linux-kernel - Re: [PATCH] phy: ti: gmii-sel: Allow parent to not be syscon node

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Message-ID: <3c7d7d0b-b859-8921-952c-870c9474969c@kernel.org>
Date:   Tue, 16 May 2023 21:33:21 +0300
From:   Roger Quadros <rogerq@...nel.org>
To:     Andrew Davis <afd@...com>, Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Siddharth Vadapalli <s-vadapalli@...com>
Cc:     linux-phy@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] phy: ti: gmii-sel: Allow parent to not be syscon node

Hi Andrew,

On 15/05/2023 22:59, Andrew Davis wrote:
> If the parent node is not a syscon type, then fallback and check
> if we can get a regmap from our own node. This no longer forces
> us to make the parent of this node a syscon node when that might
> not be appropriate.

Trying to understand the motive for this and if it is better to
introduce a "syscon = <&syscon_node>" property instead which
makes it fool proof for all cases.

> 
> Signed-off-by: Andrew Davis <afd@...com>
> ---
>  drivers/phy/ti/phy-gmii-sel.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/phy/ti/phy-gmii-sel.c b/drivers/phy/ti/phy-gmii-sel.c
> index 8c667819c39a..1e67ed9a5cf6 100644
> --- a/drivers/phy/ti/phy-gmii-sel.c
> +++ b/drivers/phy/ti/phy-gmii-sel.c
> @@ -435,9 +435,12 @@ static int phy_gmii_sel_probe(struct platform_device *pdev)
>  
>  	priv->regmap = syscon_node_to_regmap(node->parent);
>  	if (IS_ERR(priv->regmap)) {
> -		ret = PTR_ERR(priv->regmap);
> -		dev_err(dev, "Failed to get syscon %d\n", ret);
> -		return ret;
> +		priv->regmap = device_node_to_regmap(node);
> +		if (IS_ERR(priv->regmap)) {
> +			ret = PTR_ERR(priv->regmap);
> +			dev_err(dev, "Failed to get syscon %d\n", ret);
> +			return ret;
> +		}
>  	}
>  
>  	ret = phy_gmii_sel_init_ports(priv);

-- 
cheers,
-roger