mirror of
https://github.com/Ysurac/openmptcprouter.git
synced 2025-03-09 15:40:20 +00:00
42 lines
1.5 KiB
Diff
42 lines
1.5 KiB
Diff
From 69e6058ae026e6d73796b698e5a95e32d9b5a742 Mon Sep 17 00:00:00 2001
|
|
From: Phil Elwell <phil@raspberrypi.com>
|
|
Date: Mon, 8 Jan 2024 11:42:57 +0000
|
|
Subject: [PATCH 413/697] 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
|
|
@@ -1225,6 +1225,7 @@ 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 gpiod_lookup_table *lookup __free(kfree) = NULL;
|
|
+ int len;
|
|
int ret;
|
|
u32 cs;
|
|
|
|
@@ -1290,6 +1291,10 @@ 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;
|
|
+
|
|
/*
|
|
* TODO: The code below is a slightly better alternative to the utter
|
|
* abuse of the GPIO API that I found here before. It creates a
|