Re: [PATCH v3 2/3] dt-bindings: phy: Add constants for lan966x serdes

The 10/18/2021 14:28, Rob Herring wrote:

On Fri, Oct 15, 2021 at 02:39:19PM +0200, Horatiu Vultur wrote:

quoted

Lan966x has: 2 integrated PHYs, 3 SerDes and 2 RGMII interfaces. Which
requires to be muxed based on the HW representation.

So add constants for each interface to be able to distinguish them.

Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
---
 include/dt-bindings/phy/phy-lan966x-serdes.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
 create mode 100644 include/dt-bindings/phy/phy-lan966x-serdes.h

diff --git a/include/dt-bindings/phy/phy-lan966x-serdes.h b/include/dt-bindings/phy/phy-lan966x-serdes.h
new file mode 100644
index 000000000000..8a05f93ecf41
--- /dev/null
+++ b/include/dt-bindings/phy/phy-lan966x-serdes.h

@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: (GPL-2.0 OR MIT) */
+
+#ifndef __PHY_LAN966X_SERDES_H__
+#define __PHY_LAN966X_SERDES_H__
+
+#define PHY(x)               (x)
+#define PHY_MAX              PHY(2)
+#define SERDES6G(x)  (PHY_MAX + 1 + (x))
+#define SERDES6G_MAX SERDES6G(3)
+#define RGMII(x)     (SERDES6G_MAX + 1 + (x))
+#define RGMII_MAX    RGMII(2)
+#define SERDES_MAX   (RGMII_MAX + 1)

I still don't understand. #phy-cells description says we have:

<port idx> <serdes idx>

But here it's 3 numbers. How are these defines used to fill in the 2
cells?

Actually they are still only a number. Or maybe I am missing something.

Maybe an example will help:

---
serdes: serdes@e2004010 {
    compatible = "microchip,lan966x-serdes";
    reg = <0xe202c000 0x9c>, <0xe2004010 0x4>;
    #phy-cells = <2>;
};

&port0 {
    ...
    phys = <&serdes 0 SERDES6G(1)>;
    ...
};

&port1 {
    ...
    phys = <&serdes 1 PHY(0)>;
    ...
}

...
---

Here are some existing examples based on which I have created this patch
series:
https://elixir.bootlin.com/linux/v5.15-rc6/source/arch/mips/boot/dts/mscc/ocelot_pcb120.dts#L99
https://elixir.bootlin.com/linux/v5.15-rc6/source/arch/mips/boot/dts/mscc/ocelot.dtsi#L274

Rob

-- 
/Horatiu

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