path: root/configs/platform-v7a/patches/barebox-2021.02.0/of-base-probe-simple-pm-bus-children-as-well.patch
blob: 787366640b997c9be419abb58c25af16a3e0700e (plain) (tree)

From: Ahmad Fatoum <>
Date: Fri, 12 Mar 2021 08:27:46 +0100
Subject: [PATCH] of: base: probe simple-pm-bus children as well

Upstream is migrating device trees like those of the am33xx to use
simple-pm-bus, where applicable. These are buses that reference a clock
or a power domain that needs to be enabled in order to use devices on it.

As we didn't yet support this binding, this broke the Beaglebone
and all other am33xx board since v2021.02.0.

Fix this by adding simple-pm-bus to the of_default_bus_match_table.
Note that this is only an adequate solution for when the power domain
and clocks referenced are already enabled prior to barebox startup.

For all other cases, driver support must be available for the clock
and power domains in questions and this driver must be extended to
make use of them. For the am33xx, the relevant buses are powered
and clocked on boot up, so we leave general support to another day..

Fixes: 6ea3de1b8ce7 ("dts: update to v5.11-rc1")
Signed-off-by: Ahmad Fatoum <>
 drivers/of/base.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 8759099d7480..6fe02649ee53 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -2272,6 +2272,8 @@ const char *of_get_model(void)
 const struct of_device_id of_default_bus_match_table[] = {
 		.compatible = "simple-bus",
+	}, {
+		.compatible = "simple-pm-bus",
 	}, {
 		.compatible = "simple-mfd",
 	}, {