linux-kernel - Re: [PATCH/RFT v2 07/17] ARM: davinci: da8xx: Enable the usb20 "per" clk on phy_clk

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Date:   Tue, 25 Oct 2016 15:42:59 +0530
From:   Sekhar Nori <nsekhar@...com>
To:     <ahaslam@...libre.com>, <gregkh@...uxfoundation.org>,
        <johan@...nel.org>, <robh+dt@...nel.org>,
        <stern@...land.harvard.edu>, <khilman@...libre.com>,
        <sshtylyov@...mvista.com>, <david@...hnology.com>,
        <manjunath.goudar@...aro.org>, <broonie@...nel.org>,
        <abailon@...libre.com>
CC:     <linux-usb@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH/RFT v2 07/17] ARM: davinci: da8xx: Enable the usb20 "per"
 clk on phy_clk_enable

On Monday 24 October 2016 10:16 PM, ahaslam@...libre.com wrote:
> diff --git a/arch/arm/mach-davinci/usb-da8xx.c b/arch/arm/mach-davinci/usb-da8xx.c
> index 9e41a7f..982e105 100644
> --- a/arch/arm/mach-davinci/usb-da8xx.c
> +++ b/arch/arm/mach-davinci/usb-da8xx.c
> @@ -53,11 +53,19 @@ int __init da8xx_register_usb_refclkin(int rate)
>  
>  static void usb20_phy_clk_enable(struct clk *clk)
>  {
> +	struct clk *usb20_clk;
>  	u32 val;
>  	u32 timeout = 500000; /* 500 msec */
>  
>  	val = readl(DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
>  
> +	usb20_clk = clk_get(NULL, "usb20");

We should not be using a NULL device pointer here. Can you pass the musb
device pointer available in the same file? Also, da850_clks[] in da850.c
needs to be fixed to add the matching device name.

> +	if (IS_ERR(usb20_clk)) {
> +		pr_err("could not get usb20 clk\n");
> +		return;
> +	}

Thanks,
Sekhar