linux-kernel - Re: [PATCH 1/6] ARM: dts: rockchip: add basic dtsi file for RK3229 SoC

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Date:   Mon, 19 Jun 2017 14:30:47 +0200
From:   Heiko Stübner <heiko@...ech.de>
To:     Frank Wang <frank.wang@...k-chips.com>
Cc:     robh+dt@...nel.org, ulf.hansson@...aro.org, mark.rutland@....com,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org,
        charles.chen@...k-chips.com, kevan.lan@...k-chips.com,
        huangtao@...k-chips.com, wmc@...k-chips.com
Subject: Re: [PATCH 1/6] ARM: dts: rockchip: add basic dtsi file for RK3229 SoC

Hi Frank,

Am Montag, 19. Juni 2017, 18:34:27 CEST schrieb Frank Wang:
> On 2017/6/18 2:12, Heiko Stuebner wrote:
> > Am Donnerstag, 15. Juni 2017, 15:16:15 CEST schrieb Frank Wang:
> >> Due to some tiny differences between RK3228 and RK3229, this patch
> >> adds a basic dtsi file which includes a new CPU opp table and PSCI
> >> brought up support for RK3229.
> >> 
> >> Signed-off-by: Frank Wang <frank.wang@...k-chips.com>

[...]

> >> +	psci {
> >> +		compatible = "arm,psci-1.0", "arm,psci-0.2";
> >> +		method = "smc";
> >> +	};
> >> +};
> >> +
> >> +&cpu0 {
> >> +	enable-method = "psci";
> >> +};
> > 
> > Hmm, I don't really understand this.
> > What method of core-bringup does the rk3228 use? In the current
> > rk322x.dtsi there is no enable-method at all defined.
> 
> For non-security, the same with rk3036 SoC, we use rk3036-smp method to
> bring-up cores, and for security, we use arm-psci method.
> As security become more and more important and required, we would prefer
> using arm-psci method, and it is also an easy way to use.
> 
> > So is the rk3228 firmware using a different method than the rk3229?
> 
> No, they are the same. How about I move these changes to rk322x.dtsi?

yep, that is what I was getting at with my question ;-)


> > And out of curiosity as this is a arm32 without atf, is the psci
> > implementation (for uboot?) you're using available somewhere?
> 
> Ah, it is included in op-tee :-)

Is that super secret or will this be part of the official op-tee [0]
at some point (Similar to the ATF stuff on arm64)?


Heiko

[0] https://github.com/OP-TEE/optee_os/tree/master/core/arch/arm