linux-kernel - Re: [PATCH 2/7] ARM: bcm2835: Add a Raspberry Pi-specific clock driver.

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Date:	Thu, 04 Jun 2015 20:56:30 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Eric Anholt <eric@...olt.net>
CC:	linux-arm-kernel@...ts.infradead.org,
	linux-rpi-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Lee Jones <lee@...nel.org>, devicetree@...r.kernel.org,
	Mike Turquette <mturquette@...aro.org>,
	Stephen Boyd <sboyd@...eaurora.org>
Subject: Re: [PATCH 2/7] ARM: bcm2835: Add a Raspberry Pi-specific clock driver.

On 05/29/2015 03:02 PM, Eric Anholt wrote:
> Stephen Warren <swarren@...dotorg.org> writes:
> 
>> On 05/18/2015 01:43 PM, Eric Anholt wrote:

>>> +static struct clk *rpi_firmware_delayed_get_clk(struct 
>>> of_phandle_args *clkspec, + void *_data)
>> 
>>> +	rpi_clk = &rpi_clocks[clkspec->args[0]]; + +	firmware_node =
>>> of_parse_phandle(of_node, "firmware", 0); +	if (!firmware_node)
>>> { +		dev_err(dev, "%s: Missing firmware node\n",
>>> rpi_clk->name); +		return ERR_PTR(-ENODEV); +	} + +	/* Try a
>>> no-op transaction to see if the driver is loaded yet. */ +	ret
>>> = rpi_firmware_property_list(firmware_node, NULL, 0); +	if
>>> (ret) +		return ERR_PTR(ret);
>> 
>> I would move all that into this driver's probe().
> 
> We can't move all this into the driver's probe, because this is
> where we're returning -EPROBE_DEFER.  We could potentially do just
> the phandle parse up front and allocate some memory to pass it and
> our own device node to this function through the _data arg, but I
> don't see much point.

Well, once the clock core correctly supports deferred probe, that can
be moved.

Aside from that, I think all your other replies to my replies in this
thread/series make sense.
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