linux-kernel - Re: [PATCH 02/25] dt-bindings: net: dwmac: Extend number of PBL values

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Message-ID: <20201215171455.GA4047592@robh.at.kernel.org>
Date:   Tue, 15 Dec 2020 11:14:55 -0600
From:   Rob Herring <robh@...nel.org>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc:     netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        "David S. Miller" <davem@...emloft.net>,
        linux-kernel@...r.kernel.org, Jose Abreu <joabreu@...opsys.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Serge Semin <fancer.lancer@...il.com>,
        devicetree@...r.kernel.org,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Vyacheslav Mitrofanov 
        <Vyacheslav.Mitrofanov@...kalelectronics.ru>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Joao Pinto <jpinto@...opsys.com>,
        Lars Persson <larper@...s.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        linux-stm32@...md-mailman.stormreply.com,
        Johan Hovold <johan@...nel.org>,
        Maxime Ripard <mripard@...nel.org>
Subject: Re: [PATCH 02/25] dt-bindings: net: dwmac: Extend number of PBL
 values

On Mon, 14 Dec 2020 12:15:52 +0300, Serge Semin wrote:
> In accordance with [1] the permitted PBL values can be set as one of
> [1, 2, 4, 8, 16, 32]. The rest of the values results in undefined
> behavior. At the same time some of the permitted values can be also
> invalid depending on the controller FIFOs size and the data bus width.
> Seeing due to having too many variables all the possible PBL property
> constraints can't be implemented in the bindings schema, let's extend
> the set of permitted PBL values to be as much as the configuration
> register supports leaving the undefined behaviour cases for developers
> to handle.
> 
> [1] DesignWare Cores Ethernet MAC Universal Databook, Revision 3.73a,
>     October 2013, p. 380.
> 
> Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> ---
>  Documentation/devicetree/bindings/net/snps,dwmac.yaml | 11 +++++++----
>  1 file changed, 7 insertions(+), 4 deletions(-)
> 

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