diff options
Diffstat (limited to 'Bindings/net/snps,dwc-qos-ethernet.txt')
| -rw-r--r-- | Bindings/net/snps,dwc-qos-ethernet.txt | 99 |
1 files changed, 95 insertions, 4 deletions
diff --git a/Bindings/net/snps,dwc-qos-ethernet.txt b/Bindings/net/snps,dwc-qos-ethernet.txt index 51f8d2eba8d8..d93f71ce8346 100644 --- a/Bindings/net/snps,dwc-qos-ethernet.txt +++ b/Bindings/net/snps,dwc-qos-ethernet.txt @@ -1,21 +1,111 @@ * Synopsys DWC Ethernet QoS IP version 4.10 driver (GMAC) +This binding supports the Synopsys Designware Ethernet QoS (Quality Of Service) +IP block. The IP supports multiple options for bus type, clocking and reset +structure, and feature list. Consequently, a number of properties and list +entries in properties are marked as optional, or only required in specific HW +configurations. Required properties: -- compatible: Should be "snps,dwc-qos-ethernet-4.10" +- compatible: One of: + - "axis,artpec6-eqos", "snps,dwc-qos-ethernet-4.10" + Represents the IP core when integrated into the Axis ARTPEC-6 SoC. + - "nvidia,tegra186-eqos", "snps,dwc-qos-ethernet-4.10" + Represents the IP core when integrated into the NVIDIA Tegra186 SoC. + - "snps,dwc-qos-ethernet-4.10" + This combination is deprecated. It should be treated as equivalent to + "axis,artpec6-eqos", "snps,dwc-qos-ethernet-4.10". It is supported to be + compatible with earlier revisions of this binding. - reg: Address and length of the register set for the device -- clocks: Phandles to the reference clock and the bus clock -- clock-names: Should be "phy_ref_clk" for the reference clock and "apb_pclk" - for the bus clock. +- clocks: Phandle and clock specifiers for each entry in clock-names, in the + same order. See ../clock/clock-bindings.txt. +- clock-names: May contain any/all of the following depending on the IP + configuration, in any order: + - "tx" + The EQOS transmit path clock. The HW signal name is clk_tx_i. + In some configurations (e.g. GMII/RGMII), this clock also drives the PHY TX + path. In other configurations, other clocks (such as tx_125, rmii) may + drive the PHY TX path. + - "rx" + The EQOS receive path clock. The HW signal name is clk_rx_i. + In some configurations (e.g. GMII/RGMII), this clock is derived from the + PHY's RX clock output. In other configurations, other clocks (such as + rx_125, rmii) may drive the EQOS RX path. + In cases where the PHY clock is directly fed into the EQOS receive path + without intervening logic, the DT need not represent this clock, since it + is assumed to be fully under the control of the PHY device/driver. In + cases where SoC integration adds additional logic to this path, such as a + SW-controlled clock gate, this clock should be represented in DT. + - "slave_bus" + The CPU/slave-bus (CSR) interface clock. This applies to any bus type; + APB, AHB, AXI, etc. The HW signal name is hclk_i (AHB) or clk_csr_i (other + buses). + - "master_bus" + The master bus interface clock. Only required in configurations that use a + separate clock for the master and slave bus interfaces. The HW signal name + is hclk_i (AHB) or aclk_i (AXI). + - "ptp_ref" + The PTP reference clock. The HW signal name is clk_ptp_ref_i. + - "phy_ref_clk" + This clock is deprecated and should not be used by new compatible values. + It is equivalent to "tx". + - "apb_pclk" + This clock is deprecated and should not be used by new compatible values. + It is equivalent to "slave_bus". + + Note: Support for additional IP configurations may require adding the + following clocks to this list in the future: clk_rx_125_i, clk_tx_125_i, + clk_pmarx_0_i, clk_pmarx1_i, clk_rmii_i, clk_revmii_rx_i, clk_revmii_tx_i. + Configurations exist where multiple similar clocks are used at once, e.g. all + of clk_rx_125_i, clk_pmarx_0_i, clk_pmarx1_i. For this reason it is best to + extend the binding with a separate clock-names entry for each of those RX + clocks, rather than repurposing the existing "rx" clock-names entry as a + generic/logical clock in a similar fashion to "master_bus" and "slave_bus". + This will allow easy support for configurations that support multiple PHY + interfaces using a mux, and hence need to have explicit control over + specific RX clocks. + + The following compatible values require the following set of clocks: + - "nvidia,tegra186-eqos", "snps,dwc-qos-ethernet-4.10": + - "slave_bus" + - "master_bus" + - "rx" + - "tx" + - "ptp_ref" + - "axis,artpec6-eqos", "snps,dwc-qos-ethernet-4.10": + - "slave_bus" + - "master_bus" + - "tx" + - "ptp_ref" + - "snps,dwc-qos-ethernet-4.10" (deprecated): + - "phy_ref_clk" + - "apb_clk" - interrupt-parent: Should be the phandle for the interrupt controller that services interrupts for this device - interrupts: Should contain the core's combined interrupt signal - phy-mode: See ethernet.txt file in the same directory +- resets: Phandle and reset specifiers for each entry in reset-names, in the + same order. See ../reset/reset.txt. +- reset-names: May contain any/all of the following depending on the IP + configuration, in any order: + - "eqos". The reset to the entire module. The HW signal name is hreset_n + (AHB) or aresetn_i (AXI). + + The following compatible values require the following set of resets: + (the reset properties may be omitted if empty) + - "nvidia,tegra186-eqos", "snps,dwc-qos-ethernet-4.10": + - "eqos". + - "axis,artpec6-eqos", "snps,dwc-qos-ethernet-4.10": + - None. + - "snps,dwc-qos-ethernet-4.10" (deprecated): + - None. Optional properties: - dma-coherent: Present if dma operations are coherent - mac-address: See ethernet.txt in the same directory - local-mac-address: See ethernet.txt in the same directory +- phy-reset-gpios: Phandle and specifier for any GPIO used to reset the PHY. + See ../gpio/gpio.txt. - snps,en-lpi: If present it enables use of the AXI low-power interface - snps,write-requests: Number of write requests that the AXI port can issue. It depends on the SoC configuration. @@ -52,6 +142,7 @@ ethernet2@40010000 { reg = <0x40010000 0x4000>; phy-handle = <&phy2>; phy-mode = "gmii"; + phy-reset-gpios = <&gpioctlr 43 GPIO_ACTIVE_LOW>; snps,en-tx-lpi-clockgating; snps,en-lpi; |