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Date: Wed, 24 Jun 2015 16:51:09 +0530
From: Kishon Vijay Abraham I <kishon@ti.com>
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To: Tony Lindgren <tony@atomide.com>
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Subject: Re: [PATCH 17/17] ARM: dts: omap4: Use "syscon-otghs" instead of
 "ctrl-module" in USB node
References: <1435060743-5511-1-git-send-email-kishon@ti.com> <1435060743-5511-18-git-send-email-kishon@ti.com> <20150624104116.GC4156@atomide.com>
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Hi Tony,

On Wednesday 24 June 2015 04:11 PM, Tony Lindgren wrote:
> * Kishon Vijay Abraham I <kishon@ti.com> [150623 05:02]:
>> --- a/arch/arm/boot/dts/omap4.dtsi
>> +++ b/arch/arm/boot/dts/omap4.dtsi
>> @@ -852,12 +852,6 @@
>>   			};
>>   		};
>>
>> -		omap_control_usbotg: control-phy@4a00233c {
>> -			compatible = "ti,control-phy-otghs";
>> -			reg = <0x4a00233c 0x4>;
>> -			reg-names = "otghs_control";
>> -		};
>> -
>>   		usb_otg_hs: usb_otg_hs@4a0ab000 {
>>   			compatible = "ti,omap4-musb";
>>   			reg = <0x4a0ab000 0x7ff>;
>> @@ -870,7 +864,7 @@
>>   			multipoint = <1>;
>>   			num-eps = <16>;
>>   			ram-bits = <12>;
>> -			ctrl-module = <&omap_control_usbotg>;
>> +			syscon-otghs = <&scm_conf 0x33c>;
>>   		};
>>
>>   		aes: aes@4b501000 {
>
> We should still keep a separate entry for the phy in the dtsi
> files. And the phy should be a child of the scm_conf area in the
> dtsi file.
>
> This is because the scm and usb_otg_hs are separate devices and
> can be clocked separately. So the phy driver needs to be a
> separate driver to avoid spaghetti code and issues with clocking.

AFAIK SCM is clocked by L4CFG_L4_GICLK which is either free running or is 
managed automatically by the HW i.e gated when there is no access to the 
CTRL_MODULE_CORE registers.

Having a separate control-PHY driver only to do a regmap update to SCM is 
unnecessary IMHO.

Thanks
Kishon