| Message ID | 1470936385-4621-1-git-send-email-hdegoede@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Thu, Aug 11, 2016 at 07:26:25PM +0200, Hans de Goede wrote: > The ESP8089 chips can mostly be enumerated via their sdio interface, > but they are clocked by an external crystal which may differ from one > board to the other. > > This commit adds a binding for the sdio child node for these chips, > allowing to specify the external crystal type (for now, this binding > could be be extended with e.g. OOB irq support later). > > The Android driver for this chip uses a text file with key,value pairs > which gets loaded as firmware to pass this info to the firmware. > The "esp,crystal_26M_en" name is chosen to match the crystal_26M_en > key-name in that text file. > > Note that at this point there only is an out of tree driver for this > hardware, there is no clear timeline / path for merging this. Still > I believe it would be good to specify the binding for this in tree > now, so that any future migration to an in tree driver will not cause > compatiblity issues. > > Cc: Icenowy Zheng <icenowy@aosc.xyz> > Signed-off-by: Hans de Goede <hdegoede@redhat.com> > --- > Changes in v2: > -Use esp,crystal-26M-en instead of esp,crystal_26M_en > --- > .../bindings/net/wireless/esp,esp8089.txt | 31 ++++++++++++++++++++++ > 1 file changed, 31 insertions(+) > create mode 100644 Documentation/devicetree/bindings/net/wireless/esp,esp8089.txt Applied, thanks. Rob -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/Documentation/devicetree/bindings/net/wireless/esp,esp8089.txt b/Documentation/devicetree/bindings/net/wireless/esp,esp8089.txt new file mode 100644 index 0000000..19331bb --- /dev/null +++ b/Documentation/devicetree/bindings/net/wireless/esp,esp8089.txt @@ -0,0 +1,31 @@ +Espressif ESP8089 wireless SDIO devices + +This node provides properties for controlling the ESP8089 wireless device. +The node is expected to be specified as a child node to the SDIO controller +that connects the device to the system. + +Required properties: + + - compatible : Should be "esp,esp8089". + +Optional properties: + - esp,crystal-26M-en: Integer value for the crystal_26M_en firmware parameter + +Example: + +&mmc1 { + #address-cells = <1>; + #size-cells = <0>; + + vmmc-supply = <®_dldo1>; + mmc-pwrseq = <&wifi_pwrseq>; + bus-width = <4>; + non-removable; + status = "okay"; + + esp8089: sdio_wifi@1 { + compatible = "esp,esp8089"; + reg = <1>; + esp,crystal-26M-en = <2>; + }; +};
The ESP8089 chips can mostly be enumerated via their sdio interface, but they are clocked by an external crystal which may differ from one board to the other. This commit adds a binding for the sdio child node for these chips, allowing to specify the external crystal type (for now, this binding could be be extended with e.g. OOB irq support later). The Android driver for this chip uses a text file with key,value pairs which gets loaded as firmware to pass this info to the firmware. The "esp,crystal_26M_en" name is chosen to match the crystal_26M_en key-name in that text file. Note that at this point there only is an out of tree driver for this hardware, there is no clear timeline / path for merging this. Still I believe it would be good to specify the binding for this in tree now, so that any future migration to an in tree driver will not cause compatiblity issues. Cc: Icenowy Zheng <icenowy@aosc.xyz> Signed-off-by: Hans de Goede <hdegoede@redhat.com> --- Changes in v2: -Use esp,crystal-26M-en instead of esp,crystal_26M_en --- .../bindings/net/wireless/esp,esp8089.txt | 31 ++++++++++++++++++++++ 1 file changed, 31 insertions(+) create mode 100644 Documentation/devicetree/bindings/net/wireless/esp,esp8089.txt