linux-kernel - Re: [PATCH] reset: ti-rstctrl: use the reset-simple driver

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Date:   Fri, 19 Jan 2018 16:55:51 -0800
From:   Tony Lindgren <tony@...mide.com>
To:     Suman Anna <s-anna@...com>
Cc:     Philipp Zabel <p.zabel@...gutronix.de>,
        Philipp Zabel <philipp.zabel@...il.com>,
        Paul Parsons <lost.distance@...oo.com>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-omap@...r.kernel.org, Dave Gerlach <d-gerlach@...com>,
        Mark Rutland <mark.rutland@....com>, Nishant Menon <nm@...com>,
        Rob Herring <robh+dt@...nel.org>, Tero Kristo <t-kristo@...com>
Subject: Re: [PATCH] reset: ti-rstctrl: use the reset-simple driver

* Suman Anna <s-anna@...com> [180120 00:43]:
> On 01/19/2018 05:49 PM, Tony Lindgren wrote:
> > * Suman Anna <s-anna@...com> [180119 23:30]:
> >> On 01/19/2018 03:33 PM, Tony Lindgren wrote:
> >>> OK let's do some tests on that, I'll take a look at doing a dts
> >>> file over next few weeks.
> >>
> >> You can look up the patches folder in the above repo, there are some
> >> example nodes there already, they are rather straight-forward.
> > 
> > Just for reference, here's what I played with but keep getting
> > -EPROBE_DEFER somewhere during init.
> 
> Hmm, What's the baseline branch you are using - mainline, linux-next or
> your for-next?

I just quickly tested with Linux next + my yet to be posted patches..
I'll debug it further.

> > 	prm: prm@...0 {
> > 		...
> > 		ranges = <0 0x6000 0x3000>;
> > 
> > 		prm_dsp: prm@400 {
> > 			compatible = "simple-bus";
> > 			#address-cells = <1>;
> > 			#size-cells = <1>;
> > 			ranges = <0 0x400 0x100>;
> > 
> > 			dsp_rstctrl: rstctrl@10 {
> > 				compatible = "ti,rstctrl";
> > 				reg = <0x10 0x4>;
> > 				#reset-cells = <1>;
> > 			};
> > 		};
> > 		...
> > 	};
> > 
> > 	target-module@...66000 {
> > 		compatible = "ti,sysc-omap2", "ti,sysc";
> > 		ti,hwmods = "mmu_dsp";
> > 		reg = <0x4a066000 0x4>,
> > 		      <0x4a066010 0x4>,
> > 		      <0x4a066014 0x4>;
> > 		reg-names = "rev", "sysc", "syss";
> > 		ti,sysc-mask = <(SYSC_OMAP2_CLOCKACTIVITY |
> > 				 SYSC_OMAP2_SOFTRESET |
> > 				 SYSC_OMAP2_AUTOIDLE)>;
> > 		ti,sysc-sidle = <SYSC_IDLE_FORCE>,
> > 				<SYSC_IDLE_NO>,
> > 				<SYSC_IDLE_SMART>;
> > 		clocks = <&tesla_clkctrl OMAP4_DSP_CLKCTRL 0>;
> > 		clock-names = "fck";
> > 		resets = <&dsp_rstctrl 1>,
> > 			 <&dsp_rstctrl 0>;
> > 		reset-names = "rst2", "rst1";
> 
> We definitely do not want the two resets here for sure, as the rst2
> belongs to the dsp core (I believe it would be a sibling node to mmu_dsp
> here), and cannot be released from reset without programming the MMU and
> loading the code.

OK thanks, I'll give that a try next week at some point.

Regards,

Tony