res;
 	struct device *dev;
 	void __iomem *base;
-	u32 max_freq, iomode;
+	u32 max_freq, iomode, num_cs;
 	int ret, irq, size;
 
 	dev = &pdev->dev;
@@ -541,10 +541,11 @@ static int spi_qup_probe(struct platform
 	}
 
 	/* use num-cs unless not present or out of range */
-	if (of_property_read_u16(dev->of_node, "num-cs",
-			&master->num_chipselect) ||
-			(master->num_chipselect > SPI_NUM_CHIPSELECTS))
+	if (of_property_read_u32(dev->of_node, "num-cs", &num_cs) ||
+	    num_cs > SPI_NUM_CHIPSELECTS)
 		master->num_chipselect = SPI_NUM_CHIPSELECTS;
+	else
+		master->num_chipselect = num_cs;
 
 	master->bus_num = pdev->id;
 	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LOOP;


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