linux-kernel - Re: [PATCH 0/6] soc: Add Baikal-T1 SoC APB/AXI EHB and L2-cache drivers

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Message-ID: <20200401153756.kgjz4wsxsu7mtq4z@ubsrv2.baikal.int>
Date:   Wed, 1 Apr 2020 18:37:56 +0300
From:   Sergey Semin <Sergey.Semin@...kalelectronics.ru>
To:     Arnd Bergmann <arnd@...db.de>
CC:     Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Maxim Kaurkin <Maxim.Kaurkin@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Ramil Zaripov <Ramil.Zaripov@...kalelectronics.ru>,
        Ekaterina Skachko <Ekaterina.Skachko@...kalelectronics.ru>,
        Vadim Vlasov <V.Vlasov@...kalelectronics.ru>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Paul Burton <paulburton@...nel.org>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Olof Johansson <olof@...om.net>, SoC Team <soc@...nel.org>,
        DTML <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/6] soc: Add Baikal-T1 SoC APB/AXI EHB and L2-cache
 drivers

On Thu, Mar 26, 2020 at 03:12:46PM +0100, Arnd Bergmann wrote:
> On Fri, Mar 6, 2020 at 4:19 PM Arnd Bergmann <arnd@...db.de> wrote:
> >
> > On Fri, Mar 6, 2020 at 2:07 PM <Sergey.Semin@...kalelectronics.ru> wrote:
> > >
> > > From: Serge Semin <fancer.lancer@...il.com>
> > >
> > > Aside from PCIe/SATA/DDR/I2C/CPU-reboot specific settings the Baikal-T1
> > > system controller provides three vendor-specific blocks. In particular
> > > there are two Errors Handler Blocks to detect and report an info regarding
> > > any problems discovered on the AXI and APB buses. These are the main buses
> > > utilized by the SoC devices to interact with each other. In addition there
> > > is a way to tune the MIPS P5600 CM2 L2-cache up by setting the Tag/Data/WS
> > > L2-to-RAM latencies. All of this functionality is implemented in the
> > > APB/AXI EHB and L2-cache control block drivers to be a part of the kernel soc
> > > subsystem (as being specific to the Baikal-T1 SoC) and introduced in the
> > > framework of this patchset.
> > >
> > > This patchset is rebased and tested on the mainline Linux kernel 5.6-rc4:
> > > commit 98d54f81e36b ("Linux 5.6-rc4").
> >
> > I have no objection to the drivers, but I wonder if these should be
> > in drivers/bus and drivers/memory instead of drivers/soc, which have
> > similar drivers already. The driver for the L2 cache is not really a
> > memory controller driver, but it may be close enough, and we
> > already have a couple of different things in there.
> 
> I don't see a reply to Rob's or my comments, so I assume you are not currently
> updating them and I will wait for a new version after the v5.7 merge window.
> 
> Dropping the series from patchwork for now, see [1].
> 
>        Arnd
> 
> [1] https://patchwork.kernel.org/project/linux-soc/list/

Yeah, sorry for the delay. I'll send an update very soon. A solution for
the ehb'es is settled. We agreed to move the drivers to the drivers/bus
subsystem. While we still don't know what to do with l2-cache driver.
Please see my last response to your comment on the cover-letter.

Regards,
-Sergey