linux-kernel - RE: [PATCH] [linux][master][v1] devicetree: misc: Add binding for logicoreIP xlnx,vcu

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Date:   Thu, 7 Dec 2017 03:42:38 +0000
From:   Dhaval Rajeshbhai Shah <DSHAH@...inx.com>
To:     'Rob Herring' <robh@...nel.org>
CC:     "mark.rutland@....com" <mark.rutland@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "michal.simek@...inx.com" <michal.simek@...inx.com>,
        Hyun Kwon <hyunk@...inx.com>
Subject: RE: [PATCH] [linux][master][v1] devicetree: misc: Add binding for
 logicoreIP xlnx,vcu



> -----Original Message-----
> From: Rob Herring [mailto:robh@...nel.org]
> Sent: Wednesday, December 06, 2017 1:49 PM
> To: Dhaval Rajeshbhai Shah <DSHAH@...inx.com>
> Cc: mark.rutland@....com; devicetree@...r.kernel.org; linux-
> kernel@...r.kernel.org; michal.simek@...inx.com; Hyun Kwon
> <hyunk@...inx.com>; Dhaval Rajeshbhai Shah <DSHAH@...inx.com>
> Subject: Re: [PATCH] [linux][master][v1] devicetree: misc: Add binding for
> logicoreIP xlnx,vcu
> 
> On Tue, Dec 05, 2017 at 03:07:03AM -0800, Dhaval Shah wrote:
> > From: Dhaval Shah <dhaval.shah@...inx.com>
> >
> > Added the txt file which contain the xlnx,vcu DT node properties
> > information. This also provides the information of it's child node as
> > well.
> >
> > Signed-off-by: Dhaval Shah <dshah@...inx.com>
> > ---
> >  .../devicetree/bindings/misc/xlnx,vcu.txt          | 59
> ++++++++++++++++++++++
> >  1 file changed, 59 insertions(+)
> >  create mode 100644
> > Documentation/devicetree/bindings/misc/xlnx,vcu.txt
> >
> > diff --git a/Documentation/devicetree/bindings/misc/xlnx,vcu.txt
> > b/Documentation/devicetree/bindings/misc/xlnx,vcu.txt
> > new file mode 100644
> > index 0000000..e722ff3
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/misc/xlnx,vcu.txt
> > @@ -0,0 +1,59 @@
> > +Xilinx VCU init Driver
> 
> Bindings don't describe drivers. Describe the h/w.
I will take care of this.
> 
> > +-----------------------------
> > +
> > +General concept
> > +---------------
> > +
> > +Xilinx VCU init driver is developed to handle the LogiCore related
> > +new implementation. In this directory, The DT node of the Xilinx VCU
> > +init driver represents as a top level node.
> > +
> > +Required properties:
> > +- compatible: Must be "xlnx,vcu".
> 
> Needs to be more specific.
I will resolve this.
> 
> > +- reg, reg-names: There are two sets of registers need to provide.
> > +	1. vcu slcr
> > +	2. Logicore
> > +	reg-names should contain name for the each register sequence.
> > +- clocks: phandle for aclk and pll_ref clocksource
> > +- clock-names: The identification string, "aclk", is always required for
> > +   the axi clock. "pll_ref" is required for pll.
> > +- ranges
> > +- VCU Init driver node define the following child nodes:
> > +	* Allegro encoder driver node
> 
> encoder of what?
I have to remove this encoder and decoder nodes. Other team is working on that. They will extend this once they are done with encoder and decoder. 
> 
> > +		- compatible: Must be "al,al5e"
> > +		- reg: There is a one set of register.
> 
> 
> > +		- interrupts: interrupt number to the cpu.
> > +		- interrupt-parent: the phandle for the interrupt controller
> > +		  that services interrupts for this device.
> > +	* Allegro decoder driver node
> > +		- compatible: Must be "al,al5d"
> > +		- reg: There is a one set of register.
> > +		- interrupts: interrupt number to the cpu.
> > +		- interrupt-parent: the phandle for the interrupt controller
> > +		  that services interrupts for this device.
> > +Example:
> > +
> > +	xlnx_vcu: vcu@...40000 {
> > +		compatible = "xlnx,vcu";
> > +		#address-cells = <2>;
> > +		#size-cells = <2>;
> 
> There's no reason the child nodes need 64 bits of address or size. Use ranges.
I will take care of this.
> 
> > +		reg = <0x0 0xa0040000 0x0 0x1000>,
> > +			 <0x0 0xa0041000 0x0 0x1000>;
> > +		reg-names = "vcu_slcr", "logicore";
> > +		clocks = <&si570_1>, <&clkc 71>;
> > +		clock-names = "pll_ref", "aclk";
> > +		ranges;
> > +		encoder: al5e@...00000 {
> > +			compatible = "al,al5e";
> > +			reg = <0x0 0xa0000000 0x0 0x10000>;
> > +			interrupts = <0 89 4>;
> > +			interrupt-parent = <&gic>;
> > +		};
> > +
> > +		decoder: al5d@...20000 {
> > +			compatible = "al,al5d";
> > +			reg = <0x0 0xa0020000 0x0 0x10000>;
> > +			interrupts = <0 89 4>;
> 
> A shared interrupt? Are these really separate blocks? Seems like this could all
> be a single node.
Based on the discussion in the misc/drivers forum, I will remove this encoder and decoder node which is of some other team working on. They will extend this once they are done with there work.
> 
> > +			interrupt-parent = <&gic>;
> > +		};
> > +	};
> > --
> > 2.7.4
> >
> > --
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