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39 lines
1.2 KiB
Diff
39 lines
1.2 KiB
Diff
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From c3fbb1e6771dabb14571552c036a049ffa470eb1 Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.com>
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Date: Fri, 30 Apr 2021 08:34:36 +0100
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Subject: [PATCH] spi: bcm2835: Increase the CS limit to 24
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Increase the maximum number of CS lines to 24, and ensure this limit is
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not exceeded.
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See: https://github.com/raspberrypi/linux/pull/4281
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Suggested-by: Joe Burmeister <joe.burmeister@devtank.co.uk>
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Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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---
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drivers/spi/spi-bcm2835.c | 6 ++++++
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1 file changed, 6 insertions(+)
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--- a/drivers/spi/spi-bcm2835.c
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+++ b/drivers/spi/spi-bcm2835.c
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@@ -28,6 +28,7 @@
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#include <linux/gpio/consumer.h>
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#include <linux/gpio/machine.h> /* FIXME: using chip internals */
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#include <linux/gpio/driver.h> /* FIXME: using chip internals */
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+#include <linux/of_gpio.h>
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#include <linux/of_irq.h>
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#include <linux/spi/spi.h>
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@@ -1299,6 +1300,11 @@ static int bcm2835_spi_probe(struct plat
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struct bcm2835_spi *bs;
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int err;
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+ if (of_gpio_named_count(pdev->dev.of_node, "cs-gpios") >
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+ BCM2835_SPI_NUM_CS)
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+ return dev_err_probe(&pdev->dev, -EINVAL,
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+ "too many chip selects\n");
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+
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ctlr = devm_spi_alloc_master(&pdev->dev, ALIGN(sizeof(*bs),
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dma_get_cache_alignment()));
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if (!ctlr)
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