diff options
Diffstat (limited to 'drivers/clk/tegra/clk-tegra20.c')
| -rw-r--r-- | drivers/clk/tegra/clk-tegra20.c | 52 |
1 files changed, 47 insertions, 5 deletions
diff --git a/drivers/clk/tegra/clk-tegra20.c b/drivers/clk/tegra/clk-tegra20.c index 0ee56dd04cec..cc857d4d4a86 100644 --- a/drivers/clk/tegra/clk-tegra20.c +++ b/drivers/clk/tegra/clk-tegra20.c @@ -26,6 +26,8 @@ #include "clk.h" #include "clk-id.h" +#define MISC_CLK_ENB 0x48 + #define OSC_CTRL 0x50 #define OSC_CTRL_OSC_FREQ_MASK (3<<30) #define OSC_CTRL_OSC_FREQ_13MHZ (0<<30) @@ -831,15 +833,25 @@ static void __init tegra20_periph_clk_init(void) periph_clk_enb_refcnt); clks[TEGRA20_CLK_PEX] = clk; + /* dev1 OSC divider */ + clk_register_divider(NULL, "dev1_osc_div", "clk_m", + 0, clk_base + MISC_CLK_ENB, 22, 2, + CLK_DIVIDER_POWER_OF_TWO | CLK_DIVIDER_READ_ONLY, + NULL); + + /* dev2 OSC divider */ + clk_register_divider(NULL, "dev2_osc_div", "clk_m", + 0, clk_base + MISC_CLK_ENB, 20, 2, + CLK_DIVIDER_POWER_OF_TWO | CLK_DIVIDER_READ_ONLY, + NULL); + /* cdev1 */ - clk = clk_register_fixed_rate(NULL, "cdev1_fixed", NULL, 0, 26000000); - clk = tegra_clk_register_periph_gate("cdev1", "cdev1_fixed", 0, + clk = tegra_clk_register_periph_gate("cdev1", "cdev1_mux", 0, clk_base, 0, 94, periph_clk_enb_refcnt); clks[TEGRA20_CLK_CDEV1] = clk; /* cdev2 */ - clk = clk_register_fixed_rate(NULL, "cdev2_fixed", NULL, 0, 26000000); - clk = tegra_clk_register_periph_gate("cdev2", "cdev2_fixed", 0, + clk = tegra_clk_register_periph_gate("cdev2", "cdev2_mux", 0, clk_base, 0, 93, periph_clk_enb_refcnt); clks[TEGRA20_CLK_CDEV2] = clk; @@ -1077,6 +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; @@ -1115,7 +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; |