summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorNiklas Cassel <niklas.cassel@axis.com>2017-11-09 18:09:26 +0100
committerDavid S. Miller <davem@davemloft.net>2017-11-11 19:29:08 +0900
commit3ec26c7944a405e9dbd21b31ff46a3b4e6095adb (patch)
tree49af1a18c1bb40863cd226728ab32eb1f0c9def6
parentca29fd7cce5a6444d57fb86517589a1a31c759e1 (diff)
bindings: net: stmmac: correctify note about LPI interrupt
There are two different combined signal for various interrupt events: In EQOS-CORE and EQOS-MTL configurations, mci_intr_o is the interrupt signal. In EQOS-DMA, EQOS-AHB and EQOS-AXI configurations, these interrupt events are combined with the events in the DMA on the sbd_intr_o signal. Depending on configuration, the device tree irq "macirq" will refer to either mci_intr_o or sbd_intr_o. The databook states: "The MAC generates the LPI interrupt when the Tx or Rx side enters or exits the LPI state. The interrupt mci_intr_o (sbd_intr_o in certain configurations) is asserted when the LPI interrupt status is set. When the MAC exits the Rx LPI state, then in addition to the mci_intr_o (sbd_intr_o in certain configurations), the sideband signal lpi_intr_o is asserted. If you do not want to gate-off the application clock during the Rx LPI state, you can leave the lpi_intr_o signal unconnected and use the mci_intr_o (sbd_intr_o in certain configurations) signal to detect Rx LPI exit." Since the "macirq" is always raised when Tx or Rx enters/exits the LPI state, "eth_lpi" must therefore refer to lpi_intr_o, which is only raised when Rx exits the LPI state. Update the DT binding description to reflect reality. Signed-off-by: Niklas Cassel <niklas.cassel@axis.com> Acked-by: Alexandre TORGUE <alexandre.torgue@st.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--Documentation/devicetree/bindings/net/stmmac.txt2
1 files changed, 1 insertions, 1 deletions
diff --git a/Documentation/devicetree/bindings/net/stmmac.txt b/Documentation/devicetree/bindings/net/stmmac.txt
index c3a7be6615c5..3a28a5d8857d 100644
--- a/Documentation/devicetree/bindings/net/stmmac.txt
+++ b/Documentation/devicetree/bindings/net/stmmac.txt
@@ -12,7 +12,7 @@ Required properties:
Valid interrupt names are:
- "macirq" (combined signal for various interrupt events)
- "eth_wake_irq" (the interrupt to manage the remote wake-up packet detection)
- - "eth_lpi" (the interrupt that occurs when Tx or Rx enters/exits LPI state)
+ - "eth_lpi" (the interrupt that occurs when Rx exits the LPI state)
- phy-mode: See ethernet.txt file in the same directory.
- snps,reset-gpio gpio number for phy reset.
- snps,reset-active-low boolean flag to indicate if phy reset is active low.