linux-kernel - [PATCH v3 1/3] ARM: dts: NSP: Enable SFP on bcm958625hr

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Date:   Fri, 31 Aug 2018 12:20:37 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        Jon Mason <jonmason@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com (maintainer:BROADCOM IPROC ARM
        ARCHITECTURE),
        devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED
        DEVICE TREE BINDINGS), linux-kernel@...r.kernel.org (open list),
        andrew@...n.ch, rmk+kernel@...linux.org.uk
Subject: [PATCH v3 1/3] 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@...il.com>
---
 arch/arm/boot/dts/bcm958625hr.dts | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

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 @@
 		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 @@
 			reg = <4>;
 		};
 
+		port@5 {
+			label = "sfp";
+			phy-mode = "sgmii";
+			reg = <5>;
+			sfp = <&sfp>;
+			managed = "in-band-status";
+		};
+
 		port@8 {
 			ethernet = <&amac2>;
 			label = "cpu";
-- 
2.17.1