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author | Tony Lindgren <tony@atomide.com> | 2018-02-22 14:05:14 -0800 |
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committer | Tony Lindgren <tony@atomide.com> | 2018-02-26 14:16:10 -0800 |
commit | 3bb37c8e6e6a6191233c97f294cecba10bb5fc50 (patch) | |
tree | 27b3f19b802a077b256102c8a9a0a567602b194f | |
parent | 62020f231232215df73ca54669e38fe3f1d1b29a (diff) | |
download | op-kernel-dev-3bb37c8e6e6a6191233c97f294cecba10bb5fc50.zip op-kernel-dev-3bb37c8e6e6a6191233c97f294cecba10bb5fc50.tar.gz |
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>
-rw-r--r-- | drivers/bus/ti-sysc.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c index 2bb0d00..7d82d5a 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; } |