linux-kernel - Re: [PATCH v2 0/6] Add support for Tegra GMI bus controller

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Message-ID: <1472569295.5703.20.camel@toradex.com>
Date:   Tue, 30 Aug 2016 15:01:37 +0000
From:   Marcel Ziswiler <marcel.ziswiler@...adex.com>
To:     "jonathanh@...dia.com" <jonathanh@...dia.com>,
        "mirza.krak@...il.com" <mirza.krak@...il.com>,
        "swarren@...dotorg.org" <swarren@...dotorg.org>,
        "thierry.reding@...il.com" <thierry.reding@...il.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mturquette@...libre.com" <mturquette@...libre.com>,
        "pgaikwad@...dia.com" <pgaikwad@...dia.com>,
        "linux@...linux.org.uk" <linux@...linux.org.uk>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "gnurou@...il.com" <gnurou@...il.com>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "pdeschrijver@...dia.com" <pdeschrijver@...dia.com>,
        "sboyd@...eaurora.org" <sboyd@...eaurora.org>,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>
Subject: Re: [PATCH v2 0/6] Add support for Tegra GMI bus controller

Hi Mirza

Sorry, I long since wanted to give you some feedback on this as well.

BTW: Thank you very much for taking this on!

On Wed, 2016-08-24 at 15:37 +0200, Mirza Krak wrote:
> From: Mirza Krak <mirza.krak@...il.com>
> 
> Hi.
> 
> This is a follow up to my previous RFC to add support for Tegra GMI
> bus
> controller.
> 
> I have tested this series on a Tegra30 using a Colibri T30 SOM on a
> custom
> carrier board which has multiple CAN controllers (SJA1000) connected
> to the
> GMI bus.

We once did a nice GMI-Memory Board which mates with the extension
connector X3 of our V3.x Colibri Evaluation boards and allows testing
SRAM access not only in muxed but also in non-muxed mode albeit 16-bit
only. I took your driver for a spin both on Colibri T20 as well as
Colibri T30 both in muxed as well as non-muxed mode and it passed all
tests being both manual devmem2 type reads/writes as well as memtester
runs on the full 128K SRAM giving it the physical address using the -p
argument.

So you may add the following to the whole series:

Tested-by: Marcel Ziswiler <marcel.ziswiler@...adex.com>
Tested-on: Colibri T20/T30 on EvalBoard V3.x and GMI-Memory Board

I will leave further comments on the individual patches.

BTW: Of course for non-muxed mode I also had to adjust the pin muxing
as they default to muxed.

> I have rebased on top of latest tegra/for-next in V2. Also see
> individual
> patches for changes in V2.
> 
> See below links for previous discussions.
> 
> Comments on RFC:
> https://marc.info/?l=linux-clk&m=146893557629903&w=2
> https://marc.info/?l=linux-tegra&m=146893541829801&w=2
> https://marc.info/?l=linux-tegra&m=146893542429814&w=2
> 
> Comments on V1:
> https://marc.info/?l=linux-arm-kernel&m=147051551821122&w=2
> https://marc.info/?l=linux-arm-kernel&m=147051553121150&w=2
> https://marc.info/?l=linux-arm-kernel&m=147194856600627&w=2
> https://marc.info/?l=linux-arm-kernel&m=147072742432211&w=2
> 
> 
> Mirza Krak (6):
>   clk: tegra: add TEGRA20_CLK_NOR to init table
>   clk: tegra: add TEGRA30_CLK_NOR to init table
>   dt/bindings: Add bindings for Tegra GMI controller
>   ARM: tegra: Add Tegra30 GMI support
>   ARM: tegra: Add Tegra20 GMI support
>   bus: Add support for Tegra Generic Memory Interface
> 
>  .../devicetree/bindings/bus/nvidia,tegra20-gmi.txt | 132
> ++++++++++++
>  arch/arm/boot/dts/tegra20.dtsi                     |  13 ++
>  arch/arm/boot/dts/tegra30.dtsi                     |  12 ++
>  drivers/bus/Kconfig                                |   8 +
>  drivers/bus/Makefile                               |   1 +
>  drivers/bus/tegra-gmi.c                            | 231
> +++++++++++++++++++++
>  drivers/clk/tegra/clk-tegra20.c                    |   1 +
>  drivers/clk/tegra/clk-tegra30.c                    |   1 +
>  8 files changed, 399 insertions(+)
>  create mode 100644
> Documentation/devicetree/bindings/bus/nvidia,tegra20-gmi.txt
>  create mode 100644 drivers/bus/tegra-gmi.c
> 
> --
> 2.1.4
> 
> --
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Cheers

Marcel