linux-kernel - Re: [PATCH 1/6] phy: Add max_bitrate attribute & phy_get_max

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Message-ID: <0c0885c4-f5ae-a29c-7176-f67fe546cfd8@pengutronix.de>
Date:   Mon, 5 Nov 2018 10:37:56 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Faiz Abbas <faiz_abbas@...com>, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, netdev@...r.kernel.org,
        linux-can@...r.kernel.org
Cc:     wg@...ndegger.com, robh+dt@...nel.org, mark.rutland@....com,
        kishon@...com
Subject: Re: [PATCH 1/6] phy: Add max_bitrate attribute &
 phy_get_max_bitrate()

On 11/05/2018 07:27 AM, Faiz Abbas wrote:
> I remove the transceiver child node binding documentation in patch 5/6.
> 
> The existing implementation is pretty limiting as it just has a child
> node with no associated device. What if a transceiver requires its own
> configurations before it can start sending/receiving messages (for
> example, my usecase requires it to pull the standby line low)?
> 
> I think that can be solved by implementing the transceiver as a phy and
> exposing a generic get_max_bitrate API. That way, the transceiver device
> can do all its startup configuration in the phy probe function.
> 
> In any case, do suggest if you have a better idea on how to implement
> pull gpio low requirement.

As long as we don't have any proper transceiver/phy driver, that does
more than swtich on/off a GPIO, please add a "xceiver" regulator to your
driver. Look for:

> devm_regulator_get(&pdev->dev, "xceiver");

in the flexcan driver.

Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
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