linux-kernel - Re: [PATCH 2/5] ARM: davinci: da8xx: add usb phy clocks

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Message-ID: <56E9A01B.3010503@cogentembedded.com>
Date:	Wed, 16 Mar 2016 21:04:11 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	David Lechner <david@...hnology.com>, Sekhar Nori <nsekhar@...com>,
	Kevin Hilman <khilman@...nel.org>,
	Alan Stern <stern@...land.harvard.edu>, Bin Liu <b-liu@...com>,
	Petr Kulhavy <petr@...ix.com>
Cc:	Russell King <linux@....linux.org.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Felipe Balbi <balbi@...nel.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org
Subject: Re: [PATCH 2/5] ARM: davinci: da8xx: add usb phy clocks

On 03/16/2016 08:58 PM, David Lechner wrote:

>>> +static struct clk usb20_clk = {
>>> +    .name        = "usb20",
>>> +    .parent        = &pll0_sysclk2,
>>> +    .lpsc        = DA8XX_LPSC1_USB20,
>>> +    .gpsc        = 1,
>>> +};
>>
>>     Why move it?
>
> For organization, to keep all of the USB clocks together. I can leave it alone
> if that is preferred.

    I'd prefer to minimize the noise...

>>> +
>>> +    /* Set the mux depending on the parent clock. */
>>> +    if (clk->parent == &pll0_aux_clk)
>>> +        val |= CFGCHIP2_USB2PHYCLKMUX;
>>> +    else if (clk->parent == &usb_ref_clk)
>>> +        val &= ~CFGCHIP2_USB2PHYCLKMUX;
>>
>>     Don't we have clk_set_parent()for that?
>
> Yes. clk_set_parent() is already called in a loop for all clocks elsewhere, so
> not needed here.

    No, I mean why is not this implemented as a part of clk_set_parent()?

MBR, Sergei