linux-kernel - [PATCH v1] memory: mediatek: add DRAM controller driver

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Date:   Tue, 30 Mar 2021 13:22:07 +0800
From:   Po-Kai Chi <pk.chi@...iatek.com>
To:     Matthias Brugger <matthias.bgg@...il.com>
CC:     <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <wsd_upstream@...iatek.com>, CC Hwang <cc.hwang@...iatek.com>,
        Loda Chou <loda.chou@...iatek.com>,
        Po-Kai Chi <pk.chi@...iatek.com>
Subject: [PATCH v1] memory: mediatek: add DRAM controller driver

These patch series introduces the MediaTek DRAM controller driver (DRAMC)
on MT6779 SoC, and enables to be built as a module by default for the
ARM64 builds.

MediaTek DRAMC driver provides cross-platform features as below:
  - API provided to other kernel modules for querying DRAM type,
    rank count, rank size, channel count and mode register settings.
  - Sysfs interface used to pass DRAM mode register settings and current
    DRAM data rate to user-space for MediaTek ecosystem.

The API user includes MediaTek External Memory Interface (EMI) and
DVFS Resource Control (DVFSRC), which will be sent to mainline later.