[PATCH v16 2/6] dt-bindings: soc: amd: amd,pensando-elba-ctrl: Add Pensando SoC Controller

Brad Larson
2023-09-13T21:50:30Z

Support the AMD Pensando Elba SoC Controller which is a SPI connected
device providing a miscellaneous set of essential board control/status
registers. This device is present in all Pensando SoC based designs.

Signed-off-by: Brad Larson <blarson@amd.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
---

v14 changes:
- Change GPL-2.0-only or BSD-2-Clause to GPL-2.0-only OR BSD-2-Clause

v11 changes:
- Fixed the compatible which should have stayed as 'amd,pensando-elba-ctrl',
the commit message, and the filename
- Reference spi-peripheral-props
- Delete spi-max-frequency
- Remove num-cs from example

v10 changes:
- Property renamed to amd,pensando-ctrl
- Driver is renamed and moved to soc/drivers/amd affecting binding
- Delete cs property, driver handles device node creation from parent num-cs
fixing schema reg error in a different way

v9 changes:
- Instead of four nodes, one per chip-select, a single
node is used with reset-cells in the parent.
- No MFD API is used anymore in the driver so it made
sense to move this to drivers/spi.
- This driver is common for all Pensando SoC based designs
so changed the name to pensando-sr.c to not make it Elba
SoC specific.
- Added property cs for the chip-select number which is used
by the driver to create /dev/pensr0.<cs>

---
.../soc/amd/amd,pensando-elba-ctrl.yaml | 58 +++++++++++++++++++
1 file changed, 58 insertions(+)
create mode 100644 Documentation/devicetree/bindings/soc/amd/amd,pensando-elba-ctrl.yaml

diff --git a/Documentation/devicetree/bindings/soc/amd/amd,pensando-elba-ctrl.yaml b/Documentation/devicetree/bindings/soc/amd/amd,pensando-elba-ctrl.yaml
new file mode 100644
index 000000000000..e96978ad1e37
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/amd/amd,pensando-elba-ctrl.yaml
@@ -0,0 +1,58 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/soc/amd/amd,pensando-elba-ctrl.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: AMD Pensando Elba SoC Controller
+
+description:
+ The AMD Pensando Elba SoC Controller is a SPI connected device with essential
+ control/status registers accessed on chip select 0. This device is present
+ in all Pensando SoC based designs.
+
+maintainers:
+ - Brad Larson <blarson@amd.com>
+
+properties:
+ compatible:
+ enum:
+ - amd,pensando-elba-ctrl
+
+ reg:
+ maxItems: 1
+
+ '#reset-cells':
+ const: 1
+
+ interrupts:
+ maxItems: 1
+
+required:
+ - compatible
+ - '#reset-cells'
+
+allOf:
+ - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+unevaluatedProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+ spi {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ system-controller@0 {
+ compatible = "amd,pensando-elba-ctrl";
+ reg = <0>;
+ spi-max-frequency = <12000000>;
+ interrupt-parent = <&porta>;
+ interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
+ #reset-cells = <1>;
+ };
+ };
+
+...
--
2.17.1