v3
- Add MODULE_AUTHOR(), LICENSE and DESCRIPTION() so the driver
can be built as a module.
- Improve Kconfig default entry
v2
- Move file from drivers/usb/host to drivers/usb/misc
- Combine Kconfig/Makefile patch and new driver patch
- Fixed bindings .yaml document based on feedback from Rob Herring
- NOTE: There were suggestions to use a pinmux driver or
GPIO aggregator, but I think agreement was reached that
they weren't a good fit.
The Broadcom 7211 has new functionality that allows some USB low
speed side band signals, that go from the XHCI host controller to
pins on the chip, to be remapped to use any GPIO pin instead of the
limited set selectable by hardware. This can be done without changing
the standard driver for the host controller. There is currently
support for three USB signals, PWRON, VBUS_PRESENT and PWRFLT. This
driver will allow the remapping of any of these three signals based
on settings in the Device Tree node for the driver. The driver was
written so that it could handle additional signals added in the
future by just adding the correct properties to the DT node.
Al Cooper (2):
dt-bindings: Add support for Broadcom USB pin map driver
usb: Add driver to allow any GPIO to be used for 7211 USB signals
.../bindings/usb/brcm,usb-pinmap.yaml | 70 ++++
MAINTAINERS | 8 +
drivers/usb/misc/Kconfig | 9 +
drivers/usb/misc/Makefile | 1 +
drivers/usb/misc/brcmstb-usb-pinmap.c | 351 ++++++++++++++++++
5 files changed, 439 insertions(+)
create mode 100644 Documentation/devicetree/bindings/usb/brcm,usb-pinmap.yaml
create mode 100644 drivers/usb/misc/brcmstb-usb-pinmap.c
--
2.17.1
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 <[email protected]>
---
.../bindings/usb/brcm,usb-pinmap.yaml | 70 +++++++++++++++++++
1 file changed, 70 insertions(+)
create mode 100644 Documentation/devicetree/bindings/usb/brcm,usb-pinmap.yaml
diff --git a/Documentation/devicetree/bindings/usb/brcm,usb-pinmap.yaml b/Documentation/devicetree/bindings/usb/brcm,usb-pinmap.yaml
new file mode 100644
index 000000000000..ffa148b9eaa8
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/brcm,usb-pinmap.yaml
@@ -0,0 +1,70 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/usb/brcm,usb-pinmap.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Broadcom USB pin map Controller Device Tree Bindings
+
+maintainers:
+ - Al Cooper <[email protected]>
+
+properties:
+ compatible:
+ items:
+ - const: brcm,usb-pinmap
+
+ reg:
+ maxItems: 1
+
+ interrupts:
+ maxItems: 1
+ description: Interrupt for signals mirrored to out-gpios.
+
+ in-gpios:
+ description: Array of one or two GPIO pins used for input signals.
+
+ brcm,in-functions:
+ $ref: /schemas/types.yaml#/definitions/string-array
+ description: Array of input signal names, one per gpio in in-gpios.
+
+ brcm,in-masks:
+ $ref: /schemas/types.yaml#/definitions/uint32-array
+ description: Array of enable and mask pairs, one per gpio in-gpios.
+
+ out-gpios:
+ description: Array of one GPIO pin used for output signals.
+
+ brcm,out-functions:
+ $ref: /schemas/types.yaml#/definitions/string-array
+ description: Array of output signal names, one per gpio in out-gpios.
+
+ brcm,out-masks:
+ $ref: /schemas/types.yaml#/definitions/uint32-array
+ description: Array of enable, value, changed and clear masks, one
+ per gpio in out-gpios.
+
+required:
+ - compatible
+ - reg
+
+additionalProperties: false
+
+dependencies:
+ in-gpios: [ interrupts ]
+
+examples:
+ - |
+ usb_pinmap: usb-pinmap@22000d0 {
+ compatible = "brcm,usb-pinmap";
+ reg = <0x22000d0 0x4>;
+ in-gpios = <&gpio 18 0>, <&gpio 19 0>;
+ brcm,in-functions = "VBUS", "PWRFLT";
+ brcm,in-masks = <0x8000 0x40000 0x10000 0x80000>;
+ out-gpios = <&gpio 20 0>;
+ brcm,out-functions = "PWRON";
+ brcm,out-masks = <0x20000 0x800000 0x400000 0x200000>;
+ interrupts = <0x0 0xb2 0x4>;
+ };
+
+...
--
2.17.1
On Mon, 12 Oct 2020 16:00:06 -0400, Al Cooper 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 <[email protected]>
> ---
> .../bindings/usb/brcm,usb-pinmap.yaml | 70 +++++++++++++++++++
> 1 file changed, 70 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/usb/brcm,usb-pinmap.yaml
>
Reviewed-by: Rob Herring <[email protected]>