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Message-ID: <1554027049.21644.0.camel@mtkswgap22>
Subject: Re: [PATCH] PCI: mediatek: get optional clock by
 devm_clk_get_optional()
From:   Ryder Lee <ryder.lee@mediatek.com>
To:     Chunfeng Yun <chunfeng.yun@mediatek.com>
CC:     Honghui Zhang <honghui.zhang@mediatek.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
        Bjorn Helgaas <bhelgaas@google.com>,
        "Matthias Brugger" <matthias.bgg@gmail.com>,
        <linux-pci@vger.kernel.org>, <linux-mediatek@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>
Date:   Sun, 31 Mar 2019 18:10:49 +0800
In-Reply-To: <1553940051-10367-1-git-send-email-chunfeng.yun@mediatek.com>
References: <1553940051-10367-1-git-send-email-chunfeng.yun@mediatek.com>
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Sender: linux-kernel-owner@vger.kernel.org
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On Sat, 2019-03-30 at 18:00 +0800, Chunfeng Yun wrote:
> Use devm_clk_get_optional() to get optional clock
> 
> Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
> ---
>  drivers/pci/controller/pcie-mediatek.c | 46 ++++++--------------------
>  1 file changed, 11 insertions(+), 35 deletions(-)
> 
> diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c
> index 0b6c72804e03..9a66a018489b 100644
> --- a/drivers/pci/controller/pcie-mediatek.c
> +++ b/drivers/pci/controller/pcie-mediatek.c
> @@ -915,49 +915,25 @@ static int mtk_pcie_parse_port(struct mtk_pcie *pcie,
>  
>  	/* sys_ck might be divided into the following parts in some chips */
>  	snprintf(name, sizeof(name), "ahb_ck%d", slot);
> -	port->ahb_ck = devm_clk_get(dev, name);
> -	if (IS_ERR(port->ahb_ck)) {
> -		if (PTR_ERR(port->ahb_ck) == -EPROBE_DEFER)
> -			return -EPROBE_DEFER;
> -
> -		port->ahb_ck = NULL;
> -	}
> +	port->ahb_ck = devm_clk_get_optional(dev, name);
> +	if (IS_ERR(port->ahb_ck))
> +		return PTR_ERR(port->ahb_ck);
>  
>  	snprintf(name, sizeof(name), "axi_ck%d", slot);
> -	port->axi_ck = devm_clk_get(dev, name);
> -	if (IS_ERR(port->axi_ck)) {
> -		if (PTR_ERR(port->axi_ck) == -EPROBE_DEFER)
> -			return -EPROBE_DEFER;
> -
> -		port->axi_ck = NULL;
> -	}
> +	port->axi_ck = devm_clk_get_optional(dev, name);
> +		return PTR_ERR(port->axi_ck);
>  
>  	snprintf(name, sizeof(name), "aux_ck%d", slot);
> -	port->aux_ck = devm_clk_get(dev, name);
> -	if (IS_ERR(port->aux_ck)) {
> -		if (PTR_ERR(port->aux_ck) == -EPROBE_DEFER)
> -			return -EPROBE_DEFER;
> -
> -		port->aux_ck = NULL;
> -	}
> +	port->aux_ck = devm_clk_get_optional(dev, name);
> +		return PTR_ERR(port->aux_ck);
>  
>  	snprintf(name, sizeof(name), "obff_ck%d", slot);
> -	port->obff_ck = devm_clk_get(dev, name);
> -	if (IS_ERR(port->obff_ck)) {
> -		if (PTR_ERR(port->obff_ck) == -EPROBE_DEFER)
> -			return -EPROBE_DEFER;
> -
> -		port->obff_ck = NULL;
> -	}
> +	port->obff_ck = devm_clk_get_optional(dev, name);
> +		return PTR_ERR(port->obff_ck);
>  
>  	snprintf(name, sizeof(name), "pipe_ck%d", slot);
> -	port->pipe_ck = devm_clk_get(dev, name);
> -	if (IS_ERR(port->pipe_ck)) {
> -		if (PTR_ERR(port->pipe_ck) == -EPROBE_DEFER)
> -			return -EPROBE_DEFER;
> -
> -		port->pipe_ck = NULL;
> -	}
> +	port->pipe_ck = devm_clk_get_optional(dev, name);
> +		return PTR_ERR(port->pipe_ck);
>  
>  	snprintf(name, sizeof(name), "pcie-rst%d", slot);
>  	port->reset = devm_reset_control_get_optional_exclusive(dev, name);

if (IS_ERR(...)) ?