6.1-stable review patch. If anyone has any objections, please let me know.
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From: Icenowy Zheng uwu@icenowy.me
[ Upstream commit 725f31f300e300a9d94976bd8f1db6e746f95f63 ]
Although the current device tree binding of thermal zones require the trips subnode, the binding in kernel v5.15 does not require it, and many device trees shipped with the kernel, for example, allwinner/sun50i-a64.dtsi and mediatek/mt8183-kukui.dtsi in ARM64, still comply to the old binding and contain no trips subnode.
Allow the code to successfully register thermal zones w/o trips subnode for DT binding compatibility now.
Furtherly, the inconsistency between DTs and bindings should be resolved by either adding empty trips subnode or dropping the trips subnode requirement.
Fixes: d0c75fa2c17f ("thermal/of: Initialize trip points separately") Signed-off-by: Icenowy Zheng uwu@icenowy.me [wenst@chromium.org: Reworked logic and kernel log messages] Signed-off-by: Chen-Yu Tsai wenst@chromium.org Reviewed-by: Rafael J. Wysocki rafael@kernel.org Link: https://lore.kernel.org/r/20241018073139.1268995-1-wenst@chromium.org Signed-off-by: Daniel Lezcano daniel.lezcano@linaro.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/thermal/thermal_of.c | 21 ++++++++++----------- 1 file changed, 10 insertions(+), 11 deletions(-)
diff --git a/drivers/thermal/thermal_of.c b/drivers/thermal/thermal_of.c index 323c8cd171485..07476147559a5 100644 --- a/drivers/thermal/thermal_of.c +++ b/drivers/thermal/thermal_of.c @@ -238,18 +238,15 @@ static struct thermal_trip *thermal_of_trips_init(struct device_node *np, int *n struct device_node *trips; int ret, count;
+ *ntrips = 0; + trips = of_get_child_by_name(np, "trips"); - if (!trips) { - pr_err("Failed to find 'trips' node\n"); - return ERR_PTR(-EINVAL); - } + if (!trips) + return NULL;
count = of_get_child_count(trips); - if (!count) { - pr_err("No trip point defined\n"); - ret = -EINVAL; - goto out_of_node_put; - } + if (!count) + return NULL;
tt = kzalloc(sizeof(*tt) * count, GFP_KERNEL); if (!tt) { @@ -272,7 +269,6 @@ static struct thermal_trip *thermal_of_trips_init(struct device_node *np, int *n
out_kfree: kfree(tt); - *ntrips = 0; out_of_node_put: of_node_put(trips);
@@ -619,11 +615,14 @@ struct thermal_zone_device *thermal_of_zone_register(struct device_node *sensor,
trips = thermal_of_trips_init(np, &ntrips); if (IS_ERR(trips)) { - pr_err("Failed to find trip points for %pOFn id=%d\n", sensor, id); + pr_err("Failed to parse trip points for %pOFn id=%d\n", sensor, id); ret = PTR_ERR(trips); goto out_kfree_of_ops; }
+ if (!trips) + pr_info("No trip points found for %pOFn id=%d\n", sensor, id); + ret = thermal_of_monitor_init(np, &delay, &pdelay); if (ret) { pr_err("Failed to initialize monitoring delays from %pOFn\n", np);