linux-kernel - Re: [net-next v3 3/9] net: ethernet: cortina: Convert to devm_clk_get

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Message-ID: <20240827115349.00002f77@Huawei.com>
Date: Tue, 27 Aug 2024 11:53:49 +0100
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: Yangtao Li <frank.li@...o.com>
CC: <clement.leger@...tlin.com>, <andrew@...n.ch>, <f.fainelli@...il.com>,
	<olteanv@...il.com>, <davem@...emloft.net>, <edumazet@...gle.com>,
	<kuba@...nel.org>, <pabeni@...hat.com>, <ulli.kroll@...glemail.com>,
	<linus.walleij@...aro.org>, <marcin.s.wojtas@...il.com>,
	<linux@...linux.org.uk>, <alexandre.torgue@...s.st.com>,
	<joabreu@...opsys.com>, <mcoquelin.stm32@...il.com>, <hkallweit1@...il.com>,
	<u.kleine-koenig@...gutronix.de>, <jacob.e.keller@...el.com>,
	<justinstitt@...gle.com>, <sd@...asysnail.net>, <horms@...nel.org>,
	<linux-renesas-soc@...r.kernel.org>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-stm32@...md-mailman.stormreply.com>, Maxime Chevallier
	<maxime.chevallier@...tlin.com>
Subject: Re: [net-next v3 3/9] net: ethernet: cortina: Convert to
 devm_clk_get_enabled()

On Tue, 27 Aug 2024 03:57:06 -0600
Yangtao Li <frank.li@...o.com> wrote:

> Convert devm_clk_get(), clk_prepare_enable() to a single
> call to devm_clk_get_enabled(), as this is exactly
> what this function does.
> 
> Signed-off-by: Yangtao Li <frank.li@...o.com>
> Reviewed-by: Maxime Chevallier <maxime.chevallier@...tlin.com>
> Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

I don't like the mixing of devm and non devm here.
Maybe better to use a devm_add_action_or_reset()
for geth_cleanup_freeq() as well.


> ---
> v3:
> -move the local clock variables, keep lines longest to shortest
> 
>  drivers/net/ethernet/cortina/gemini.c | 25 ++++++++-----------------
>  1 file changed, 8 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/net/ethernet/cortina/gemini.c b/drivers/net/ethernet/cortina/gemini.c
> index 73e1c71c5092..5c86987c6fdf 100644
> --- a/drivers/net/ethernet/cortina/gemini.c
> +++ b/drivers/net/ethernet/cortina/gemini.c
> @@ -109,7 +109,6 @@ struct gemini_ethernet_port {
>  	struct device *dev;
>  	void __iomem *dma_base;
>  	void __iomem *gmac_base;
> -	struct clk *pclk;
>  	struct reset_control *reset;
>  	int irq;
>  	__le32 mac_addr[3];
> @@ -2326,7 +2325,6 @@ static void gemini_port_remove(struct gemini_ethernet_port *port)
>  		phy_disconnect(port->netdev->phydev);
>  		unregister_netdev(port->netdev);
>  	}
> -	clk_disable_unprepare(port->pclk);
>  	geth_cleanup_freeq(port->geth);
>  }
>  
> @@ -2401,6 +2399,7 @@ static int gemini_ethernet_port_probe(struct platform_device *pdev)
>  	struct gemini_ethernet *geth;
>  	struct net_device *netdev;
>  	struct device *parent;
> +	struct clk *pclk;
>  	u8 mac[ETH_ALEN];
>  	unsigned int id;
>  	int irq;
> @@ -2453,14 +2452,11 @@ static int gemini_ethernet_port_probe(struct platform_device *pdev)
>  	port->irq = irq;
>  
>  	/* Clock the port */
> -	port->pclk = devm_clk_get(dev, "PCLK");
> -	if (IS_ERR(port->pclk)) {
> +	pclk = devm_clk_get_enabled(dev, "PCLK");
> +	if (IS_ERR(pclk)) {
>  		dev_err(dev, "no PCLK\n");
> -		return PTR_ERR(port->pclk);
> +		return PTR_ERR(pclk);
>  	}
> -	ret = clk_prepare_enable(port->pclk);
> -	if (ret)
> -		return ret;
>  
>  	/* Maybe there is a nice ethernet address we should use */
>  	gemini_port_save_mac_addr(port);
> @@ -2469,8 +2465,7 @@ static int gemini_ethernet_port_probe(struct platform_device *pdev)
>  	port->reset = devm_reset_control_get_exclusive(dev, NULL);
>  	if (IS_ERR(port->reset)) {
>  		dev_err(dev, "no reset\n");
> -		ret = PTR_ERR(port->reset);
> -		goto unprepare;
> +		return PTR_ERR(port->reset);
>  	}
>  	reset_control_reset(port->reset);
>  	usleep_range(100, 500);
> @@ -2532,24 +2527,20 @@ static int gemini_ethernet_port_probe(struct platform_device *pdev)
>  					port_names[port->id],
>  					port);
>  	if (ret)
> -		goto unprepare;
> +		return ret;
>  
>  	ret = gmac_setup_phy(netdev);
>  	if (ret) {
>  		netdev_err(netdev,
>  			   "PHY init failed\n");
> -		goto unprepare;
> +		return ret;
>  	}
>  
>  	ret = register_netdev(netdev);
>  	if (ret)
> -		goto unprepare;
> +		return ret;
>  
>  	return 0;
> -
> -unprepare:
> -	clk_disable_unprepare(port->pclk);
> -	return ret;
>  }
>  
>  static void gemini_ethernet_port_remove(struct platform_device *pdev)