27c9d80f51
Some checks failed
Build Kernel / Build all affected Kernels (push) Has been cancelled
Build all core packages / Build all core packages for selected target (push) Has been cancelled
Build and Push prebuilt tools container / Build and Push all prebuilt containers (push) Has been cancelled
Build Toolchains / Build Toolchains for each target (push) Has been cancelled
Build host tools / Build host tools for linux and macos based systems (push) Has been cancelled
Coverity scan build / Coverity x86/64 build (push) Has been cancelled
43 lines
1.4 KiB
Diff
43 lines
1.4 KiB
Diff
From a70302cd341cb331bbed1b5fa3d1ec5af1105676 Mon Sep 17 00:00:00 2001
|
|
From: Phil Elwell <phil@raspberrypi.com>
|
|
Date: Mon, 8 Jan 2024 11:42:57 +0000
|
|
Subject: [PATCH 0821/1085] spi: bcm2835: Support spi0-0cs and SPI_NO_CS mode
|
|
|
|
The forced conversion of native CS lines into software CS lines is done
|
|
whether or not the controller has been given any CS lines to use. This
|
|
breaks the use of the spi0-0cs overlay to prevent SPI from claiming any
|
|
CS lines, particularly with spidev which doesn't pass in the SPI_NO_CS
|
|
flag at creation.
|
|
|
|
Use the presence of an empty cs-gpios property as an indication that no
|
|
CS lines should be used, bypassing the native CS conversion code.
|
|
|
|
See: https://github.com/raspberrypi/linux/issues/5835
|
|
|
|
Signed-off-by: Phil Elwell <phil@raspberrypi.com>
|
|
---
|
|
drivers/spi/spi-bcm2835.c | 5 +++++
|
|
1 file changed, 5 insertions(+)
|
|
|
|
--- a/drivers/spi/spi-bcm2835.c
|
|
+++ b/drivers/spi/spi-bcm2835.c
|
|
@@ -1222,6 +1222,7 @@ static int bcm2835_spi_setup(struct spi_
|
|
struct bcm2835_spi *bs = spi_controller_get_devdata(ctlr);
|
|
struct bcm2835_spidev *target = spi_get_ctldata(spi);
|
|
struct gpio_chip *chip;
|
|
+ int len;
|
|
int ret;
|
|
u32 cs;
|
|
|
|
@@ -1287,6 +1288,10 @@ static int bcm2835_spi_setup(struct spi_
|
|
goto err_cleanup;
|
|
}
|
|
|
|
+ /* Skip forced CS conversion if controller has an empty cs-gpios property */
|
|
+ if (of_find_property(ctlr->dev.of_node, "cs-gpios", &len) && len == 0)
|
|
+ return 0;
|
|
+
|
|
/*
|
|
* Translate native CS to GPIO
|
|
*
|