linux-kernel - Re: [PATCH 1/4] phy: miphy365x: Add Device Tree bindings for the MiPHY365x

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Date:	Thu, 13 Feb 2014 11:03:14 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Mark Rutland <mark.rutland@....com>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"alexandre.torgue@...com" <alexandre.torgue@...com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Srinivas Kandagatla <srinivas.kandagatla@...com>
Subject: Re: [PATCH 1/4] phy: miphy365x: Add Device Tree bindings for the
 MiPHY365x

> > The MiPHY365x is a Generic PHY which can serve various SATA or PCIe
> > devices. It has 2 ports which it can use for either; both SATA, both
> > PCIe or one of each in any configuration.
> > 
> > Cc: devicetree@...r.kernel.org
> > Cc: Srinivas Kandagatla <srinivas.kandagatla@...com>
> > Signed-off-by: Lee Jones <lee.jones@...aro.org>
> > ---
> >  .../devicetree/bindings/phy/phy-miphy365x.txt      | 43 ++++++++++++++++++++++
> >  1 file changed, 43 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/phy/phy-miphy365x.txt
> > 
> > diff --git a/Documentation/devicetree/bindings/phy/phy-miphy365x.txt b/Documentation/devicetree/bindings/phy/phy-miphy365x.txt
> > new file mode 100644
> > index 0000000..fdfa7ca
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/phy/phy-miphy365x.txt
> > @@ -0,0 +1,43 @@
> > +STMicroelectronics STi MIPHY365x PHY binding
> > +============================================
> > +
> > +This binding describes a miphy device that is used to control PHY hardware
> > +for SATA and PCIe.
> > +
> > +Required properties:
> > +- compatible: Should be "st,miphy365x-phy"
> > +- #phy-cells: Should be 2 (See example)
> 
> The first example has #phy-cells = <1>.

Right, will fix. Should be 2.

> What do the cells mean? What are the expected values?

http://www.spinics.net/lists/arm-kernel/msg307209.html

> > +- reg:	      Address and length of the register set for the device
> > +- reg-names:  The names of the register addresses corresponding to the
> > +	      registers filled in "reg".
> 
> Whenever there is a ${PROP}-names property, there should be a list of
> explicit values, and a description of how it relates to ${PROP}. Without
> that it's a bit useless.
> 
> Please provide an explicit list of expected names here.
> 
> I assume here what you want is something like:
> 
> - reg: a list of address + length pairs, one for each entry in reg-names
> - reg-names: should contain:
>   * "sata0" for the sata0 control registers...
>   * "sata1" ...
>   * "pcie0" ...
>   * "pcie1" ...

Can do.

> > +- st,syscfg : Should be a phandle of the syscfg node.
> 
> What's this used for?

It's used to gain access to the system configuration
registers. Specifically in this case the bits to choose between PCI or
SATA mode.

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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