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43 lines
1.4 KiB
Diff
43 lines
1.4 KiB
Diff
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From 5d9075ed7e73dc6ccebf78710c78f39ddc2dd78e Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.com>
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Date: Mon, 8 Jan 2024 11:42:57 +0000
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Subject: [PATCH] spi: bcm2835: Support spi0-0cs and SPI_NO_CS mode
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The forced conversion of native CS lines into software CS lines is done
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whether or not the controller has been given any CS lines to use. This
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breaks the use of the spi0-0cs overlay to prevent SPI from claiming any
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CS lines, particularly with spidev which doesn't pass in the SPI_NO_CS
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flag at creation.
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Use the presence of an empty cs-gpios property as an indication that no
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CS lines should be used, bypassing the native CS conversion code.
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See: https://github.com/raspberrypi/linux/issues/5835
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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 | 5 +++++
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1 file changed, 5 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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@@ -1222,6 +1222,7 @@ static int bcm2835_spi_setup(struct spi_
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struct bcm2835_spi *bs = spi_controller_get_devdata(ctlr);
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struct bcm2835_spidev *slv = spi_get_ctldata(spi);
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struct gpio_chip *chip;
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+ int len;
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int ret;
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u32 cs;
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@@ -1287,6 +1288,10 @@ static int bcm2835_spi_setup(struct spi_
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goto err_cleanup;
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}
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+ /* Skip forced CS conversion if controller has an empty cs-gpios property */
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+ if (of_find_property(ctlr->dev.of_node, "cs-gpios", &len) && len == 0)
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+ return 0;
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+
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/*
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* Translate native CS to GPIO
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*
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