diff options
Diffstat (limited to 'drivers/clk/tegra/clk-tegra20.c')
| -rw-r--r-- | drivers/clk/tegra/clk-tegra20.c | 32 |
1 files changed, 31 insertions, 1 deletions
diff --git a/drivers/clk/tegra/clk-tegra20.c b/drivers/clk/tegra/clk-tegra20.c index 636500a98561..cc857d4d4a86 100644 --- a/drivers/clk/tegra/clk-tegra20.c +++ b/drivers/clk/tegra/clk-tegra20.c @@ -1089,6 +1089,36 @@ static const struct of_device_id pmc_match[] __initconst = { { }, }; +static struct clk *tegra20_clk_src_onecell_get(struct of_phandle_args *clkspec, + void *data) +{ + struct clk_hw *parent_hw; + struct clk_hw *hw; + struct clk *clk; + + clk = of_clk_src_onecell_get(clkspec, data); + if (IS_ERR(clk)) + return clk; + + /* + * Tegra20 CDEV1 and CDEV2 clocks are a bit special case, their parent + * clock is created by the pinctrl driver. It is possible for clk user + * to request these clocks before pinctrl driver got probed and hence + * user will get an orphaned clock. That might be undesirable because + * user may expect parent clock to be enabled by the child. + */ + if (clkspec->args[0] == TEGRA20_CLK_CDEV1 || + clkspec->args[0] == TEGRA20_CLK_CDEV2) { + hw = __clk_get_hw(clk); + + parent_hw = clk_hw_get_parent(hw); + if (!parent_hw) + return ERR_PTR(-EPROBE_DEFER); + } + + return clk; +} + static void __init tegra20_clock_init(struct device_node *np) { struct device_node *node; @@ -1127,7 +1157,7 @@ static void __init tegra20_clock_init(struct device_node *np) tegra_init_dup_clks(tegra_clk_duplicates, clks, TEGRA20_CLK_CLK_MAX); - tegra_add_of_provider(np); + tegra_add_of_provider(np, tegra20_clk_src_onecell_get); tegra_register_devclks(devclks, ARRAY_SIZE(devclks)); tegra_clk_apply_init_table = tegra20_clock_apply_init_table; |