linux-kernel - Re: [PATCH 1/5] can: xilinx_can: defer the probe if clock is not found

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Date:   Mon, 12 Aug 2019 11:03:02 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Appana Durga Kedareswara rao <appana.durga.rao@...inx.com>,
        wg@...ndegger.com, davem@...emloft.net, michal.simek@...inx.com
Cc:     linux-can@...r.kernel.org, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Venkatesh Yadav Abbarapu <venkatesh.abbarapu@...inx.com>
Subject: Re: [PATCH 1/5] can: xilinx_can: defer the probe if clock is not
 found

On 8/12/19 9:28 AM, Appana Durga Kedareswara rao wrote:
> From: Venkatesh Yadav Abbarapu <venkatesh.abbarapu@...inx.com>
> 
> It's not always the case that clock is already available when can
> driver get probed at the first time, e.g. the clock is provided by
> clock wizard which may be probed after can driver. So let's defer
> the probe when devm_clk_get() call fails and give it chance to
> try later.

Technically the patch changes the error message to not being printed in
case of EPROBE_DEFER. This patch doesn't change any behaviour apart from
that. Please adjust the patch description accordingly.

Marc

> 
> Signed-off-by: Venkatesh Yadav Abbarapu <venkatesh.abbarapu@...inx.com>
> Signed-off-by: Michal Simek <michal.simek@...inx.com>
> ---
>  drivers/net/can/xilinx_can.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/can/xilinx_can.c b/drivers/net/can/xilinx_can.c
> index bd95cfa..ac175ab 100644
> --- a/drivers/net/can/xilinx_can.c
> +++ b/drivers/net/can/xilinx_can.c
> @@ -1791,7 +1791,8 @@ static int xcan_probe(struct platform_device *pdev)
>  	/* Getting the CAN can_clk info */
>  	priv->can_clk = devm_clk_get(&pdev->dev, "can_clk");
>  	if (IS_ERR(priv->can_clk)) {
> -		dev_err(&pdev->dev, "Device clock not found.\n");
> +		if (PTR_ERR(priv->can_clk) != -EPROBE_DEFER)
> +			dev_err(&pdev->dev, "Device clock not found.\n");
>  		ret = PTR_ERR(priv->can_clk);
>  		goto err_free;
>  	}
> 


-- 
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