Initial commit

patches/uboot/0002-drivers-bcm283x-allow-to-spawn-any-PL011-UART.patch

@@ -0,0 +1,68 @@
+From 921f4b6d8cb3b997dd5c54fd436bb8223046421e Mon Sep 17 00:00:00 2001
+Message-Id: <921f4b6d8cb3b997dd5c54fd436bb8223046421e.1668448114.git.stefan@agner.ch>
+In-Reply-To: <85fb54b621c1ca79f1ec8634b0597a038338e51d.1668448114.git.stefan@agner.ch>
+References: <85fb54b621c1ca79f1ec8634b0597a038338e51d.1668448114.git.stefan@agner.ch>
+From: Stefan Agner <stefan@agner.ch>
+Date: Thu, 14 Apr 2022 12:18:41 +0200
+Subject: [PATCH] drivers: bcm283x: allow to spawn any PL011 UART
+
+The current code checks pinmux for the first PL011 only. Raspberry Pi 4
+has multiple PL011 UARTs. This code prevents probing of other UARTs in
+case the first PL011 UART is not active.
+
+Furthermore, U-Boot supports pinmuxing, hence the pins should be muxed
+at this point anyway. Drop the check entirly.
+
+This allows to use other UARTs as stdout paths (e.g. stdout-path =
+"serial5:115200n8").
+
+Signed-off-by: Stefan Agner <stefan@agner.ch>
+---
+ drivers/serial/serial_bcm283x_pl011.c | 27 ---------------------------
+ 1 file changed, 27 deletions(-)
+
+diff --git a/drivers/serial/serial_bcm283x_pl011.c b/drivers/serial/serial_bcm283x_pl011.c
+index fcba07f1c5..98628e1ca4 100644
+--- a/drivers/serial/serial_bcm283x_pl011.c
++++ b/drivers/serial/serial_bcm283x_pl011.c
+@@ -11,37 +11,10 @@
+ #include <serial.h>
+ #include "serial_pl01x_internal.h"
+ 
+-/*
+- * Check if this serial device is muxed
+- *
+- * The serial device will only work properly if it has been muxed to the serial
+- * pins by firmware. Check whether that happened here.
+- *
+- * Return: true if serial device is muxed, false if not
+- */
+-static bool bcm283x_is_serial_muxed(void)
+-{
+-	int serial_gpio = 15;
+-	struct udevice *dev;
+-
+-	if (uclass_first_device_err(UCLASS_PINCTRL, &dev))
+-		return false;
+-
+-	if (pinctrl_get_gpio_mux(dev, 0, serial_gpio) != BCM2835_GPIO_ALT0)
+-		return false;
+-
+-	return true;
+-}
+-
+ static int bcm283x_pl011_serial_probe(struct udevice *dev)
+ {
+-	struct pl01x_serial_plat *plat = dev_get_plat(dev);
+ 	int ret;
+ 
+-	/* Don't spawn the device if it's not muxed */
+-	if (!bcm283x_is_serial_muxed())
+-		return -ENODEV;
+-
+ 	/*
+ 	 * Read the ofdata here rather than in an of_to_plat() method
+ 	 * since we need the soc simple-bus to be probed so that the 'ranges'
+-- 
+2.38.1
+