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Message-ID: <55678BBC.5090507@tronnes.org>
Date: Thu, 28 May 2015 23:42:20 +0200
From: Noralf Trønnes <noralf@...nnes.org>
To: Eric Anholt <eric@...olt.net>, 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
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);
> +
> + return 0;
> +}
--
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