linux-kernel - Re: [PATCH v11 0/9] Add Sunplus SP7021 SoC Support

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Message-ID: <YjmrdlQqoqUNcs7R@bogus>
Date:   Tue, 22 Mar 2022 10:56:54 +0000
From:   Sudeep Holla <sudeep.holla@....com>
To:     Qin Jian <qinjian@...lus1.com>
Cc:     krzysztof.kozlowski@...onical.com, robh+dt@...nel.org,
        mturquette@...libre.com, sboyd@...nel.org, tglx@...utronix.de,
        maz@...nel.org, p.zabel@...gutronix.de, linux@...linux.org.uk,
        arnd@...db.de, linux-arm-kernel@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Sudeep Holla <sudeep.holla@....com>, linux-clk@...r.kernel.org
Subject: Re: [PATCH v11 0/9] Add Sunplus SP7021 SoC Support

On Tue, Mar 22, 2022 at 02:16:51PM +0800, Qin Jian wrote:
> This patch series add Sunplus SP7021 SoC support.
> 
> Sunplus SP7021 is an ARM Cortex A7 (4 cores) based SoC. It integrates many
> peripherals (ex: UART, I2C, SPI, SDIO, eMMC, USB, SD card and etc.) into a
> single chip. It is designed for industrial control.
> 
> SP7021 consists of two chips (dies) in a package. One is called C-chip
> (computing chip). It is a 4-core ARM Cortex A7 CPU. It adopts high-level
> process (22 nm) for high performance computing. The other is called P-
> chip (peripheral chip). It has many peripherals and an ARM A926 added
> especially for real-time control. P-chip is made for customers. It adopts
> low-level process (ex: 0.11 um) to reduce cost.

Not related to this series, but to the platform in general. You still
need to resolved the boot/cpu-method for this platform before you add
support for all the 4 cpus on this platform. I remember discussing about
CPUIdle on a separate thread. I thought this is best thread to remind that
so that it is addressed before we see either cpuidle or cpuhotplug support
on this platform.

-- 
Regards,
Sudeep