linux-kernel - [PATCH v6 06/17] dt-bindings: mfd: amd,pensando-elbasr: Add AMD Pensando Elba System Resource chip

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Message-Id: <20220820195750.70861-7-brad@pensando.io>
Date:   Sat, 20 Aug 2022 12:57:39 -0700
From:   Brad Larson <brad@...sando.io>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org,
        adrian.hunter@...el.com, alcooperx@...il.com,
        andy.shevchenko@...il.com, arnd@...db.de, brad@...sando.io,
        blarson@....com, brijeshkumar.singh@....com,
        catalin.marinas@....com, gsomlo@...il.com, gerg@...ux-m68k.org,
        krzk@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        lee.jones@...aro.org, broonie@...nel.org,
        yamada.masahiro@...ionext.com, p.zabel@...gutronix.de,
        piotrs@...ence.com, p.yadav@...com, rdunlap@...radead.org,
        robh+dt@...nel.org, samuel@...lland.org, fancer.lancer@...il.com,
        suravee.suthikulpanit@....com, thomas.lendacky@....com,
        ulf.hansson@...aro.org, will@...nel.org, devicetree@...r.kernel.org
Subject: [PATCH v6 06/17] dt-bindings: mfd: amd,pensando-elbasr: Add AMD Pensando Elba System Resource chip

From: Brad Larson <blarson@....com>

Add support for the AMD Pensando Elba SoC System Resource chip
using the SPI interface.  The Elba SR is a Multi-function Device
supporting device register access using CS0, smbus interface for
FRU and board peripherals using CS1, dual Lattice I2C masters for
transceiver management using CS2, and CS3 for flash access.

Signed-off-by: Brad Larson <blarson@....com>
---
 .../bindings/mfd/amd,pensando-elbasr.yaml     | 97 +++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mfd/amd,pensando-elbasr.yaml

diff --git a/Documentation/devicetree/bindings/mfd/amd,pensando-elbasr.yaml b/Documentation/devicetree/bindings/mfd/amd,pensando-elbasr.yaml
new file mode 100644
index 000000000000..ded347c3352c
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/amd,pensando-elbasr.yaml
@@ -0,0 +1,97 @@
+# SPDX-License-Identifier: (GPL-2.0-only or BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/amd,pensando-elbasr.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: AMD Pensando Elba SoC Resource Controller bindings
+
+description: |
+  AMD Pensando Elba SoC Resource Controller is a set of
+  miscellaneous control/status registers accessed on CS0,
+  a designware i2c master/slave on CS1, a Lattice rd1173
+  dual i2c master on CS2, and flash on CS3.  The /dev interfaces
+  created are /dev/pensr0.<CS>.  Hardware reset of the eMMC
+  is implemented by a sub-device reset-controller which accesses
+  a CS0 control register.
+
+maintainers:
+  - Brad Larson <blarson@....com>
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - amd,pensando-elbasr
+
+  spi-max-frequency:
+    description: Maximum SPI frequency of the device in Hz.
+
+  reg:
+    maxItems: 1
+
+  '#address-cells':
+    const: 1
+
+  '#size-cells':
+    const: 0
+
+  interrupts:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - spi-max-frequency
+
+patternProperties:
+  '^reset-controller@[a-f0-9]+$':
+    $ref: /schemas/reset/amd,pensando-elbasr-reset.yaml
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        num-cs = <4>;
+
+        sysc: system-controller@0 {
+            compatible = "amd,pensando-elbasr";
+            reg = <0>;
+            #address-cells = <1>;
+            #size-cells = <0>;
+            spi-max-frequency = <12000000>;
+
+            rstc: reset-controller@0 {
+                compatible = "amd,pensando-elbasr-reset";
+                reg = <0>;
+                #reset-cells = <1>;
+            };
+        };
+
+        i2c1: i2c@1 {
+            compatible = "amd,pensando-elbasr";
+            reg = <1>;
+            spi-max-frequency = <12000000>;
+        };
+
+        i2c2: i2c@2 {
+            compatible = "amd,pensando-elbasr";
+            reg = <2>;
+            spi-max-frequency = <12000000>;
+            interrupt-parent = <&porta>;
+            interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
+        };
+
+        flash@3 {
+            compatible = "amd,pensando-elbasr";
+            reg = <3>;
+            spi-max-frequency = <12000000>;
+        };
+    };
+
+...
-- 
2.17.1