linux-kernel - Re: [PATCH] soc: sunxi: Use of_property_present() for testing DT property presence

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Message-ID: <20230313101941.366738a9@slackpad.lan>
Date:   Mon, 13 Mar 2023 10:19:41 +0000
From:   Andre Przywara <andre.przywara@....com>
To:     Rob Herring <robh@...nel.org>
Cc:     Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] soc: sunxi: Use of_property_present() for testing DT
 property presence

On Fri, 10 Mar 2023 08:47:24 -0600
Rob Herring <robh@...nel.org> wrote:

> It is preferred to use typed property access functions (i.e.
> of_property_read_<type> functions) rather than low-level
> of_get_property/of_find_property functions for reading properties. As
> part of this, convert of_get_property/of_find_property calls to the
> recently added of_property_present() helper when we just want to test
> for presence of a property and nothing more.
> 
> Signed-off-by: Rob Herring <robh@...nel.org>

Reviewed-by: Andre Przywara <andre.przywara@....com>

Cheers,
Andre

> ---
>  drivers/soc/sunxi/sunxi_mbus.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/soc/sunxi/sunxi_mbus.c b/drivers/soc/sunxi/sunxi_mbus.c
> index d90e4a264b6f..1734da357ca2 100644
> --- a/drivers/soc/sunxi/sunxi_mbus.c
> +++ b/drivers/soc/sunxi/sunxi_mbus.c
> @@ -82,7 +82,7 @@ static int sunxi_mbus_notifier(struct notifier_block *nb,
>  	 * Older DTs or SoCs who are not clearly understood need to set
>  	 * that DMA offset though.
>  	 */
> -	if (of_find_property(dev->of_node, "interconnects", NULL))
> +	if (of_property_present(dev->of_node, "interconnects"))
>  		return NOTIFY_DONE;
>  
>  	ret = dma_direct_set_offset(dev, PHYS_OFFSET, 0, SZ_4G);