netdev - Re: [PATCH 07/54] dt-bindings: bluetooth: broadcom: Fix clocks check

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Date:   Fri, 23 Jul 2021 15:38:43 -0600
From:   Rob Herring <robh@...nel.org>
To:     Maxime Ripard <maxime@...no.tech>
Cc:     Frank Rowand <frowand.list@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        devicetree@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org,
        Jakub Kicinski <kuba@...nel.org>, linux-sunxi@...glegroups.com
Subject: Re: [PATCH 07/54] dt-bindings: bluetooth: broadcom: Fix clocks check

On Wed, 21 Jul 2021 16:03:37 +0200, Maxime Ripard wrote:
> The original binding was mentioning that valid values for the clocks and
> clock-names property were one or two clocks from extclk, txco and lpo,
> with extclk being deprecated in favor of txco.
> 
> However, the current binding lists a valid array as extclk, txco and
> lpo, with either one or two items.
> 
> While this looks similar, it actually enforces that all the device trees
> use either ["extclk"], or ["extclk", "txco"]. That doesn't make much
> sense, since the two clocks are said to be equivalent, with one
> superseeding the other.
> 
> lpo is also not a valid clock anymore, and would be as the third clock
> of the list, while we could have only this clock in the previous binding
> (and in DTs).
> 
> Let's rework the clock clause to allow to have either:
> 
>  - extclk, and mark it a deprecated
>  - txco alone
>  - lpo alone
>  - txco, lpo
> 
> While ["extclk", "lpo"] wouldn't be valid, it wasn't found in any device
> tree so it's not an issue in practice.
> 
> Similarly, ["lpo", "txco"] is still considered invalid, but it's
> generally considered as a best practice to fix the order of clocks.
> 
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Jakub Kicinski <kuba@...nel.org>
> Cc: Linus Walleij <linus.walleij@...aro.org>
> Cc: netdev@...r.kernel.org
> Signed-off-by: Maxime Ripard <maxime@...no.tech>
> ---
>  .../bindings/net/broadcom-bluetooth.yaml        | 17 +++++++++++++++--
>  1 file changed, 15 insertions(+), 2 deletions(-)
> 

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