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Date:   Fri, 15 Oct 2021 10:30:42 +0300
From:   Dan Carpenter <>
To:     Mwesigwa Guma <>
        Nicolas Saenz Julienne <>,
        Greg Kroah-Hartman <>,
        Stefan Wahren <>,
        Ojaswin Mujoo <>,
        Amarjargal Gundjalam <>,
        Phil Elwell <>,,,,,,
        Joel Savitz <>,
        Chukpozohn Toe <>,
        Clark Williams <>
Subject: Re: [PATCH] staging: vchiq_arm: Add 36-bit address support

On Thu, Oct 14, 2021 at 06:32:30PM -0400, Mwesigwa Guma wrote:
> Cc: Nicolas Saenz Julienne <>
> Cc: Greg Kroah-Hartman <>
> Cc: Stefan Wahren <>
> Cc: Ojaswin Mujoo <>
> Cc: Dan Carpenter <>
> Cc: Amarjargal Gundjalam <>
> Cc: Phil Elwell <>
> Cc:
> Cc: 
> Cc: 
> Cc: 
> Cc:
> Cc: Joel Savitz <>
> Cc: Chukpozohn Toe <>
> Cc: Clark Williams <>

Did you intend to put this CC list here?  It goes at the end next to
the Signed-off-by line if so.  I don't feel like it's required except
maybe Phil to show he was Cc'd.

> This is a forward port of Phil Elwell's commit from the Raspberry Pi
> Linux fork described as follows [1]:

Please use the From: header to give authorship credit.

From: Phil Elwell <>

Make that the first line of the email.

>     Conditional on a new compatible string, change the pagelist encoding
>     such that the top 24 bits are the pfn, leaving 8 bits for run length
>     (-1), giving a 36-bit address range.
>     Manage the split between addresses for the VPU and addresses for the
>     40-bit DMA controller with a dedicated DMA device pointer that on non-
>     BCM2711 platforms is the same as the main VCHIQ device. This allows
>     the VCHIQ node to stay in the usual place in the DT.
> This commit enables VCHIQ device access on a Raspberry Pi 4B running the 
> mainline Linux kernel.
> Tested on Fedora Linux running on a Raspberry Pi 4B.
> [1]:
> Signed-off-by: Mwesigwa Guma <>

dan carpenter

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