linux-kernel - [PATCH v9 06/15] dt-bindings: mfd: amd,pensando-elbasr: Add AMD Pensando System Resource chip

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Message-ID: <20230119035136.21603-7-blarson@amd.com>
Date:   Wed, 18 Jan 2023 19:51:27 -0800
From:   Brad Larson <blarson@....com>
To:     <linux-arm-kernel@...ts.infradead.org>
CC:     <linux-kernel@...r.kernel.org>, <linux-mmc@...r.kernel.org>,
        <linux-spi@...r.kernel.org>, <adrian.hunter@...el.com>,
        <alcooperx@...il.com>, <andy.shevchenko@...il.com>,
        <arnd@...db.de>, <brad@...sando.io>, <blarson@....com>,
        <brendan.higgins@...ux.dev>, <briannorris@...omium.org>,
        <brijeshkumar.singh@....com>, <catalin.marinas@....com>,
        <davidgow@...gle.com>, <gsomlo@...il.com>, <gerg@...ux-m68k.org>,
        <krzk@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <lee@...nel.org>, <lee.jones@...aro.org>, <broonie@...nel.org>,
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        <tonyhuang.sunplus@...il.com>, <ulf.hansson@...aro.org>,
        <vaishnav.a@...com>, <will@...nel.org>,
        <devicetree@...r.kernel.org>
Subject: [PATCH v9 06/15] dt-bindings: mfd: amd,pensando-elbasr: Add AMD Pensando System Resource chip

Add support for the AMD Pensando SoC System Resource chip using the
SPI interface.  The device functions are accessed using four
chip-selects.  This device is present for all Pensando SoC designs.

Signed-off-by: Brad Larson <blarson@....com>
---

Changes since v6:
- 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> 

---
 .../bindings/spi/amd,pensando-sr.yaml         | 68 +++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/spi/amd,pensando-sr.yaml

diff --git a/Documentation/devicetree/bindings/spi/amd,pensando-sr.yaml b/Documentation/devicetree/bindings/spi/amd,pensando-sr.yaml
new file mode 100644
index 000000000000..8504652f6e19
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/amd,pensando-sr.yaml
@@ -0,0 +1,68 @@
+# SPDX-License-Identifier: (GPL-2.0-only or BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/spi/amd,pensando-sr.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: AMD Pensando SoC Resource Controller
+
+description: |
+  AMD Pensando SoC Resource Controller is a set of
+  control/status registers accessed on four chip-selects.
+  This device is present in all Pensando SoC based designs.
+
+maintainers:
+  - Brad Larson <blarson@....com>
+
+properties:
+  compatible:
+    contains:
+      enum:
+        - amd,pensando-sr
+
+  reg:
+    minItems: 1
+
+  cs:
+    minItems: 1
+    maxItems: 4
+    description:
+      Device chip select
+
+  '#reset-cells':
+    const: 1
+
+  interrupts:
+    maxItems: 1
+
+  spi-max-frequency: true
+
+required:
+  - compatible
+  - cs
+  - spi-max-frequency
+  - '#reset-cells'
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        num-cs = <4>;
+
+        system-controller@0 {
+            compatible = "amd,pensando-sr";
+            reg = <0>;
+            cs = <0 1 2 3>;
+            spi-max-frequency = <12000000>;
+            interrupt-parent = <&porta>;
+            interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
+            #reset-cells = <1>;
+        };
+    };
+
+...
-- 
2.17.1