linux-kernel - Re: [PATCH v5 3/7] of/address: Introduce of_dma_get_max_cpu

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Date:   Mon, 2 Nov 2020 15:03:42 -0600
From:   Rob Herring <robh+dt@...nel.org>
To:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Christoph Hellwig <hch@....de>,
        Ard Biesheuvel <ardb@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Robin Murphy <robin.murphy@....com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:BROADCOM BCM2835 ARM ARCHITECTURE" 
        <linux-rpi-kernel@...ts.infradead.org>,
        Jeremy Linton <jeremy.linton@....com>,
        Linux IOMMU <iommu@...ts.linux-foundation.org>,
        devicetree@...r.kernel.org, Will Deacon <will@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Hanjun Guo <guohanjun@...wei.com>
Subject: Re: [PATCH v5 3/7] of/address: Introduce of_dma_get_max_cpu_address()

On Thu, Oct 29, 2020 at 12:26 PM Nicolas Saenz Julienne
<nsaenzjulienne@...e.de> wrote:
>
> Introduce of_dma_get_max_cpu_address(), which provides the highest CPU
> physical address addressable by all DMA masters in the system. It's
> specially useful for setting memory zones sizes at early boot time.
>
> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
>
> ---
>
> Changes since v4:
>  - Return max address, not address limit (one-off difference)
>
> Changes since v3:
>  - use u64 with cpu_end
>
> Changes since v2:
>  - Use PHYS_ADDR_MAX
>  - return phys_dma_t
>  - Rename function
>  - Correct subject
>  - Add support to start parsing from an arbitrary device node in order
>    for the function to work with unit tests
>
>  drivers/of/address.c | 42 ++++++++++++++++++++++++++++++++++++++++++
>  include/linux/of.h   |  7 +++++++
>  2 files changed, 49 insertions(+)

Reviewed-by: Rob Herring <robh@...nel.org>