linux-kernel - Re: [PATCH v7 17/23] dt-bindings: crypto: meson: remove clk and second interrupt line for GXL

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Date: Thu, 23 May 2024 10:46:35 +0000
From: Alexey Romanov <avromanov@...utedevices.com>
To: Conor Dooley <conor@...nel.org>
CC: "neil.armstrong@...aro.org" <neil.armstrong@...aro.org>,
	"clabbe@...libre.com" <clabbe@...libre.com>, "herbert@...dor.apana.org.au"
	<herbert@...dor.apana.org.au>, "davem@...emloft.net" <davem@...emloft.net>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	"krzysztof.kozlowski+dt@...aro.org" <krzysztof.kozlowski+dt@...aro.org>,
	"conor+dt@...nel.org" <conor+dt@...nel.org>, "khilman@...libre.com"
	<khilman@...libre.com>, "jbrunet@...libre.com" <jbrunet@...libre.com>,
	"martin.blumenstingl@...glemail.com" <martin.blumenstingl@...glemail.com>,
	"vadim.fedorenko@...ux.dev" <vadim.fedorenko@...ux.dev>,
	"linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
	"linux-amlogic@...ts.infradead.org" <linux-amlogic@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, kernel <kernel@...rdevices.ru>
Subject: Re: [PATCH v7 17/23] dt-bindings: crypto: meson: remove clk and
 second interrupt line for GXL

Hi Conor,

On Mon, May 06, 2024 at 04:47:29PM +0100, Conor Dooley wrote:
> On Mon, May 06, 2024 at 01:48:01PM +0000, Alexey Romanov wrote:
> > On Mon, Apr 15, 2024 at 05:43:15PM +0100, Conor Dooley wrote:
> > > On Thu, Apr 11, 2024 at 04:38:26PM +0300, Alexey Romanov wrote:
> > > > GXL crypto IP isn't connected to clk and seconnd interrput line,
> > > > so we must remove them from dt-bindings.
> > > 
> > > How does the device work without a clock?
> > 
> > It's clocked by a common clock, the vendor didn't provide more
> > information. It doesn't have any special clock domains.
> 
> So the hardware block does have a clock, which, even if it is a clock
> shared with other hardware blocks, makes your patch incorrect.
> 
> Is the "blkmv" clock the shared clock?

I received accurate information from the vendor. Starting from GXL,
DMA engine is used for crypto HW and clock is hard weired to it (at RTL
level). That's why we have to remove it from device tree, because we can't
control it anyway.

I will add clarification about this in commit message in text patch
series.


> 
> Cheers,
> Conor.
> 
> > > > Fixes: 7f7d115dfb51 ("dt-bindings: crypto: Add DT bindings
> > > > documentation for amlogic-crypto")
> > > > 
> > > > Signed-off-by: Alexey Romanov <avromanov@...utedevices.com>
> > > > ---
> > > >  .../bindings/crypto/amlogic,gxl-crypto.yaml         | 13 +------------
> > > >  1 file changed, 1 insertion(+), 12 deletions(-)
> > > > 
> > > > diff --git a/Documentation/devicetree/bindings/crypto/amlogic,gxl-crypto.yaml b/Documentation/devicetree/bindings/crypto/amlogic,gxl-crypto.yaml
> > > > index 948e11ebe4ee..d3af7b4d5f39 100644
> > > > --- a/Documentation/devicetree/bindings/crypto/amlogic,gxl-crypto.yaml
> > > > +++ b/Documentation/devicetree/bindings/crypto/amlogic,gxl-crypto.yaml
> > > > @@ -20,20 +20,11 @@ properties:
> > > >    interrupts:
> > > >      items:
> > > >        - description: Interrupt for flow 0
> > > > -      - description: Interrupt for flow 1
> > > > -
> > > > -  clocks:
> > > > -    maxItems: 1
> > > > -
> > > > -  clock-names:
> > > > -    const: blkmv
> > > >  
> > > >  required:
> > > >    - compatible
> > > >    - reg
> > > >    - interrupts
> > > > -  - clocks
> > > > -  - clock-names
> > > >  
> > > >  additionalProperties: false
> > > >  
> > > > @@ -46,7 +37,5 @@ examples:
> > > >      crypto: crypto-engine@...3e000 {
> > > >          compatible = "amlogic,gxl-crypto";
> > > >          reg = <0xc883e000 0x36>;
> > > > -        interrupts = <GIC_SPI 188 IRQ_TYPE_EDGE_RISING>, <GIC_SPI 189 IRQ_TYPE_EDGE_RISING>;
> > > > -        clocks = <&clkc CLKID_BLKMV>;
> > > > -        clock-names = "blkmv";
> > > > +        interrupts = <GIC_SPI 188 IRQ_TYPE_EDGE_RISING>;
> > > >      };
> > > > -- 
> > > > 2.34.1
> > > > 
> > 
> > 
> > 
> > 
> > -- 
> > Thank you,
> > Alexey



-- 
Thank you,
Alexey