diff options
| author | Dmitry Osipenko <digetx@gmail.com> | 2020-02-03 01:42:59 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-02-10 22:12:15 +0300 |
| commit | a4a601948fc8d0a9661b83df03f5ee11e903efe6 (patch) | |
| tree | 4a155f8910613ad8b0980ff2ebc0db375f804316 /drivers/usb/phy | |
| parent | 8099f58f1ecddf4f374f4828a3dff8397c7cbd74 (diff) | |
| download | linux-a4a601948fc8d0a9661b83df03f5ee11e903efe6.tar.xz | |
usb: phy: tegra: Add clarifying comments about the shared registers
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@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20200202224259.29187-1-digetx@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/phy')
| -rw-r--r-- | drivers/usb/phy/phy-tegra-usb.c | 8 |
1 files changed, 8 insertions, 0 deletions
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) { |