It is better to place clk_enable() in phy_meson_g12a_usb2_init() and clk_disable() in phy_meson_g12a_usb2_exit().
For more detailed information, please see comments in the review of a similar driver in the Linux Kernel:
https://lore.kernel.org/all/CAFBinCCEhobbyKHuKDWzTYCQWgNT1-e8=7hMhq1mvT6CuEO...
Signed-off-by: Alexey Romanov avromanov@salutedevices.com Reviewed-by: Neil Armstrong neil.armstrong@linaro.org --- drivers/phy/meson-g12a-usb2.c | 19 ++++++++++++------- 1 file changed, 12 insertions(+), 7 deletions(-)
diff --git a/drivers/phy/meson-g12a-usb2.c b/drivers/phy/meson-g12a-usb2.c index a803b6796c..2ea0498f86 100644 --- a/drivers/phy/meson-g12a-usb2.c +++ b/drivers/phy/meson-g12a-usb2.c @@ -161,6 +161,14 @@ static int phy_meson_g12a_usb2_init(struct phy *phy) struct phy_meson_g12a_usb2_priv *priv = dev_get_priv(dev); int ret;
+#if CONFIG_IS_ENABLED(CLK) + ret = clk_enable(&priv->clk); + if (ret && ret != -ENOSYS && ret != -ENOTSUPP) { + pr_err("failed to enable PHY clock\n"); + return ret; + } +#endif + ret = reset_assert(&priv->reset); udelay(1); ret |= reset_deassert(&priv->reset); @@ -253,6 +261,10 @@ static int phy_meson_g12a_usb2_exit(struct phy *phy) struct phy_meson_g12a_usb2_priv *priv = dev_get_priv(dev); int ret;
+#if CONFIG_IS_ENABLED(CLK) + clk_disable(&priv->clk); +#endif + ret = reset_assert(&priv->reset); if (ret) return ret; @@ -290,13 +302,6 @@ int meson_g12a_usb2_phy_probe(struct udevice *dev) ret = clk_get_by_index(dev, 0, &priv->clk); if (ret < 0) return ret; - - ret = clk_enable(&priv->clk); - if (ret && ret != -ENOSYS && ret != -ENOTSUPP) { - pr_err("failed to enable PHY clock\n"); - clk_free(&priv->clk); - return ret; - } #endif
return 0;