diff mbox series

[v3,2/3] dt-bindings: rng: update bindings for MediaTek ARMv8 SoCs

Message ID 1560162984-26104-3-git-send-email-neal.liu@mediatek.com (mailing list archive)
State New, archived
Headers show
Series MediaTek Security random number generator support | expand

Commit Message

Neal Liu June 10, 2019, 10:36 a.m. UTC
Document the binding used by the MediaTek ARMv8 SoCs random
number generator with TrustZone enabled.

Signed-off-by: Neal Liu <neal.liu@mediatek.com>
---
 Documentation/devicetree/bindings/rng/mtk-rng.txt |   15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

Comments

Rob Herring (Arm) June 11, 2019, 10:53 p.m. UTC | #1
On Mon, Jun 10, 2019 at 06:36:23PM +0800, Neal Liu wrote:
> Document the binding used by the MediaTek ARMv8 SoCs random
> number generator with TrustZone enabled.
> 
> Signed-off-by: Neal Liu <neal.liu@mediatek.com>
> ---
>  Documentation/devicetree/bindings/rng/mtk-rng.txt |   15 ++++++++++++---
>  1 file changed, 12 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/rng/mtk-rng.txt b/Documentation/devicetree/bindings/rng/mtk-rng.txt
> index 2bc89f1..fb3dd59 100644
> --- a/Documentation/devicetree/bindings/rng/mtk-rng.txt
> +++ b/Documentation/devicetree/bindings/rng/mtk-rng.txt
> @@ -3,9 +3,13 @@ found in MediaTek SoC family
>  
>  Required properties:
>  - compatible	    : Should be
> -			"mediatek,mt7622-rng", 	"mediatek,mt7623-rng" : for MT7622
> -			"mediatek,mt7629-rng",  "mediatek,mt7623-rng" : for MT7629
> -			"mediatek,mt7623-rng" : for MT7623
> +			"mediatek,mt7622-rng", "mediatek,mt7623-rng" for MT7622
> +			"mediatek,mt7629-rng", "mediatek,mt7623-rng" for MT7629
> +			"mediatek,mt7623-rng" for MT7623
> +			"mediatek,mtk-sec-rng" for MediaTek ARMv8 SoCs with
> +			security RNG

Is there any commonality with the prior h/w? If not, make this a 
separate binding doc.

> +
> +Optional properties:
>  - clocks	    : list of clock specifiers, corresponding to
>  		      entries in clock-names property;
>  - clock-names	    : Should contain "rng" entries;
> @@ -19,3 +23,8 @@ rng: rng@1020f000 {
>  	clocks = <&infracfg CLK_INFRA_TRNG>;
>  	clock-names = "rng";
>  };
> +
> +/* secure RNG */
> +hwrng: hwrng {
> +	compatible = "mediatek,mtk-sec-rng";

How does one access this? Seems like this should be part of a node for 
firmware? What about other functions?

> +};
> -- 
> 1.7.9.5
>
Neal Liu June 12, 2019, 4:02 a.m. UTC | #2
On Tue, 2019-06-11 at 16:53 -0600, Rob Herring wrote:
> On Mon, Jun 10, 2019 at 06:36:23PM +0800, Neal Liu wrote:
> > Document the binding used by the MediaTek ARMv8 SoCs random
> > number generator with TrustZone enabled.
> > 
> > Signed-off-by: Neal Liu <neal.liu@mediatek.com>
> > ---
> >  Documentation/devicetree/bindings/rng/mtk-rng.txt |   15 ++++++++++++---
> >  1 file changed, 12 insertions(+), 3 deletions(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/rng/mtk-rng.txt b/Documentation/devicetree/bindings/rng/mtk-rng.txt
> > index 2bc89f1..fb3dd59 100644
> > --- a/Documentation/devicetree/bindings/rng/mtk-rng.txt
> > +++ b/Documentation/devicetree/bindings/rng/mtk-rng.txt
> > @@ -3,9 +3,13 @@ found in MediaTek SoC family
> >  
> >  Required properties:
> >  - compatible	    : Should be
> > -			"mediatek,mt7622-rng", 	"mediatek,mt7623-rng" : for MT7622
> > -			"mediatek,mt7629-rng",  "mediatek,mt7623-rng" : for MT7629
> > -			"mediatek,mt7623-rng" : for MT7623
> > +			"mediatek,mt7622-rng", "mediatek,mt7623-rng" for MT7622
> > +			"mediatek,mt7629-rng", "mediatek,mt7623-rng" for MT7629
> > +			"mediatek,mt7623-rng" for MT7623
> > +			"mediatek,mtk-sec-rng" for MediaTek ARMv8 SoCs with
> > +			security RNG
> 
> Is there any commonality with the prior h/w? If not, make this a 
> separate binding doc.

There are less common with the prior h/w... I had been thinking about
make new binding doc. Since your suggestion, I'll make one.

> 
> > +
> > +Optional properties:
> >  - clocks	    : list of clock specifiers, corresponding to
> >  		      entries in clock-names property;
> >  - clock-names	    : Should contain "rng" entries;
> > @@ -19,3 +23,8 @@ rng: rng@1020f000 {
> >  	clocks = <&infracfg CLK_INFRA_TRNG>;
> >  	clock-names = "rng";
> >  };
> > +
> > +/* secure RNG */
> > +hwrng: hwrng {
> > +	compatible = "mediatek,mtk-sec-rng";
> 
> How does one access this? Seems like this should be part of a node for 
> firmware? What about other functions?

Yes, We move all hw register & clock control access to the ATF by smc.

> 
> > +};
> > -- 
> > 1.7.9.5
> >
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/rng/mtk-rng.txt b/Documentation/devicetree/bindings/rng/mtk-rng.txt
index 2bc89f1..fb3dd59 100644
--- a/Documentation/devicetree/bindings/rng/mtk-rng.txt
+++ b/Documentation/devicetree/bindings/rng/mtk-rng.txt
@@ -3,9 +3,13 @@  found in MediaTek SoC family
 
 Required properties:
 - compatible	    : Should be
-			"mediatek,mt7622-rng", 	"mediatek,mt7623-rng" : for MT7622
-			"mediatek,mt7629-rng",  "mediatek,mt7623-rng" : for MT7629
-			"mediatek,mt7623-rng" : for MT7623
+			"mediatek,mt7622-rng", "mediatek,mt7623-rng" for MT7622
+			"mediatek,mt7629-rng", "mediatek,mt7623-rng" for MT7629
+			"mediatek,mt7623-rng" for MT7623
+			"mediatek,mtk-sec-rng" for MediaTek ARMv8 SoCs with
+			security RNG
+
+Optional properties:
 - clocks	    : list of clock specifiers, corresponding to
 		      entries in clock-names property;
 - clock-names	    : Should contain "rng" entries;
@@ -19,3 +23,8 @@  rng: rng@1020f000 {
 	clocks = <&infracfg CLK_INFRA_TRNG>;
 	clock-names = "rng";
 };
+
+/* secure RNG */
+hwrng: hwrng {
+	compatible = "mediatek,mtk-sec-rng";
+};