linux-kernel - Re: [PATCH 1/2] reset: img: Add pistachio reset controller binding document

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Date:	Fri, 15 Jan 2016 16:32:35 +0000
From:	James Hartley <james.hartley@...tec.com>
To:	Philipp Zabel <p.zabel@...gutronix.de>
CC:	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Damien Horsley <damien.horsley@...tec.com>,
	Govindraj Raja <govindraj.raja@...tec.com>
Subject: Re: [PATCH 1/2] reset: img: Add pistachio reset controller binding
 document

Hi Philipp,

Thanks for the quick review,

On 01/15/16 15:57, Philipp Zabel wrote:
> Am Freitag, den 15.01.2016, 14:44 +0000 schrieb James Hartley:
[..]
>> +Example:
>> +
>> +	pistachio_reset: reset-controller {
>> +		compatible = "img,pistachio-reset";
>> +		img,cr-periph = <&cr_periph>;
>> +		#reset-cells = <1>;
>> +	};
> If this is just a register in the cr_periph syscon, why not put the
> reset-controller node inside the cr_periph node:
>
>      cr_periph: syscon@xyz {
>          compatible = "syscon", "simple-mfd";
>          pistachio_reset: reset-controller {
>              compatible = "img,pistachio-reset";
>              #reset-cells = <1>;
>          };
>      };
>
> And in the driver use
>      syscon_node_to_regmap(np->parent);
> instead of
>      syscon_regmap_lookup_by_phandle(np, "img,cr-periph");
> ?

Yes that makes sense, I'll look at changing that for a V2 patchset.

> Do you need a reg property, or is will the register offset be 0 in all
> pistachio variants?

The offset will always be 0 for all pistachio variants.

[..]
> +Example:
> +
> +	spdif_out: spdif-out@...00d00 {
> +		...
> +		resets = <&pistachio_reset PISTACHIO_RESET_SPDIF_OUT>;
> +		reset-names = "rst";
> reset-names is not needed for devices that only have one reset.

Agreed, but there are already audio drivers that pistachio uses that 
have been merged upstream
using this name in their dt-entries - is there any harm in leaving it in?

>
> regards
> Philipp
>
Thanks,
James.