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From: Florian Fainelli <f.fainelli@gmail.com>
To: linux-arm-kernel@lists.infradead.org
Cc: Florian Fainelli <f.fainelli@gmail.com>,
	Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>, Ray Jui <rjui@broadcom.com>,
	Scott Branden <sbranden@broadcom.com>,
	Jon Mason <jonmason@broadcom.com>,
	bcm-kernel-feedback-list@broadcom.com (maintainer:BROADCOM IPROC
	ARM ARCHITECTURE),
	devicetree@vger.kernel.org (open list:OPEN FIRMWARE AND
	FLATTENED DEVICE TREE BINDINGS),
	linux-kernel@vger.kernel.org (open list),
	andrew@lunn.ch, rmk+kernel@armlinux.org.uk
Subject: [PATCH v3 1/3] ARM: dts: NSP: Enable SFP on bcm958625hr
Date: Fri, 31 Aug 2018 12:20:37 -0700	[thread overview]
Message-ID: <20180831192039.11842-2-f.fainelli@gmail.com> (raw)
In-Reply-To: <20180831192039.11842-1-f.fainelli@gmail.com>

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>
---
 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


WARNING: multiple messages have this Message-ID (diff)
From: Florian Fainelli <f.fainelli@gmail.com>
To: linux-arm-kernel@lists.infradead.org
Cc: Florian Fainelli <f.fainelli@gmail.com>,
	Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>, Ray Jui <rjui@broadcom.com>,
	Scott Branden <sbranden@broadcom.com>,
	Jon Mason <jonmason@broadcom.com>,
	"maintainer:BROADCOM IPROC ARM ARCHITECTURE"
	<bcm-kernel-feedback-list@broadcom.com>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
	<devicetree@vger.kernel.org>,
	open list <linux-kernel@vger.kernel.org>,
	andrew@lunn.ch, rmk+kernel@armlinux.org.uk
Subject: [PATCH v3 1/3] ARM: dts: NSP: Enable SFP on bcm958625hr
Date: Fri, 31 Aug 2018 12:20:37 -0700	[thread overview]
Message-ID: <20180831192039.11842-2-f.fainelli@gmail.com> (raw)
In-Reply-To: <20180831192039.11842-1-f.fainelli@gmail.com>

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>
---
 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

WARNING: multiple messages have this Message-ID (diff)
From: f.fainelli@gmail.com (Florian Fainelli)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v3 1/3] ARM: dts: NSP: Enable SFP on bcm958625hr
Date: Fri, 31 Aug 2018 12:20:37 -0700	[thread overview]
Message-ID: <20180831192039.11842-2-f.fainelli@gmail.com> (raw)
In-Reply-To: <20180831192039.11842-1-f.fainelli@gmail.com>

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

  reply	other threads:[~2018-08-31 19:20 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-31 19:20 [PATCH v3 0/3] ARM: NSP updates to support switch interrupts/SFP Florian Fainelli
2018-08-31 19:20 ` Florian Fainelli
2018-08-31 19:20 ` Florian Fainelli
2018-08-31 19:20 ` Florian Fainelli [this message]
2018-08-31 19:20   ` [PATCH v3 1/3] ARM: dts: NSP: Enable SFP on bcm958625hr Florian Fainelli
2018-08-31 19:20   ` Florian Fainelli
2018-09-04 20:39   ` Ray Jui
2018-09-04 20:39     ` Ray Jui
2018-09-04 20:39     ` Ray Jui
2018-08-31 19:20 ` [PATCH v3 2/3] dt-bindings: net: dsa: Document B53 SRAB interrupts and registers Florian Fainelli
2018-08-31 19:20   ` Florian Fainelli
2018-08-31 19:20   ` Florian Fainelli
2018-09-10 19:57   ` Rob Herring
2018-09-10 19:57     ` Rob Herring
2018-09-10 19:57     ` Rob Herring
2018-08-31 19:20 ` [PATCH v3 3/3] ARM: dts: NSP: Wire up switch interrupts Florian Fainelli
2018-08-31 19:20   ` Florian Fainelli
2018-08-31 19:20   ` Florian Fainelli
2018-09-13 18:10 ` [PATCH v3 0/3] ARM: NSP updates to support switch interrupts/SFP Florian Fainelli
2018-09-13 18:10   ` Florian Fainelli
2018-09-13 18:10   ` Florian Fainelli

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