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authorChen-Yu Tsai <wens@csie.org>2018-12-17 12:04:35 +0800
committerMarcel Holtmann <marcel@holtmann.org>2018-12-19 00:28:38 +0100
commit6ae81eebdef97109c32e545e90865bc5b14178f1 (patch)
tree0ca2c96c2ad1de7a967471560ab9899f021efdc4 /Documentation
parentBluetooth: Change to use DEFINE_SHOW_ATTRIBUTE macro (diff)
downloadlinux-dev-6ae81eebdef97109c32e545e90865bc5b14178f1.tar.xz
linux-dev-6ae81eebdef97109c32e545e90865bc5b14178f1.zip
dt-bindings: net: broadcom-bluetooth: Fix external clock names
The Broadcom Bluetooth controllers can take up to two external clocks: an external frequency reference, substituting the main crystal, and a LPO clock at 32.768 kHz substituting the internal LPO clock. In particular, the external LPO clock must be used when the controller does not have NVRAM connected, and the main reference frequency is not the default 20 MHz. This is described in detail in the datasheet. The original "extclk" clock name is ambiguous as to which of these it refers to, and some designs might even require both. This patch deprecates the existing name, and adds "txco" and "lpo". Tested-by: Ondrej Jirman <megous@megous.com> Signed-off-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/devicetree/bindings/net/broadcom-bluetooth.txt7
1 files changed, 5 insertions, 2 deletions
diff --git a/Documentation/devicetree/bindings/net/broadcom-bluetooth.txt b/Documentation/devicetree/bindings/net/broadcom-bluetooth.txt
index 4194ff7e6ee6..711c75ac2bb5 100644
--- a/Documentation/devicetree/bindings/net/broadcom-bluetooth.txt
+++ b/Documentation/devicetree/bindings/net/broadcom-bluetooth.txt
@@ -18,8 +18,11 @@ Optional properties:
- shutdown-gpios: GPIO specifier, used to enable the BT module
- device-wakeup-gpios: GPIO specifier, used to wakeup the controller
- host-wakeup-gpios: GPIO specifier, used to wakeup the host processor
- - clocks: clock specifier if external clock provided to the controller
- - clock-names: should be "extclk"
+ - clocks: 1 or 2 clocks as defined in clock-names below, in that order
+ - clock-names: names for clock inputs, matching the clocks given
+ - "extclk": deprecated, replaced by "txco"
+ - "txco": external reference clock (not a standalone crystal)
+ - "lpo": external low power 32.768 kHz clock
Example: