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Date: Thu, 13 Mar 2014 21:37:56 +0800
From: Santosh Shilimkar <santosh.shilimkar@ti.com>
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To: "ABRAHAM, KISHON VIJAY" <kishon@ti.com>, "Balbi, Felipe" <balbi@ti.com>
CC: "Strashko, Grygorii" <grygorii.strashko@ti.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
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        "linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH][next] phy: core: make NULL a valid phy reference if !CONFIG_GENERIC_PHY
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On Thursday 13 March 2014 07:11 PM, Strashko, Grygorii wrote:
> This fixes a regression on Keystone 2 platforms caused by patch
> 57303488cd37da58263e842de134dc65f7c626d5
> "usb: dwc3: adapt dwc3 core to use Generic PHY Framework" which adds
> optional support of generic phy in DWC3 core.
> 
> On Keystone 2 platforms the USB is not working now because
> CONFIG_GENERIC_PHY isn't set and, as result, Generic PHY APIs stubs
> return -ENOSYS always. The log shows:
>  dwc3 2690000.dwc3: failed to initialize core
>  dwc3: probe of 2690000.dwc3 failed with error -38
> 
> Hence, fix it by making NULL a valid phy reference in Generic PHY
> APIs stubs in the same way as it was done by the patch
> 04c2facad8fee66c981a51852806d8923336f362 "drivers: phy: Make NULL
> a valid phy reference".
> 
> CC: Kishon Vijay Abraham I <kishon@ti.com>
> CC: Felipe Balbi <balbi@ti.com>
> CC: Santosh Shilimkar <santosh.shilimkar@ti.com>
> Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
> ---
This fixes the regression seen in Linux next and patch seems
reasonable to me.
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>

Felipe, Kishon,
Can you guys pick this fix if you are ok by it. Thanks


>  include/linux/phy/phy.h |    8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
> index e2f5ca9..5a9b193 100644
> --- a/include/linux/phy/phy.h
> +++ b/include/linux/phy/phy.h
> @@ -204,21 +204,29 @@ static inline void phy_pm_runtime_forbid(struct phy *phy)
>  
>  static inline int phy_init(struct phy *phy)
>  {
> +	if (!phy)
> +		return 0;
>  	return -ENOSYS;
>  }
>  
>  static inline int phy_exit(struct phy *phy)
>  {
> +	if (!phy)
> +		return 0;
>  	return -ENOSYS;
>  }
>  
>  static inline int phy_power_on(struct phy *phy)
>  {
> +	if (!phy)
> +		return 0;
>  	return -ENOSYS;
>  }
>  
>  static inline int phy_power_off(struct phy *phy)
>  {
> +	if (!phy)
> +		return 0;
>  	return -ENOSYS;
>  }
>  
>