On Tue, 2019-07-23 at 08:35 -0600, Rob Herring wrote:

On Mon, Jul 22, 2019 at 8:21 PM Neal Liu [off-list ref] wrote:

quoted

Please don't top post to lists.

quoted

Dear Rob,
        You can check my driver for detail:
        http://patchwork.kernel.org/patch/11012475/ or patchset 3/3

I could, or you could just answer my question.

quoted

        This driver is registered as hardware random number generator, and
combines with rng-core.
        We want to add one rng hw based on the dts. Is this proper or do you
have other suggestion to meet this requirement?

It depends. There doesn't appear to be any resource configuration, so
why does it need to be in DT. DT is not the only way instantiate
drivers.

Rob

This hwrng is only supported on some chipsets. It needs DT to identify
which platform is supported or not. Is there any better idea to meet
this requirement?

Neal

quoted

        Thanks


On Tue, 2019-07-23 at 01:13 +0800, Rob Herring wrote:

quoted

On Mon, Jun 24, 2019 at 03:24:11PM +0800, Neal Liu wrote:

quoted

Document the binding used by the MediaTek ARMv8 SoCs random
number generator with TrustZone enabled.

Signed-off-by: Neal Liu <redacted>
---
 .../devicetree/bindings/rng/mtk-sec-rng.txt        |   10 ++++++++++
 1 file changed, 10 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/rng/mtk-sec-rng.txt

diff --git a/Documentation/devicetree/bindings/rng/mtk-sec-rng.txt b/Documentation/devicetree/bindings/rng/mtk-sec-rng.txt
new file mode 100644
index 0000000..c04ce15
--- /dev/null
+++ b/Documentation/devicetree/bindings/rng/mtk-sec-rng.txt

@@ -0,0 +1,10 @@
+MediaTek random number generator with TrustZone enabled
+
+Required properties:
+- compatible : Should be "mediatek,mtk-sec-rng"

What's the interface to access this?

A node with a 'compatible' and nothing else is a sign of something that
a parent device should instantiate and doesn't need to be in DT. IOW,
what do complete bindings for firmware functions look like?

quoted

+
+Example:
+
+hwrng: hwrng {
+   compatible = "mediatek,mtk-sec-rng";
+}
--
1.7.9.5

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