linux-kernel - Re: [PATCH v1 2/2] crypto: mediatek

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Date:   Thu, 8 Dec 2016 17:19:36 +0800
From:   Ryder Lee <ryder.lee@...iatek.com>
To:     Matthias Brugger <matthias.bgg@...il.com>
CC:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        <devicetree@...r.kernel.org>, <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-crypto@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        "Sean Wang" <sean.wang@...iatek.com>,
        Roy Luo <cheng-hao.luo@...iatek.com>
Subject: Re: [PATCH v1 2/2] crypto: mediatek - add DT bindings documentation

Hello,

On Mon, 2016-12-05 at 11:18 +0100, Matthias Brugger wrote:
> 
> On 05/12/16 08:01, Ryder Lee wrote:
> > Add DT bindings documentation for the crypto driver
> >
> > Signed-off-by: Ryder Lee <ryder.lee@...iatek.com>
> > ---
> >  .../devicetree/bindings/crypto/mediatek-crypto.txt | 32 ++++++++++++++++++++++
> >  1 file changed, 32 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/crypto/mediatek-crypto.txt
> >
> > diff --git a/Documentation/devicetree/bindings/crypto/mediatek-crypto.txt b/Documentation/devicetree/bindings/crypto/mediatek-crypto.txt
> > new file mode 100644
> > index 0000000..8b1db08
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/crypto/mediatek-crypto.txt
> > @@ -0,0 +1,32 @@
> > +MediaTek cryptographic accelerators
> > +
> > +Required properties:
> > +- compatible: Should be "mediatek,mt7623-crypto"
> 
> Do you know how big the difference is between the crypto engine for 
> mt7623/mt2701/mt8521p in comparison, let's say mt8173 or mt6797?
> Do this SoCs have a crypot engine? If so and they are quite similar, we 
> might think of adding a mtk-crypto binding and add soc specific bindings.

This engine is just available in mt7623/mt2701/mt8521p series SoCs and
they have no difference.

But there are still other crypto IPs in MTK, i think maybe we could use
"mediatek,{IP name}-crypto” to distinguish them ?

> Regards,
> Matthias
> 
> > +- reg: Address and length of the register set for the device
> > +- interrupts: Should contain the five crypto engines interrupts in numeric
> > +	order. These are global system and four descriptor rings.
> > +- clocks: the clock used by the core
> > +- clock-names: the names of the clock listed in the clocks property. These are
> > +	"ethif", "cryp"
> > +- power-domains: Must contain a reference to the PM domain.
> > +
> > +
> > +Optional properties:
> > +- interrupt-parent: Should be the phandle for the interrupt controller
> > +  that services interrupts for this device
> > +
> > +
> > +Example:
> > +	crypto: crypto@...40000 {
> > +		compatible = "mediatek,mt7623-crypto";
> > +		reg = <0 0x1b240000 0 0x20000>;
> > +		interrupts = <GIC_SPI 82 IRQ_TYPE_LEVEL_LOW>,
> > +			     <GIC_SPI 83 IRQ_TYPE_LEVEL_LOW>,
> > +			     <GIC_SPI 84 IRQ_TYPE_LEVEL_LOW>,
> > +			     <GIC_SPI 91 IRQ_TYPE_LEVEL_LOW>,
> > +			     <GIC_SPI 97 IRQ_TYPE_LEVEL_LOW>;
> > +		clocks = <&topckgen CLK_TOP_ETHIF_SEL>,
> > +			 <&ethsys CLK_ETHSYS_CRYPTO>;
> > +		clock-names = "ethif","cryp";
> > +		power-domains = <&scpsys MT2701_POWER_DOMAIN_ETH>;
> > +	};
> >