linux-kernel - Re: [PATCH 2/8 v4] crypto:s5p-sss: Add device tree support

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Message-ID: <20140123174121.GI15586@e106331-lin.cambridge.arm.com>
Date:	Thu, 23 Jan 2014 17:41:21 +0000
From:	Mark Rutland <mark.rutland@....com>
To:	Sylwester Nawrocki <s.nawrocki@...sung.com>
Cc:	Naveen Krishna Chatradhi <ch.naveen@...sung.com>,
	"linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"vzapolskiy@...il.com" <vzapolskiy@...il.com>,
	"herbert@...dor.apana.org.au" <herbert@...dor.apana.org.au>,
	"naveenkrishna.ch@...il.com" <naveenkrishna.ch@...il.com>,
	"cpgs@...sung.com" <cpgs@...sung.com>,
	"tomasz.figa@...il.com" <tomasz.figa@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	devicetree <devicetree@...r.kernel.org>
Subject: Re: [PATCH 2/8 v4] crypto:s5p-sss: Add device tree support

On Thu, Jan 23, 2014 at 10:28:08AM +0000, Sylwester Nawrocki wrote:
> Hi,
> 
> (Adding missing devicetre ML list at CC.)
> 
> On 15/01/14 10:14, Naveen Krishna Chatradhi wrote:
> > This patch adds device tree support to the s5p-sss.c crypto driver.
> > 
> > Also, Documentation under devicetree/bindings added.
> > 
> > Signed-off-by: Naveen Krishna Ch <ch.naveen@...sung.com>
> > CC: Herbert Xu <herbert@...dor.apana.org.au>
> > CC: David S. Miller <davem@...emloft.net>
> > CC: Vladimir Zapolskiy <vzapolskiy@...il.com>
> > TO: <linux-crypto@...r.kernel.org>
> > CC: <linux-samsung-soc@...r.kernel.org>
> > ---
> > Changes since v3:
> > None
> > 
> >  .../devicetree/bindings/crypto/samsung-sss.txt     |   20 ++++++++++++++++++++
> >  drivers/crypto/s5p-sss.c                           |   10 +++++++++-
> >  2 files changed, 29 insertions(+), 1 deletion(-)
> >  create mode 100644 Documentation/devicetree/bindings/crypto/samsung-sss.txt
> > 
> > diff --git a/Documentation/devicetree/bindings/crypto/samsung-sss.txt b/Documentation/devicetree/bindings/crypto/samsung-sss.txt
> > new file mode 100644
> > index 0000000..2f9d7e4
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/crypto/samsung-sss.txt
> > @@ -0,0 +1,20 @@
> > +Samsung SoC SSS (Security SubSystem) module
> > +
> > +The SSS module in S5PV210 SoC supports the following:
> > +-- Feeder (FeedCtrl)
> > +-- Advanced Encryption Standard (AES)
> > +-- Data Encryption Standard (DES)/3DES
> > +-- Public Key Accelerator (PKA)
> > +-- SHA-1/SHA-256/MD5/HMAC (SHA-1/SHA-256/MD5)/PRNG
> > +-- PRNG: Pseudo Random Number Generator
> > +
> > +Required properties:
> > +
> > +- compatible : Should contain entries for this and backward compatible
> > +  SSS versions:
> > +  - "samsung,s5pv210-secss" for S5PV210 SoC.
> > +- reg : Offset and length of the register set for the module
> > +- interrupts : the interrupt-specifier for the SSS module.
> > +		Two interrupts "feed control and hash" in case of S5PV210
> 
> It should be described in what order both interrupts are supposed to be
> specified.
> 
> > +- clocks : the required gating clock for the SSS module.
> > +- clock-names : the gating clock name to be requested in the SSS driver.

The _exact_ names expected must be described in the binding, or this
property is useless.

> > diff --git a/drivers/crypto/s5p-sss.c b/drivers/crypto/s5p-sss.c
> > index 93cddeb..2da5617 100644
> > --- a/drivers/crypto/s5p-sss.c
> > +++ b/drivers/crypto/s5p-sss.c
> > @@ -22,6 +22,7 @@
> >  #include <linux/scatterlist.h>
> >  #include <linux/dma-mapping.h>
> >  #include <linux/io.h>
> > +#include <linux/of.h>
> >  #include <linux/crypto.h>
> >  #include <linux/interrupt.h>
> >  
> > @@ -177,6 +178,12 @@ struct s5p_aes_dev {
> >  
> >  static struct s5p_aes_dev *s5p_dev;
> >  
> > +static const struct of_device_id s5p_sss_dt_match[] = {
> > +	{ .compatible = "samsung,s5pv210-secss", },
> 
> nit: the first semicolon could be omitted.

I assume you mean comma ratehr than semicolon?

Cheers,
Mark.
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