linux-kernel - [PATCH v3 2/4] dt-bindings: nvmem: Add properties needed for blowing fuses

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Message-Id: <20200617074930.v3.2.I3b5c3bfaf5fb2d28d63f1b5ee92980900e3f8251@changeid>
Date:   Wed, 17 Jun 2020 07:51:14 -0700
From:   Douglas Anderson <dianders@...omium.org>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Gross <agross@...nel.org>
Cc:     dhavalp@...eaurora.org, mturney@...eaurora.org,
        rnayak@...eaurora.org, Ravi Kumar Bokka <rbokka@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, saiprakash.ranjan@...eaurora.org,
        sparate@...eaurora.org, mkurumel@...eaurora.org,
        Douglas Anderson <dianders@...omium.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 2/4] dt-bindings: nvmem: Add properties needed for blowing fuses

From: Ravi Kumar Bokka <rbokka@...eaurora.org>

On some systems it's possible to actually blow the fuses in the qfprom
from the kernel.  Add properties to support that.

NOTE: Whether this is possible depends on the BIOS settings and
whether the kernel has permissions here, so not all boards will be
able to blow fuses in the kernel.

Signed-off-by: Ravi Kumar Bokka <rbokka@...eaurora.org>
Signed-off-by: Douglas Anderson <dianders@...omium.org>
---

Changes in v3:
- Add an extra reg range (at 0x6000 offset for SoCs checked)
- Define two options for reg: 1 item or 4 items.
- No reg-names.
- Add "clocks" and "clock-names" to list of properties.
- Clock is now "sec", not "secclk".
- Add "vcc-supply" to list of properties.
- Fixed up example.

 .../bindings/nvmem/qcom,qfprom.yaml           | 45 ++++++++++++++++++-
 1 file changed, 43 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/nvmem/qcom,qfprom.yaml b/Documentation/devicetree/bindings/nvmem/qcom,qfprom.yaml
index 5efa5e7c4d81..b195212c6193 100644
--- a/Documentation/devicetree/bindings/nvmem/qcom,qfprom.yaml
+++ b/Documentation/devicetree/bindings/nvmem/qcom,qfprom.yaml
@@ -17,8 +17,27 @@ properties:
     const: qcom,qfprom
 
   reg:
-    items:
-      - description: The corrected region.
+    # If the QFPROM is read-only OS image then only the corrected region
+    # needs to be provided.  If the QFPROM is writable then all 4 regions
+    # must be provided.
+    oneOf:
+      - items:
+          - description: The corrected region.
+      - items:
+          - description: The corrected region.
+          - description: The raw region.
+          - description: The config region.
+          - description: The security control region.
+
+  # Clock must be provided if QFPROM is writable from the OS image.
+  clocks:
+    maxItems: 1
+  clock-names:
+    const: sec
+
+  # Supply reference must be provided if QFPROM is writable from the OS image.
+  vcc-supply:
+    description: Our power supply.
 
   # Needed if any child nodes are present.
   "#address-cells":
@@ -31,6 +50,28 @@ required:
    - reg
 
 examples:
+  - |
+    #include <dt-bindings/clock/qcom,gcc-sc7180.h>
+
+    efuse@...000 {
+      compatible = "qcom,qfprom";
+      reg = <0 0x00784000 0 0x8ff>,
+            <0 0x00780000 0 0x7a0>,
+            <0 0x00782000 0 0x100>,
+            <0 0x00786000 0 0x1fff>;
+      clocks = <&gcc GCC_SEC_CTRL_CLK_SRC>;
+      clock-names = "sec";
+      #address-cells = <1>;
+      #size-cells = <1>;
+
+      vcc-supply = <&vreg_l11a_1p8>;
+
+      hstx-trim-primary@25b {
+        reg = <0x25b 0x1>;
+        bits = <1 3>;
+      };
+    };
+
   - |
     efuse@...000 {
       compatible = "qcom,qfprom";
-- 
2.27.0.290.gba653c62da-goog