netdev - [PATCH v3 2/3] dt-binding: net: sfp binding documentation

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Date:   Sun,  3 Sep 2017 15:31:13 +0300
From:   Baruch Siach <baruch@...s.co.il>
To:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Russell King <rmk+kernel@....linux.org.uk>
Cc:     netdev@...r.kernel.org, devicetree@...r.kernel.org,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        Baruch Siach <baruch@...s.co.il>
Subject: [PATCH v3 2/3] dt-binding: net: sfp binding documentation

Add device-tree binding documentation SFP transceivers. Support for SFP
transceivers has been recently introduced (drivers/net/phy/sfp.c).

Signed-off-by: Baruch Siach <baruch@...s.co.il>
---
v3:
  Mention gpios phandle and specifier
  Mention the polarity of each gpio
  Fix example property names

v2:
  Rename -gpio properties to -gpios
  Rename the rate-select-gpio property to rate-select0-gpios
  Add the rate-select1-gpios property
  Add examples
---
 Documentation/devicetree/bindings/net/sff,sfp.txt | 78 +++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/net/sff,sfp.txt

diff --git a/Documentation/devicetree/bindings/net/sff,sfp.txt b/Documentation/devicetree/bindings/net/sff,sfp.txt
new file mode 100644
index 000000000000..b98ee5945265
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/sff,sfp.txt
@@ -0,0 +1,78 @@
+Small Form Factor (SFF) Committee Small Form-factor Pluggable (SFP)
+Transceiver
+
+Required properties:
+
+- compatible : must be "sff,sfp"
+
+Optional Properties:
+
+- i2c-bus : phandle of an I2C bus controller for the SFP two wire serial
+  interface
+
+- moddef0-gpios : GPIO phandle and a single specifier of the MOD-DEF0 (AKA
+  Mod_ABS) module presence input gpio signal, active (module absent) high
+
+- los-gpios : GPIO phandle and a single specifier of the Receiver Loss of
+  Signal Indication input gpio signal, active (signal lost) high
+
+- tx-fault-gpios : GPIO phandle and a single specifier of the Module
+  Transmitter Fault input gpio signal, active (fault condition) high
+
+- tx-disable-gpios : GPIO phandle and a single specifier of the Transmitter
+  Disable output gpio signal, active (Tx disable) high
+
+- rate-select0-gpios : GPIO phandle and a single specifier of the Rx Signaling
+  Rate Select (AKA RS0) output gpio signal, low: low Rx rate, high: high Rx
+  rate
+
+- rate-select1-gpios : GPIO phandle and a single specifier of the Tx Signaling
+  Rate Select (AKA RS1) output gpio signal (SFP+ only), low: low Tx rate,
+  high: high Tx rate
+
+Example #1: Direct serdes to SFP connection
+
+sfp_eth3: sfp-eth3 {
+	compatible = "sff,sfp";
+	i2c-bus = <&sfp_1g_i2c>;
+	los-gpios = <&cpm_gpio2 22 GPIO_ACTIVE_HIGH>;
+	moddef0-gpios = <&cpm_gpio2 21 GPIO_ACTIVE_LOW>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&cpm_sfp_1g_pins &cps_sfp_1g_pins>;
+	tx-disable-gpios = <&cps_gpio1 24 GPIO_ACTIVE_HIGH>;
+	tx-fault-gpios = <&cpm_gpio2 19 GPIO_ACTIVE_HIGH>;
+};
+
+&cps_emac3 {
+	phy-mode = "sgmii";
+	phy-names = "comphy";
+	phys = <&cps_comphy 5 COMPHY_SGMII2>;
+	sfp = <&sfp_eth3>;
+};
+
+Example #2: Serdes to PHY to SFP connection
+
+sfp_eth0: sfp-eth0 {
+	compatible = "sff,sfp+";
+	i2c-bus = <&sfpp0_i2c>;
+	los-gpios = <&cps_gpio1 28 GPIO_ACTIVE_HIGH>;
+	moddef0-gpios = <&cps_gpio1 27 GPIO_ACTIVE_LOW>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&cps_sfpp0_pins>;
+	tx-disable-gpios = <&cps_gpio1 29 GPIO_ACTIVE_HIGH>;
+	tx-fault-gpios  = <&cps_gpio1 26 GPIO_ACTIVE_HIGH>;
+};
+
+p0_phy: ethernet-phy@0 {
+	compatible = "ethernet-phy-ieee802.3-c45";
+	pinctrl-names = "default";
+	pinctrl-0 = <&cpm_phy0_pins &cps_phy0_pins>;
+	reg = <0>;
+	interrupt = <&cpm_gpio2 18 IRQ_TYPE_EDGE_FALLING>;
+	sfp = <&sfp_eth0>;
+};
+
+&cpm_eth0 {
+	phy = <&p0_phy>;
+	phy-mode = "10gbase-kr";
+};
-- 
2.14.1