On Wed, Aug 12, 2020 at 10:20 PM Al Cooper [off-list ref] wrote:

Add DT bindings for the Broadcom USB pin map driver. This driver allows
some USB input and output signals to be mapped to any GPIO instead
of the normal dedicated pins to/from the XHCI controller.

Signed-off-by: Al Cooper <alcooperx@gmail.com>

(...)

+title: Broadcom USB pin map Controller Device Tree Bindings
+
+maintainers:
+  - Al Cooper [off-list ref]
+
+properties:
+  compatible:
+      items:
+          - const: brcm,usb-pinmap
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+    description: Must be defined if any out-gpios are specified.
+
+  in-gpios:
+    description: Array of one or more GPIO pins used for input signals.
+
+  in-names:
+    description: Array of input signal names, one per gpio in in-gpios.
+
+  in-masks:
+    description: Array of enable and mask pairs, one per gpio in-gpios.
+
+  out-gpios:
+    description: Array of one or more GPIO pins used for output signals.
+
+  out-names:
+    description: Array of output signal names, one per gpio in out-gpios.
+
+  out-masks:
+    description: Array of enable, value, changed and clear masks, one
+      per gpio in out-gpios.
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    usb_pinmap: usb-pinmap@22000d0 {
+        compatible = "brcm,usb-pinmap";
+        reg = <0x22000d0 0x4>;
+        in-gpios = <&gpio 18 0>, <&gpio 19 0>;
+        in-names = "VBUS", "PWRFLT";
+        in-masks = <0x8000 0x40000 0x10000 0x80000>;
+        out-gpios = <&gpio 20 0>;
+        out-names = "PWRON";
+        out-masks = <0x20000 0x800000 0x400000 0x200000>;
+        interrupts = <0x0 0xb2 0x4>;
+    };

Wow look at that.

This looks very much like Geert's just invented GPIO aggregator.
But in hardware!

See:
drivers/gpio/gpio-aggregator.c

I think Geert is intending to add bindings to the aggregator, and
while I do think this should be its own driver (in drivers/usb) these
bindings and whatever Geert want to use for the aggregator
should certainly be the same.

Geert what do you think?

Here is the actual driver:
https://lore.kernel.org/linux-usb/20200812202018.49046-3-alcooperx@gmail.com/ (local)

Yours,
Linus Walleij

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