03.02.2020 14:28, Thierry Reding пишет:
> On Mon, Feb 03, 2020 at 01:42:59AM +0300, Dmitry Osipenko wrote:
>> Tools like Coccinelle may erroneously recommend to use the
>> devm_platform_ioremap_resource() API for the registers mapping because
>> these tools are not aware about the implementation details of the driver.
>> Let's add a clarifying comments to the code, which should help to stop
>> future attempts to break the driver.
>>
>> Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx>
>> ---
>> drivers/usb/phy/phy-tegra-usb.c | 8 ++++++++
>> 1 file changed, 8 insertions(+)
>>
>> diff --git a/drivers/usb/phy/phy-tegra-usb.c b/drivers/usb/phy/phy-tegra-usb.c
>> index 037e8eee737d..6153cc35aba0 100644
>> --- a/drivers/usb/phy/phy-tegra-usb.c
>> +++ b/drivers/usb/phy/phy-tegra-usb.c
>> @@ -969,6 +969,10 @@ static int utmi_phy_probe(struct tegra_usb_phy *tegra_phy,
>> return -ENXIO;
>> }
>>
>> + /*
>> + * Note that UTMI pad registers are shared by all PHYs, therefore
>> + * devm_platform_ioremap_resource() can't be used here.
>> + */
>> tegra_phy->pad_regs = devm_ioremap(&pdev->dev, res->start,
>> resource_size(res));
>> if (!tegra_phy->pad_regs) {
>> @@ -1087,6 +1091,10 @@ static int tegra_usb_phy_probe(struct platform_device *pdev)
>> return -ENXIO;
>> }
>>
>> + /*
>> + * Note that PHY and USB controller are using shared registers,
>> + * therefore devm_platform_ioremap_resource() can't be used here.
>> + */
>> tegra_phy->regs = devm_ioremap(&pdev->dev, res->start,
>> resource_size(res));
>> if (!tegra_phy->regs) {
>
> I'm not sure it's really going to stop *all* attempts. But at least for
> people that go through the trouble of reading the comments, yes, this
> should do the trick, so:
>
> Acked-by: Thierry Reding <treding@xxxxxxxxxx>
Will see, thanks :)
