linux-kernel - Re: [PATCH v5 1/2] dmaengine: mxs: use platform_driver

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Date:   Wed, 13 Jul 2022 10:40:36 +0200
From:   Marco Felsch <m.felsch@...gutronix.de>
To:     Dario Binacchi <dario.binacchi@...rulasolutions.com>
Cc:     linux-kernel@...r.kernel.org,
        Michael Trimarchi <michael@...rulasolutions.com>,
        linux-amarula@...rulasolutions.com,
        Sascha Hauer <s.hauer@...gutronix.de>, stable@...r.kernel.org,
        Vinod Koul <vkoul@...nel.org>,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        dmaengine@...r.kernel.org, Shawn Guo <shawnguo@...nel.org>,
        Fabio Estevam <festevam@...il.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v5 1/2] dmaengine: mxs: use platform_driver_register

Hi Dario,

On 22-07-12, Dario Binacchi wrote:
> Driver registration fails on SOC imx8mn as its supplier, the clock
> control module, is probed later than subsys initcall level. This driver
> uses platform_driver_probe which is not compatible with deferred probing
> and won't be probed again later if probe function fails due to clock not
> being available at that time.
> 
> This patch replaces the use of platform_driver_probe with
> platform_driver_register which will allow probing the driver later again
> when the clock control module will be available.
> 
> Fixes: a580b8c5429a ("dmaengine: mxs-dma: add dma support for i.MX23/28")
> Co-developed-by: Michael Trimarchi <michael@...rulasolutions.com>
> Signed-off-by: Michael Trimarchi <michael@...rulasolutions.com>
> Signed-off-by: Dario Binacchi <dario.binacchi@...rulasolutions.com>
> Cc: stable@...r.kernel.org
> 
> ---
> 
> Changes in v5:
> - Update the commit message.
> - Create a new patch to remove the warning generated by this patch.

Please squash this new patch into this patch since you introduce the
warning with this patch.

Regards,
  Marco

> Changes in v4:
> - Restore __init in front of mxs_dma_probe() definition.
> - Rename the mxs_dma_driver variable to mxs_dma_driver_probe.
> - Update the commit message.
> - Use builtin_platform_driver() instead of module_platform_driver().
> 
> Changes in v3:
> - Restore __init in front of mxs_dma_init() definition.
> 
> Changes in v2:
> - Add the tag "Cc: stable@...r.kernel.org" in the sign-off area.
> 
>  drivers/dma/mxs-dma.c | 8 ++------
>  1 file changed, 2 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/dma/mxs-dma.c b/drivers/dma/mxs-dma.c
> index 994fc4d2aca4..18f8154b859b 100644
> --- a/drivers/dma/mxs-dma.c
> +++ b/drivers/dma/mxs-dma.c
> @@ -839,10 +839,6 @@ static struct platform_driver mxs_dma_driver = {
>  		.name	= "mxs-dma",
>  		.of_match_table = mxs_dma_dt_ids,
>  	},
> +	.probe = mxs_dma_probe,
>  };
> -
> -static int __init mxs_dma_module_init(void)
> -{
> -	return platform_driver_probe(&mxs_dma_driver, mxs_dma_probe);
> -}
> -subsys_initcall(mxs_dma_module_init);
> +builtin_platform_driver(mxs_dma_driver);
> -- 
> 2.32.0
> 
> 
>