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authorTony Lindgren <tony@atomide.com>2018-02-22 14:05:14 -0800
committerTony Lindgren <tony@atomide.com>2018-02-26 14:16:10 -0800
commit3bb37c8e6e6a6191233c97f294cecba10bb5fc50 (patch)
tree27b3f19b802a077b256102c8a9a0a567602b194f /drivers/bus
parent62020f231232215df73ca54669e38fe3f1d1b29a (diff)
downloadlinux-3bb37c8e6e6a6191233c97f294cecba10bb5fc50.tar.bz2
bus: ti-sysc: Handle stdout-path for debug console
If we have stdout-path specified for earlycon, we must prevent the debug console from idling until runtime PM kicks in. Signed-off-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'drivers/bus')
-rw-r--r--drivers/bus/ti-sysc.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c
index 2bb0d0061624..7d82d5add7c1 100644
--- a/drivers/bus/ti-sysc.c
+++ b/drivers/bus/ti-sysc.c
@@ -206,6 +206,50 @@ static int sysc_parse_and_check_child_range(struct sysc *ddata)
return 0;
}
+static struct device_node *stdout_path;
+
+static void sysc_init_stdout_path(struct sysc *ddata)
+{
+ struct device_node *np = NULL;
+ const char *uart;
+
+ if (IS_ERR(stdout_path))
+ return;
+
+ if (stdout_path)
+ return;
+
+ np = of_find_node_by_path("/chosen");
+ if (!np)
+ goto err;
+
+ uart = of_get_property(np, "stdout-path", NULL);
+ if (!uart)
+ goto err;
+
+ np = of_find_node_by_path(uart);
+ if (!np)
+ goto err;
+
+ stdout_path = np;
+
+ return;
+
+err:
+ stdout_path = ERR_PTR(-ENODEV);
+}
+
+static void sysc_check_quirk_stdout(struct sysc *ddata,
+ struct device_node *np)
+{
+ sysc_init_stdout_path(ddata);
+ if (np != stdout_path)
+ return;
+
+ ddata->cfg.quirks |= SYSC_QUIRK_NO_IDLE_ON_INIT |
+ SYSC_QUIRK_NO_RESET_ON_INIT;
+}
+
/**
* sysc_check_one_child - check child configuration
* @ddata: device driver data
@@ -224,6 +268,8 @@ static int sysc_check_one_child(struct sysc *ddata,
if (name)
dev_warn(ddata->dev, "really a child ti,hwmods property?");
+ sysc_check_quirk_stdout(ddata, np);
+
return 0;
}