From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lars Persson Subject: Re: [PATCH V3] dt: net: enhance DWC EQoS binding to support Tegra186 Date: Fri, 2 Sep 2016 09:56:41 +0200 Message-ID: References: <20160901190216.5643-1-swarren@wwwdotorg.org> Mime-Version: 1.0 Content-Type: text/plain; charset="windows-1252"; format=flowed Content-Transfer-Encoding: 7bit Cc: , , , Stephen Warren To: Stephen Warren , Lars Persson , Rob Herring , Mark Rutland Return-path: In-Reply-To: <20160901190216.5643-1-swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org> Sender: linux-tegra-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: netdev.vger.kernel.org On 09/01/2016 09:02 PM, Stephen Warren wrote: > From: Stephen Warren > > 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 > --- > v3: > * Document legacy clock-names entries separately, and make it obvious > they're deprecated. > * Reword the description of the "rx" clock to better describe the HW. > * Add some extra guidance for future extensions of the binding to cover > configurations where additional RX clocks are required. > * Explicitly document the list of clocks and resets for every compatible > value; don't miss any out. > v2: > * Add an explicit compatible value for the Axis SoC's version of the EQOS > IP; this allows the driver to handle any SoC-specific integration quirks > that are required, rather than only knowing about the IP block in > isolation. This is good general DT practice. The existing value is still > documented to support existing DTs. > * Reworked the list of clocks the binding requires: > - Combined "tx" and "phy_ref_clk"; for GMII/RGMII configurations, these > are the same thing. > - Added extra description to the "rx" and "tx" clocks, to make it clear > exactly which HW clock they represent. > - Made the new "tx" and "slave_bus" names more prominent than the > original "phy_ref_clk" and "apb_pclk". The new names are more generic > and should work for any enhanced version of the binding (e.g. to > support additional PHY types). New compatible values will hopefully > choose to require the new names. > * Added a couple extra clocks to the list that may need to be supported in > future binding revisions. > * Fixed a typo; "clocks" -> "resets". > --- > .../bindings/net/snps,dwc-qos-ethernet.txt | 99 +++++++++++++++++++++- > 1 file changed, 95 insertions(+), 4 deletions(-) > > diff --git a/Documentation/devicetree/bindings/net/snps,dwc-qos-ethernet.txt b/Documentation/devicetree/bindings/net/snps,dwc-qos-ethernet.txt > index 51f8d2eba8d8..d93f71ce8346 100644 > --- a/Documentation/devicetree/bindings/net/snps,dwc-qos-ethernet.txt > +++ b/Documentation/devicetree/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; > Acked-by: Lars Persson