linux-kernel - Re: [PATCH v3 03/25] firmware: rpi: Only create clocks device if we don't have a node for it

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Date:   Thu, 04 Jun 2020 19:50:42 +0200
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     Maxime Ripard <maxime@...no.tech>
Cc:     Tim Gover <tim.gover@...pberrypi.com>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        linux-kernel@...r.kernel.org,
        bcm-kernel-feedback-list@...adcom.com,
        linux-rpi-kernel@...ts.infradead.org,
        Phil Elwell <phil@...pberrypi.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 03/25] firmware: rpi: Only create clocks device if we
 don't have a node for it

On Wed, 2020-05-27 at 17:44 +0200, Maxime Ripard wrote:
> The firmware clocks driver was previously probed through a platform_device
> created by the firmware driver.
> 
> Since we will now have a node for that clocks driver, we need to create the
> device only in the case where there's no node for it already.
> 
> Signed-off-by: Maxime Ripard <maxime@...no.tech>
> ---

Reviewed-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>

Regards,
Nicolas

>  drivers/firmware/raspberrypi.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/drivers/firmware/raspberrypi.c b/drivers/firmware/raspberrypi.c
> index ef8098856a47..b25901a77c09 100644
> --- a/drivers/firmware/raspberrypi.c
> +++ b/drivers/firmware/raspberrypi.c
> @@ -208,6 +208,20 @@ rpi_register_hwmon_driver(struct device *dev, struct
> rpi_firmware *fw)
>  
>  static void rpi_register_clk_driver(struct device *dev)
>  {
> +	struct device_node *firmware;
> +
> +	/*
> +	 * Earlier DTs don't have a node for the firmware clocks but
> +	 * rely on us creating a platform device by hand. If we do
> +	 * have a node for the firmware clocks, just bail out here.
> +	 */
> +	firmware = of_get_compatible_child(dev->of_node,
> +					   "raspberrypi,firmware-clocks");
> +	if (firmware) {
> +		of_node_put(firmware);
> +		return;
> +	}
> +
>  	rpi_clk = platform_device_register_data(dev, "raspberrypi-clk",
>  						-1, NULL, 0);
>  }


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