bcm27xx: import latest patches from the RPi foundation

bcm2708: boot tested on RPi B+ v1.2
bcm2709: boot tested on RPi 3B v1.2 and RPi 4B v1.1 4G
bcm2710: boot tested on RPi 3B v1.2
bcm2711: boot tested on RPi 4B v1.1 4G

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 60 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.4/950-0510-clk-bcm-rpi-Allow-the-driver-to-be-probed-by-DT.patch b/target/linux/bcm27xx/patches-5.4/950-0510-clk-bcm-rpi-Allow-the-driver-to-be-probed-by-DT.patch
new file mode 100644
index 0000000000..d622d9ded5
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0510-clk-bcm-rpi-Allow-the-driver-to-be-probed-by-DT.patch
@@ -0,0 +1,60 @@
+From faeea753ba262e2a781570f9db23c5773c5d20e7 Mon Sep 17 00:00:00 2001
+From: Maxime Ripard <maxime@cerno.tech>
+Date: Mon, 23 Dec 2019 19:58:08 +0100
+Subject: [PATCH] clk: bcm: rpi: Allow the driver to be probed by DT
+
+The current firmware clock driver for the RaspberryPi can only be probed by
+manually registering an associated platform_device.
+
+While this works fine for cpufreq where the device gets attached a clkdev
+lookup, it would be tedious to maintain a table of all the devices using
+one of the clocks exposed by the firmware.
+
+Since the DT on the other hand is the perfect place to store those
+associations, make the firmware clocks driver probe-able through the device
+tree so that we can represent it as a node.
+
+Cc: Michael Turquette <mturquette@baylibre.com>
+Cc: Stephen Boyd <sboyd@kernel.org>
+Cc: linux-clk@vger.kernel.org
+Signed-off-by: Maxime Ripard <maxime@cerno.tech>
+---
+ drivers/clk/bcm/clk-raspberrypi.c | 11 ++++++++---
+ 1 file changed, 8 insertions(+), 3 deletions(-)
+
+--- a/drivers/clk/bcm/clk-raspberrypi.c
++++ b/drivers/clk/bcm/clk-raspberrypi.c
+@@ -255,15 +255,13 @@ static int raspberrypi_clk_probe(struct
+ 	struct raspberrypi_clk *rpi;
+ 	int ret;
+ 
+-	firmware_node = of_find_compatible_node(NULL, NULL,
+-					"raspberrypi,bcm2835-firmware");
++	firmware_node = of_parse_phandle(dev->of_node, "raspberrypi,firmware", 0);
+ 	if (!firmware_node) {
+ 		dev_err(dev, "Missing firmware node\n");
+ 		return -ENOENT;
+ 	}
+ 
+ 	firmware = rpi_firmware_get(firmware_node);
+-	of_node_put(firmware_node);
+ 	if (!firmware)
+ 		return -EPROBE_DEFER;
+ 
+@@ -300,9 +298,16 @@ static int raspberrypi_clk_remove(struct
+ 	return 0;
+ }
+ 
++static const struct of_device_id raspberrypi_clk_match[] = {
++        { .compatible = "raspberrypi,firmware-clocks" },
++        { },
++};
++MODULE_DEVICE_TABLE(of, raspberrypi_clk_match);
++
+ static struct platform_driver raspberrypi_clk_driver = {
+ 	.driver = {
+ 		.name = "raspberrypi-clk",
++		.of_match_table = raspberrypi_clk_match,
+ 	},
+ 	.probe          = raspberrypi_clk_probe,
+ 	.remove		= raspberrypi_clk_remove,