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dt: net: enhance DWC EQoS binding to support Tegra186

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The Synopsys DWC EQoS is a configurable IP block which supports multiple
options for bus type, clocking and reset structure, and feature list.
Extend the DT binding to define a "compatible value" for the configuration
contained in NVIDIA's Tegra186 SoC, and define some new properties and
list property entries required by that configuration.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Stephen Warren 2016-09-01 13:02:16 -06:00 committed by Rob Herring
parent 610e128374
commit d4b8e2c5b0
1 changed files with 95 additions and 4 deletions
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99
Documentation/devicetree/bindings/net/snps,dwc-qos-ethernet.txt
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@ -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;