linux-kernel - Re: [PATCH 2/3 v4] ARM: bcm2835: Add the Raspberry Pi firmware driver

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Message-ID: <87r3q072gl.fsf@eliezer.anholt.net>
Date:	Thu, 28 May 2015 15:38:02 -0700
From:	Eric Anholt <eric@...olt.net>
To:	Noralf Trønnes <noralf@...nnes.org>,
	linux-arm-kernel@...ts.infradead.org
Cc:	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-rpi-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/3 v4] ARM: bcm2835: Add the Raspberry Pi firmware driver

Noralf Trønnes <noralf@...nnes.org> writes:

> Den 28.05.2015 20:33, skrev Eric Anholt:
>> This gives us a function for making mailbox property channel requests
>> of the firmware, which is most notable in that it will let us get and
>> set clock rates.
>>
>> Signed-off-by: Eric Anholt <eric@...olt.net>
> ...
>> +static int rpi_firmware_probe(struct platform_device *pdev)
>> +{
>> +	struct device *dev = &pdev->dev;
>> +	struct rpi_firmware *fw;
>> +
>> +	fw = devm_kzalloc(dev, sizeof(*fw), GFP_KERNEL);
>> +	if (!fw)
>> +		return -ENOMEM;
>> +
>> +	fw->cl.dev = dev;
>> +	fw->cl.rx_callback = response_callback;
>> +	fw->cl.tx_block = true;
>> +
>> +	fw->chan = mbox_request_channel(&fw->cl, 0);
>> +	if (IS_ERR(fw->chan)) {
>> +		int ret = PTR_ERR(fw->chan);
>> +		if (ret != -EPROBE_DEFER)
>> +			dev_err(dev, "Failed to get mbox channel: %d\n", ret);
>> +		return ret;
>> +	}
>> +
>> +	init_completion(&fw->c);
>> +
>> +	platform_set_drvdata(pdev, fw);
>> +
>> +	rpi_firmware_print_firmware_revision(dev);
>> +
>> +	return 0;
>> +}
>> +
>> +static int rpi_firmware_remove(struct platform_device *pdev)
>> +{
>> +	struct rpi_firmware *fw = platform_get_drvdata(pdev);
>> +
>> +	mbox_free_channel(fw->chan);
>
> I guess driver data has to be reset here:
> platform_set_drvdata(pdev, NULL);

Fixed.

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