[PATCH 1/2] dt-bindings: phy: dp83867: provide a workaround for incorrect RX_CTRL pin strap
From: Sekhar Nori <hidden>
Date: 2017-07-04 10:53:23
Also in:
linux-devicetree, linux-omap
Subsystem:
networking drivers, open firmware and flattened device tree bindings, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
From: Murali Karicheri <redacted> The data manual for DP83867IR/CR, SNLS484E[1], revised march 2017, advises that strapping RX_DV/RX_CTRL pin in mode 1 and 2 is not supported (see note below Table 5 (4-Level Strap Pins)). It further advises that if a board has this pin strapped in mode 1 and mode 2, then to ensure proper operation of the PHY, a software workaround must be implemented. Since it is not possible to detect in software if RX_DV/RX_CTRL pin is incorrectly strapped, add a device-tree property for the board to advertise this and allow corrective action in software. [1] http://www.ti.com/lit/ds/snls484e/snls484e.pdf Signed-off-by: Murali Karicheri <redacted> [nsekhar-l0cyMroinI0@public.gmane.org: rebase to mainline, split documentation into separate patch] Signed-off-by: Sekhar Nori <redacted> --- Documentation/devicetree/bindings/net/ti,dp83867.txt | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/Documentation/devicetree/bindings/net/ti,dp83867.txt b/Documentation/devicetree/bindings/net/ti,dp83867.txt
index afe9630a5e7d..02c4353b5cf2 100644
--- a/Documentation/devicetree/bindings/net/ti,dp83867.txt
+++ b/Documentation/devicetree/bindings/net/ti,dp83867.txt@@ -18,6 +18,13 @@ Optional property: - ti,max-output-impedance - MAC Interface Impedance control to set the programmable output impedance to maximum value (70 ohms). + - ti,dp83867-rxctrl-strap-quirk - This denotes the fact that the + board has RX_DV/RX_CTRL pin strapped in + mode 1 or 2. To ensure PHY operation, + there are specific actions that + software needs to take when this pin is + strapped in these modes. See data manual + for details. Note: ti,min-output-impedance and ti,max-output-impedance are mutually exclusive. When both properties are present ti,max-output-impedance
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2.9.0
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