ARM: dts: turris-omnia: add SFP node

Turris Omnia has an SFP cage that, together with WAN PHY, is connected
to eth2 SerDes via a SerDes multiplexor. When a SFP module is present,
the multiplexor switches the SerDes signal from PHY to SFP.

Describe the SFP cage, but leave it disabled. Until phylink has support
for such configuration, we are leaving it to U-Boot to enable SFP and
disable WAN PHY at boot time depending on whether a SFP module is
present.

Signed-off-by: Marek Behún <kabel@kernel.org>
Fixes: 26ca8b52d6e1 ("ARM: dts: add support for Turris Omnia")
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Cc: Russell King - ARM Linux admin <linux@armlinux.org.uk>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Uwe Kleine-König <uwe@kleine-koenig.org>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Gregory CLEMENT <gregory.clement@bootlin.com>
Cc: Andreas Färber <afaerber@suse.de>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: devicetree@vger.kernel.org
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>

diff --git a/arch/arm/boot/dts/armada-385-turris-omnia.dts b/arch/arm/boot/dts/armada-385-turris-omnia.dts
index 7ccebf7..aea07b3 100644 (file)
--- a/arch/arm/boot/dts/armada-385-turris-omnia.dts
+++ b/arch/arm/boot/dts/armada-385-turris-omnia.dts
@@ -82,6 +82,24 @@
                        };
                };
        };
+
+       sfp: sfp {
+               compatible = "sff,sfp";
+               i2c-bus = <&sfp_i2c>;
+               tx-fault-gpios = <&pcawan 0 GPIO_ACTIVE_HIGH>;
+               tx-disable-gpios = <&pcawan 1 GPIO_ACTIVE_HIGH>;
+               rate-select0-gpios = <&pcawan 2 GPIO_ACTIVE_HIGH>;
+               los-gpios = <&pcawan 3 GPIO_ACTIVE_HIGH>;
+               mod-def0-gpios = <&pcawan 4 GPIO_ACTIVE_LOW>;
+               maximum-power-milliwatt = <3000>;
+
+               /*
+                * For now this has to be enabled at boot time by U-Boot when
+                * a SFP module is present. Read more in the comment in the
+                * eth2 node below.
+                */
+               status = "disabled";
+       };
 };
 
 &bm {
@@ -126,10 +144,20 @@
 
 /* WAN port */
 &eth2 {
+       /*
+        * eth2 is connected via a multiplexor to both the SFP cage and to
+        * ethernet-phy@1. The multiplexor switches the signal to SFP cage when
+        * a SFP module is present, as determined by the mode-def0 GPIO.
+        *
+        * Until kernel supports this configuration properly, in case SFP module
+        * is present, U-Boot has to enable the sfp node above, remove phy
+        * handle and add managed = "in-band-status" property.
+        */
        status = "okay";
        phy-mode = "sgmii";
        phy = <&phy1>;
        phys = <&comphy5 2>;
+       sfp = <&sfp>;
        buffer-manager = <&bm>;
        bm,pool-long = <2>;
        bm,pool-short = <3>;
@@ -195,7 +223,7 @@
                        /* routed to PCIe2 connector (CN62A) */
                };
 
-               i2c@4 {
+               sfp_i2c: i2c@4 {
                        #address-cells = <1>;
                        #size-cells = <0>;
                        reg = <4>;