linux-kernel - Re: [PATCH v6 01/10] i3c: Add core I3C infrastructure

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Date:   Mon, 3 Sep 2018 10:33:11 +0100
From:   vitor <Vitor.Soares@...opsys.com>
To:     Przemyslaw Gaj <pgaj@...ence.com>,
        vitor <Vitor.Soares@...opsys.com>,
        Boris Brezillon <boris.brezillon@...tlin.com>
CC:     "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        Sekhar Nori <nsekhar@...com>, Wolfram Sang <wsa@...-dreams.de>,
        "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
        Jonathan Corbet <corbet@....net>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Przemyslaw Sroka <psroka@...ence.com>,
        Arkadiusz Golec <agolec@...ence.com>,
        Alan Douglas <adouglas@...ence.com>,
        Bartosz Folta <bfolta@...ence.com>,
        Damian Kos <dkos@...ence.com>,
        Alicja Jurasik-Urbaniak <alicja@...ence.com>,
        Cyprian Wronka <cwronka@...ence.com>,
        Suresh Punnoose <sureshp@...ence.com>,
        Rafal Ciepiela <rafalc@...ence.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Nishanth Menon <nm@...com>, Rob Herring <robh+dt@...nel.org>,
        Pawel Moll <pawel.moll@....com>,
        Mark Rutland <mark.rutland@....com>,
        Ian Campbell <ijc+devicetree@...lion.org.uk>,
        "Kumar Gala" <galak@...eaurora.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Xiang Lin <Xiang.Lin@...aptics.com>,
        Peter Rosin <peda@...ntia.se>
Subject: Re: [PATCH v6 01/10] i3c: Add core I3C infrastructure

Hi Przemek,


On 30-08-2018 20:00, Przemyslaw Gaj wrote:
>      So, per my understanding since the Main master support the hand-off of
>      the bus you accept all incoming MR, right? Or do you check all devices BCR?
>
> I'm not sure what do you mean here. Mastership request(MR) is from secondary master
> to current master. Current master can NACK this request if for example it comes from
> wrong device. If it's ok, current master sends GETACCMST command and secondary master
> may ACK or NACK this command. It it's acked, secondary master becomes current master.
>      
>      Best regards,
>      Vitor Soares
>
> Please let me know if something is unclear.
>
> Regards,
> Przemek
>      

Sorry, it s not clear yet.

For instances there is a bus with several secondary master. If each of 
them request the bus mastership (one at a time), will you accept all by 
default? Because you can only accept only some of them.

Regards,
Vitor Soares