[PATCH v2 0/2] hwrng: exynos: enable GS101 TRNG support

[PATCH v2 0/2] hwrng: exynos: enable GS101 TRNG support

[Tudor Ambarus]

Hi,

I propose the bindings to go through the Samsung tree as well so that we
can match the compatible with the schema when pulling the DT patch.

Thanks!
ta

---
Enable GS101 TRNG support. It works well with the current Exynos850 TRNG
support. Tested on pixel 6 like this:

cat /sys/devices/virtual/misc/hw_random/rng_current
10141400.rng

dd if=/dev/hwrng bs=100000 count=1 > /dev/null
1+0 records in
1+0 records out
100000 bytes (100 kB, 98 KiB) copied, 2.03619 s, 49.1 kB/s

rngtest -c 1000 < /dev/hwrng
rngtest 6.17
...
rngtest: starting FIPS tests...
rngtest: bits received from input: 20000032
rngtest: FIPS 140-2 successes: 1000
rngtest: FIPS 140-2 failures: 0
rngtest: FIPS 140-2(2001-10-10) Monobit: 0
rngtest: FIPS 140-2(2001-10-10) Poker: 0
rngtest: FIPS 140-2(2001-10-10) Runs: 0
rngtest: FIPS 140-2(2001-10-10) Long run: 0
rngtest: FIPS 140-2(2001-10-10) Continuous run: 0
rngtest: input channel speed: (min=380.570; avg=385.422; max=386.964)Kibits/s
rngtest: FIPS tests speed: (min=75.092; avg=81.784; max=84.771)Mibits/s
rngtest: Program run time: 50908949 microseconds

To: Łukasz Stelmach <l.stelmach@samsung.com>
To: Olivia Mackall <olivia@selenic.com>
To: Herbert Xu <herbert@gondor.apana.org.au>
To: Rob Herring <robh@kernel.org>
To: Krzysztof Kozlowski <krzk+dt@kernel.org>
To: Conor Dooley <conor+dt@kernel.org>
To: Alim Akhtar <alim.akhtar@samsung.com>
To: Peter Griffin <peter.griffin@linaro.org>
To: André Draszik <andre.draszik@linaro.org>
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Cc: semen.protsenko@linaro.org
Cc: willmcvicker@google.com
Cc: kernel-team@android.com
Cc: linux-samsung-soc@vger.kernel.org
Cc: linux-crypto@vger.kernel.org
Cc: devicetree@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Tudor Ambarus <tudor.ambarus@linaro.org>

---
Changes in v2:
- dt-bindings: add power-domains. Collect R-b.
- Link to v1: https://lore.kernel.org/r/20251022-gs101-trng-v1-0-8817e2d7a6fc@linaro.org

---
Tudor Ambarus (2):
      dt-bindings: rng: add google,gs101-trng compatible
      arm64: dts: exynos: gs101: add TRNG node

 .../devicetree/bindings/rng/samsung,exynos5250-trng.yaml    | 13 ++++++++++---
 arch/arm64/boot/dts/exynos/google/gs101.dtsi                |  9 +++++++++
 2 files changed, 19 insertions(+), 3 deletions(-)
---
base-commit: 73f7017e663620a616171cc80d62504a624dc4de
change-id: 20251022-gs101-trng-54b710218424

Best regards,
-- 
Tudor Ambarus <tudor.ambarus@linaro.org>

[PATCH v2 1/2] dt-bindings: rng: add google,gs101-trng compatible

[Tudor Ambarus]

Add support for the TRNG found on GS101. It works well with the current
exynos850 TRNG support.

The TRNG controller can be part of a power domain, allow the relevant
property 'power-domains'.

Signed-off-by: Tudor Ambarus <tudor.ambarus@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
---
 .../devicetree/bindings/rng/samsung,exynos5250-trng.yaml    | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/rng/samsung,exynos5250-trng.yaml b/Documentation/devicetree/bindings/rng/samsung,exynos5250-trng.yaml
index 1a71935d8a1906591439c03b7678538e656324b6..b85edb47036ae745b863bd8ded500891ea28c723 100644
--- a/Documentation/devicetree/bindings/rng/samsung,exynos5250-trng.yaml
+++ b/Documentation/devicetree/bindings/rng/samsung,exynos5250-trng.yaml
@@ -12,9 +12,13 @@ maintainers:
 
 properties:
   compatible:
-    enum:
-      - samsung,exynos5250-trng
-      - samsung,exynos850-trng
+    oneOf:
+      - enum:
+          - samsung,exynos5250-trng
+          - samsung,exynos850-trng
+      - items:
+          - const: google,gs101-trng
+          - const: samsung,exynos850-trng
 
   clocks:
     minItems: 1
@@ -27,6 +31,9 @@ properties:
   reg:
     maxItems: 1
 
+  power-domains:
+    maxItems: 1
+
 required:
   - compatible
   - clocks

-- 
2.51.1.851.g4ebd6896fd-goog

[PATCH v2 2/2] arm64: dts: exynos: gs101: add TRNG node

[Tudor Ambarus]

Define the TRNG node. GS101 TRNG works well with the current
Exynos850 TRNG support. Specify the Google specific compatible
in front of the Exynos one.

Signed-off-by: Tudor Ambarus <tudor.ambarus@linaro.org>
---
 arch/arm64/boot/dts/exynos/google/gs101.dtsi | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm64/boot/dts/exynos/google/gs101.dtsi b/arch/arm64/boot/dts/exynos/google/gs101.dtsi
index d06d1d05f36408137a8acd98e43d48ea7d4f4292..380f7e70910ab8bcc28690782532fff87ca7e30b 100644
--- a/arch/arm64/boot/dts/exynos/google/gs101.dtsi
+++ b/arch/arm64/boot/dts/exynos/google/gs101.dtsi
@@ -630,6 +630,15 @@ watchdog_cl1: watchdog@10070000 {
 			status = "disabled";
 		};
 
+		trng: rng@10141400 {
+			compatible = "google,gs101-trng",
+				     "samsung,exynos850-trng";
+			reg = <0x10141400 0x100>;
+			clocks = <&cmu_misc CLK_GOUT_MISC_SSS_I_ACLK>,
+				 <&cmu_misc CLK_GOUT_MISC_SSS_I_PCLK>;
+			clock-names = "secss", "pclk";
+		};
+
 		gic: interrupt-controller@10400000 {
 			compatible = "arm,gic-v3";
 			#address-cells = <0>;

-- 
2.51.1.851.g4ebd6896fd-goog