linux-kernel - Re: [PATCH v5 01/25] PM / devfreq: rockchip-dfi: Make pmu regmap mandatory

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Date:   Tue, 13 Jun 2023 18:21:22 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.com>
To:     Sascha Hauer <s.hauer@...gutronix.de>
Cc:     linux-rockchip@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, Heiko Stuebner <heiko@...ech.de>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>, kernel@...gutronix.de,
        Michael Riesch <michael.riesch@...fvision.net>,
        Robin Murphy <robin.murphy@....com>,
        Vincent Legoll <vincent.legoll@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, devicetree@...r.kernel.org
Subject: Re: [PATCH v5 01/25] PM / devfreq: rockchip-dfi: Make pmu regmap
 mandatory

Hi,

On Wed, May 24, 2023 at 10:31:29AM +0200, Sascha Hauer wrote:
> As a matter of fact the regmap_pmu already is mandatory because
> it is used unconditionally in the driver. Bail out gracefully in
> probe() rather than crashing later.
> 
> Fixes: b9d1262bca0af ("PM / devfreq: event: support rockchip dfi controller")
> Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
> ---

Reviewed-by: Sebastian Reichel <sebastian.reichel@...labora.com>

-- Sebastian

> 
> Notes:
>     Changes since v4:
>     - move to beginning of the series to make it easier to backport to stable
>     - Add a Fixes: tag
>     - add missing of_node_put()
> 
>  drivers/devfreq/event/rockchip-dfi.c | 15 ++++++++-------
>  1 file changed, 8 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/devfreq/event/rockchip-dfi.c b/drivers/devfreq/event/rockchip-dfi.c
> index 39ac069cabc75..74893c06aa087 100644
> --- a/drivers/devfreq/event/rockchip-dfi.c
> +++ b/drivers/devfreq/event/rockchip-dfi.c
> @@ -193,14 +193,15 @@ static int rockchip_dfi_probe(struct platform_device *pdev)
>  		return dev_err_probe(dev, PTR_ERR(data->clk),
>  				     "Cannot get the clk pclk_ddr_mon\n");
>  
> -	/* try to find the optional reference to the pmu syscon */
>  	node = of_parse_phandle(np, "rockchip,pmu", 0);
> -	if (node) {
> -		data->regmap_pmu = syscon_node_to_regmap(node);
> -		of_node_put(node);
> -		if (IS_ERR(data->regmap_pmu))
> -			return PTR_ERR(data->regmap_pmu);
> -	}
> +	if (!node)
> +		return dev_err_probe(&pdev->dev, -ENODEV, "Can't find pmu_grf registers\n");
> +
> +	data->regmap_pmu = syscon_node_to_regmap(node);
> +	of_node_put(node);
> +	if (IS_ERR(data->regmap_pmu))
> +		return PTR_ERR(data->regmap_pmu);
> +
>  	data->dev = dev;
>  
>  	desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
> -- 
> 2.39.2
> 

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