dt: bindings: add MARVELL's sd8xxx wireless device

Add device tree binding documentation for MARVELL's sd8xxx
(sd8897 and sd8997) wlan chip.

Signed-off-by: Xinming Hu <huxm@marvell.com>
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

diff --git a/Documentation/devicetree/bindings/net/wireless/marvell-sd8xxx.txt b/Documentation/devicetree/bindings/net/wireless/marvell-sd8xxx.txt
new file mode 100644 (file)
index 0000000..c421aba
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+++ b/Documentation/devicetree/bindings/net/wireless/marvell-sd8xxx.txt
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+Marvell 8897/8997 (sd8897/sd8997) SDIO devices
+------
+
+This node provides properties for controlling the marvell sdio 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 one of the following:
+       * "marvell,sd8897"
+       * "marvell,sd8997"
+
+Optional properties:
+
+  - marvell,caldata* : A series of properties with marvell,caldata prefix,
+                     represent calibration data downloaded to the device during
+                     initialization. This is an array of unsigned 8-bit values.
+                     the properties should follow below property name and
+                     corresponding array length:
+       "marvell,caldata-txpwrlimit-2g" (length = 566).
+       "marvell,caldata-txpwrlimit-5g-sub0" (length = 502).
+       "marvell,caldata-txpwrlimit-5g-sub1" (length = 688).
+       "marvell,caldata-txpwrlimit-5g-sub2" (length = 750).
+       "marvell,caldata-txpwrlimit-5g-sub3" (length = 502).
+  - marvell,wakeup-pin : a wakeup pin number of wifi chip which will be configured
+                     to firmware. Firmware will wakeup the host using this pin
+                     during suspend/resume.
+  - interrupt-parent: phandle of the parent interrupt controller
+  - interrupts : interrupt pin number to the cpu. driver will request an irq based on
+                this interrupt number. during system suspend, the irq will be enabled
+                so that the wifi chip can wakeup host platform under certain condition.
+                during system resume, the irq will be disabled to make sure
+                unnecessary interrupt is not received.
+
+Example:
+
+Tx power limit calibration data is configured in below example.
+The calibration data is an array of unsigned values, the length
+can vary between hw versions.
+IRQ pin 38 is used as system wakeup source interrupt. wakeup pin 3 is configured
+so that firmware can wakeup host using this device side pin.
+
+&mmc3 {
+       status = "okay";
+       vmmc-supply = <&wlan_en_reg>;
+       bus-width = <4>;
+       cap-power-off-card;
+       keep-power-in-suspend;
+
+       #address-cells = <1>;
+       #size-cells = <0>;
+       mwifiex: wifi@1 {
+               compatible = "marvell,sd8897";
+               reg = <1>;
+               interrupt-parent = <&pio>;
+               interrupts = <38 IRQ_TYPE_LEVEL_LOW>;
+
+               marvell,caldata_00_txpwrlimit_2g_cfg_set = /bits/ 8 <
+       0x01 0x00 0x06 0x00 0x08 0x02 0x89 0x01>;
+               marvell,wakeup-pin = <3>;
+       };
+};