linux-kernel - Re: [PATCH v4 2/4] mailbox: imx: support return value of init

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Date: Thu, 25 Jan 2024 08:32:17 +0100
From: Sascha Hauer <s.hauer@...gutronix.de>
To: "Peng Fan (OSS)" <peng.fan@....nxp.com>
Cc: Jassi Brar <jassisinghbrar@...il.com>, Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Dong Aisheng <aisheng.dong@....com>,
	Shawn Guo <shawnguo@...nel.org>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	NXP Linux Team <linux-imx@....com>, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Peng Fan <peng.fan@....com>
Subject: Re: [PATCH v4 2/4] mailbox: imx: support return value of init

On Thu, Jan 25, 2024 at 01:20:04PM +0800, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@....com>
> 
> There will be changes that init may fail, so adding return value for
> init function.
> 
> Signed-off-by: Peng Fan <peng.fan@....com>

Reviewed-by: Sascha Hauer <s.hauer@...gutronix.de>

Sascha

> ---
>  drivers/mailbox/imx-mailbox.c | 35 ++++++++++++++++++++++++-----------
>  1 file changed, 24 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/mailbox/imx-mailbox.c b/drivers/mailbox/imx-mailbox.c
> index 656171362fe9..dced4614065f 100644
> --- a/drivers/mailbox/imx-mailbox.c
> +++ b/drivers/mailbox/imx-mailbox.c
> @@ -110,7 +110,7 @@ struct imx_mu_dcfg {
>  	int (*tx)(struct imx_mu_priv *priv, struct imx_mu_con_priv *cp, void *data);
>  	int (*rx)(struct imx_mu_priv *priv, struct imx_mu_con_priv *cp);
>  	int (*rxdb)(struct imx_mu_priv *priv, struct imx_mu_con_priv *cp);
> -	void (*init)(struct imx_mu_priv *priv);
> +	int (*init)(struct imx_mu_priv *priv);
>  	enum imx_mu_type type;
>  	u32	xTR;		/* Transmit Register0 */
>  	u32	xRR;		/* Receive Register0 */
> @@ -737,7 +737,7 @@ static struct mbox_chan *imx_mu_seco_xlate(struct mbox_controller *mbox,
>  	return imx_mu_xlate(mbox, sp);
>  }
>  
> -static void imx_mu_init_generic(struct imx_mu_priv *priv)
> +static int imx_mu_init_generic(struct imx_mu_priv *priv)
>  {
>  	unsigned int i;
>  	unsigned int val;
> @@ -757,7 +757,7 @@ static void imx_mu_init_generic(struct imx_mu_priv *priv)
>  	priv->mbox.of_xlate = imx_mu_xlate;
>  
>  	if (priv->side_b)
> -		return;
> +		return 0;
>  
>  	/* Set default MU configuration */
>  	for (i = 0; i < IMX_MU_xCR_MAX; i++)
> @@ -770,9 +770,11 @@ static void imx_mu_init_generic(struct imx_mu_priv *priv)
>  	/* Clear any pending RSR */
>  	for (i = 0; i < IMX_MU_NUM_RR; i++)
>  		imx_mu_read(priv, priv->dcfg->xRR + (i % 4) * 4);
> +
> +	return 0;
>  }
>  
> -static void imx_mu_init_specific(struct imx_mu_priv *priv)
> +static int imx_mu_init_specific(struct imx_mu_priv *priv)
>  {
>  	unsigned int i;
>  	int num_chans = priv->dcfg->type & IMX_MU_V2_S4 ? IMX_MU_S4_CHANS : IMX_MU_SCU_CHANS;
> @@ -794,12 +796,20 @@ static void imx_mu_init_specific(struct imx_mu_priv *priv)
>  	/* Set default MU configuration */
>  	for (i = 0; i < IMX_MU_xCR_MAX; i++)
>  		imx_mu_write(priv, 0, priv->dcfg->xCR[i]);
> +
> +	return 0;
>  }
>  
> -static void imx_mu_init_seco(struct imx_mu_priv *priv)
> +static int imx_mu_init_seco(struct imx_mu_priv *priv)
>  {
> -	imx_mu_init_generic(priv);
> +	int ret;
> +
> +	ret = imx_mu_init_generic(priv);
> +	if (ret)
> +		return ret;
>  	priv->mbox.of_xlate = imx_mu_seco_xlate;
> +
> +	return 0;
>  }
>  
>  static int imx_mu_probe(struct platform_device *pdev)
> @@ -866,7 +876,11 @@ static int imx_mu_probe(struct platform_device *pdev)
>  
>  	priv->side_b = of_property_read_bool(np, "fsl,mu-side-b");
>  
> -	priv->dcfg->init(priv);
> +	ret = priv->dcfg->init(priv);
> +	if (ret) {
> +		dev_err(dev, "Failed to init MU\n");
> +		goto disable_clk;
> +	}
>  
>  	spin_lock_init(&priv->xcr_lock);
>  
> @@ -878,10 +892,8 @@ static int imx_mu_probe(struct platform_device *pdev)
>  	platform_set_drvdata(pdev, priv);
>  
>  	ret = devm_mbox_controller_register(dev, &priv->mbox);
> -	if (ret) {
> -		clk_disable_unprepare(priv->clk);
> -		return ret;
> -	}
> +	if (ret)
> +		goto disable_clk;
>  
>  	pm_runtime_enable(dev);
>  
> @@ -899,6 +911,7 @@ static int imx_mu_probe(struct platform_device *pdev)
>  
>  disable_runtime_pm:
>  	pm_runtime_disable(dev);
> +disable_clk:
>  	clk_disable_unprepare(priv->clk);
>  	return ret;
>  }
> 
> -- 
> 2.37.1
> 
> 
> 

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