netdev - Re: [PATCH v3 0/2] MCAN: Add support for implementing transceiver as a phy

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Message-ID: <2ac62e0b-58e0-0a5c-06c9-c2d5052c7a5d@ti.com>
Date:   Mon, 10 May 2021 11:01:22 +0530
From:   Aswath Govindraju <a-govindraju@...com>
To:     unlisted-recipients:; (no To-header on input)
CC:     <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-can@...r.kernel.org>, <netdev@...r.kernel.org>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        Rob Herring <robh+dt@...nel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Chandrasekar Ramakrishnan <rcsekar@...sung.com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Lokesh Vutla <lokeshvutla@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Faiz Abbas <faiz_abbas@...com>
Subject: Re: [PATCH v3 0/2] MCAN: Add support for implementing transceiver as
 a phy

Hi all,

On 16/04/21 5:12 pm, Aswath Govindraju wrote:
> The following series of patches add support for implementing the
> transceiver as a phy of m_can_platform driver.
> 
> TCAN1042 has a standby signal that needs to be pulled high for
> sending/receiving messages[1]. TCAN1043 has a enable signal along with
> standby signal that needs to be pulled up for sending/receiving
> messages[2], and other combinations of the two lines can be used to put the
> transceiver in different states to reduce power consumption. On boards
> like the AM654-idk and J721e-evm these signals are controlled using gpios.
> 
> These gpios are set in phy driver, and the transceiver can be put in
> different states using phy API. The phy driver is added in the series [3].
> 
> This patch series is dependent on [4].
> 
> changes since v2:
> - changed dev_err to dev_err_probe in patch 2
> - used mcan_class instead of priv to assign max bit rate
> - Picked up  Rob Herring's acked-by for patch 1
> 
> changes since v1:
> - Used the API devm_phy_get_optional() instead of 
>   devm_of_phy_get_optional_by_index()
> > [1] - https://www.ti.com/lit/ds/symlink/tcan1042h.pdf
> [2] - https://www.ti.com/lit/ds/symlink/tcan1043-q1.pdf
> [3] - https://lore.kernel.org/patchwork/project/lkml/list/?series=495511
> [4] - https://lore.kernel.org/patchwork/patch/1413286/
> 

Posted v4 for this series after adding phy_power_off in the path when
there is an error.

Thanks,
Aswath

> Faiz Abbas (2):
>   dt-bindings: net: can: Document transceiver implementation as phy
>   can: m_can: Add support for transceiver as phy
> 
>  .../devicetree/bindings/net/can/bosch,m_can.yaml    |  3 +++
>  drivers/net/can/m_can/m_can.c                       | 10 ++++++++++
>  drivers/net/can/m_can/m_can.h                       |  2 ++
>  drivers/net/can/m_can/m_can_platform.c              | 13 +++++++++++++
>  4 files changed, 28 insertions(+)
>