From: Florian Fainelli <f.fainelli@gmail.com>
Date: Fri, 31 Aug 2018 19:20:37 +0000 (-0700)
Subject: ARM: dts: NSP: Enable SFP on bcm958625hr
X-Git-Tag: v4.20-rc1~66^2~56^2~4
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=046ead61dc6973da049e606485858cdbb601b1e0;p=linux.git

ARM: dts: NSP: Enable SFP on bcm958625hr

Enable the SFP connected to port 5 of the switch and wire up all GPIOs
to the SFP cage. Because of a hardware limitation of the i2c controller
on the iProc SoCs which prevents large i2c (> 63 bytes) transactions to
work, we use the i2c-gpio interface instead, which does not have that
limitation. This allows us to read the SFP module EEPROM, which would
not be possible otherwise since it exceeds that size during a single
read transfer.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Ray Jui <ray.jui@broadcom.com>
---

diff --git a/arch/arm/boot/dts/bcm958625hr.dts b/arch/arm/boot/dts/bcm958625hr.dts
index ea3fc194f8f3..a53a2f629d74 100644
--- a/arch/arm/boot/dts/bcm958625hr.dts
+++ b/arch/arm/boot/dts/bcm958625hr.dts
@@ -58,6 +58,24 @@ gpio-restart {
 		open-source;
 		priority = <200>;
 	};
+
+	/* Hardware I2C block cannot do more than 63 bytes per transfer,
+	 * which would prevent reading from a SFP's EEPROM (256 byte).
+	 */
+	i2c1: i2c {
+		compatible = "i2c-gpio";
+		sda-gpios = <&gpioa 5 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+		scl-gpios = <&gpioa 4 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+	};
+
+	sfp: sfp {
+		compatible = "sff,sfp";
+		i2c-bus = <&i2c1>;
+		mod-def0-gpios = <&gpioa 28 GPIO_ACTIVE_LOW>;
+		los-gpios = <&gpioa 24 GPIO_ACTIVE_HIGH>;
+		tx-fault-gpios = <&gpioa 30 GPIO_ACTIVE_HIGH>;
+		tx-disable-gpios = <&gpioa 26 GPIO_ACTIVE_HIGH>;
+	};
 };
 
 &amac0 {
@@ -210,6 +228,14 @@ port@4 {
 			reg = <4>;
 		};
 
+		port@5 {
+			label = "sfp";
+			phy-mode = "sgmii";
+			reg = <5>;
+			sfp = <&sfp>;
+			managed = "in-band-status";
+		};
+
 		port@8 {
 			ethernet = <&amac2>;
 			label = "cpu";