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Date: Sat, 11 Nov 2017 19:29:47 +0900 (KST) From: David Miller <davem@...emloft.net> To: niklas.cassel@...s.com Cc: robh+dt@...nel.org, mark.rutland@....com, Joao.Pinto@...opsys.com, niklass@...s.com, alexandre.torgue@...com, peppe.cavallaro@...com, treding@...dia.com, netdev@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH net-next] bindings: net: stmmac: correctify note about LPI interrupt From: Niklas Cassel <niklas.cassel@...s.com> Date: Thu, 9 Nov 2017 18:09:26 +0100 > 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@...s.com> Applied.
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