linux-kernel - Re: [PATCH v3 5/6] ARM: davinci: Add support for PRUSS on DA850

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Message-ID: <506EB6B7.4050705@ti.com>
Date:	Fri, 5 Oct 2012 16:00:15 +0530
From:	Sekhar Nori <nsekhar@...com>
To:	Matt Porter <mporter@...com>
CC:	Linux DaVinci Kernel List 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	Russell King <linux@....linux.org.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Hans J. Koch" <hjk@...sjkoch.de>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 5/6] ARM: davinci: Add support for PRUSS on DA850

On 10/4/2012 10:05 PM, Matt Porter wrote:
> On Thu, Oct 04, 2012 at 05:52:45PM +0530, Sekhar Nori wrote:
>> On 10/3/2012 8:25 PM, Matt Porter wrote:
>>> +static struct clk pruss_clk = {
>>> +	.name		= "pruss",
>>> +	.parent		= &pll0_sysclk2,
>>> +	.lpsc		= DA8XX_LPSC0_PRUSS,
>>> +};
>>> +
>>>  static struct clk uart0_clk = {
>>>  	.name		= "uart0",
>>>  	.parent		= &pll0_sysclk2,
>>> @@ -378,6 +384,7 @@ static struct clk_lookup da850_clks[] = {
>>>  	CLK(NULL,		"tptc1",	&tptc1_clk),
>>>  	CLK(NULL,		"tpcc1",	&tpcc1_clk),
>>>  	CLK(NULL,		"tptc2",	&tptc2_clk),
>>> +	CLK(NULL,		"pruss",	&pruss_clk),
>>
>> This is actually incorrect since we should use device name rather than
>> con_id for matching the clock. If there is just one clock that the
>> driver needs, connection id should be NULL. Looking at the driver now,
>> the clk_get() call seems to pass a valid device pointer. So, I wonder
>> how you are able to look up the clock even with a NULL device name.
> 
> I doublechecked the clk_get() find implentation to confirm that I indeed
> did get lucky here. Since pruss has only one instance and the clk_find()
> implementation looks for the best found match, it's able to find the
> clock just by the con_id, though it's not the "best possible" match in
> the find implementation...it's the "best found" match.. As you noted,
> this is incorrect though for a clock expected to be used from a driver
> context so I will address this in the update.

Thanks for debugging and clarifying.

Regards,
Sekhar
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