linux-kernel - Re: [PATCH] arm64: dts: realtek: Add Realtek rtd1619 and mjolnir

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Message-ID: <279fd3a3-17dc-5796-f0b0-e39eb919081f@suse.de>
Date:   Fri, 15 Nov 2019 02:08:32 +0100
From:   Andreas Färber <afaerber@...e.de>
To:     James Tai <james.tai@...ltek.com>
Cc:     "linux-realtek-soc@...ts.infradead.org" 
        <linux-realtek-soc@...ts.infradead.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH] arm64: dts: realtek: Add Realtek rtd1619 and mjolnir

Hi James,

Am 11.11.19 um 03:58 schrieb James Tai:
>> How much? More than 0x98000000? The RTD1395 datasheet says up to 4 GB -
>> does that mean it continues in a second region beyond 0xffffffff? Those
>> locations should be excluded in the soc node ranges (which you sadly appear to
>> have dropped in v2).
> 
> Sorry for my misunderstanding. The RAM region don't require 
> two cells for memory nodes, so I'll fix it in v3 patch.

Should I then also change RTD1395 to use only one cell, or does it
support more RAM than RTD1619?

By my calculation 0x98000000 is less than 2.4 GiB! So, does RAM continue
between r-bus and GIC, similar to how it does on RTD1195? Then we need
to exclude those RAM ranges from the SoC node (adjusting 0x68000000).

Regards,
Andreas

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