From: Thierry Reding <[email protected]> Currently the Tegra clock driver simplifies the clock tree somewhat by taking advantage of the fact that clk_m runs at the same frequency as the oscillator. While that's true on all currently supported SoCs, it does not apply to Tegra210 anymore. On Tegra210 clk_m is typically divided down from the oscillator frequency. To support that setup, add a separate clock for the oscillator that both clk_m and pll_ref derive from.
Modify the tegra_osc_clk_init() function to take an additional divider parameter for clk_m. Existing SoCs always pass in 1, whereas Tegra210 will read the divider from a register in the clock & reset controller. Signed-off-by: Thierry Reding <[email protected]> --- drivers/clk/tegra/clk-tegra-fixed.c | 24 +++++++++++++----------- drivers/clk/tegra/clk-tegra124.c | 3 ++- drivers/clk/tegra/clk-tegra30.c | 3 ++- drivers/clk/tegra/clk.h | 8 ++++---- 4 files changed, 21 insertions(+), 17 deletions(-) diff --git a/drivers/clk/tegra/clk-tegra-fixed.c b/drivers/clk/tegra/clk-tegra-fixed.c index f3b773833429..605676d368eb 100644 --- a/drivers/clk/tegra/clk-tegra-fixed.c +++ b/drivers/clk/tegra/clk-tegra-fixed.c @@ -30,13 +30,12 @@ #define OSC_CTRL_OSC_FREQ_SHIFT 28 #define OSC_CTRL_PLL_REF_DIV_SHIFT 26 -int __init tegra_osc_clk_init(void __iomem *clk_base, - struct tegra_clk *tegra_clks, - unsigned long *input_freqs, int num, - unsigned long *osc_freq, - unsigned long *pll_ref_freq) +int __init tegra_osc_clk_init(void __iomem *clk_base, struct tegra_clk *clks, + unsigned long *input_freqs, unsigned int num, + unsigned int clk_m_div, unsigned long *osc_freq, + unsigned long *pll_ref_freq) { - struct clk *clk; + struct clk *clk, *osc; struct clk **dt_clk; u32 val, pll_ref_div; unsigned osc_idx; @@ -54,22 +53,25 @@ int __init tegra_osc_clk_init(void __iomem *clk_base, return -EINVAL; } - dt_clk = tegra_lookup_dt_id(tegra_clk_clk_m, tegra_clks); + osc = clk_register_fixed_rate(NULL, "osc", NULL, CLK_IS_ROOT, + *osc_freq); + + dt_clk = tegra_lookup_dt_id(tegra_clk_clk_m, clks); if (!dt_clk) return 0; - clk = clk_register_fixed_rate(NULL, "clk_m", NULL, CLK_IS_ROOT, - *osc_freq); + clk = clk_register_fixed_factor(NULL, "clk_m", "osc", + 0, 1, clk_m_div); *dt_clk = clk; /* pll_ref */ val = (val >> OSC_CTRL_PLL_REF_DIV_SHIFT) & 3; pll_ref_div = 1 << val; - dt_clk = tegra_lookup_dt_id(tegra_clk_pll_ref, tegra_clks); + dt_clk = tegra_lookup_dt_id(tegra_clk_pll_ref, clks); if (!dt_clk) return 0; - clk = clk_register_fixed_factor(NULL, "pll_ref", "clk_m", + clk = clk_register_fixed_factor(NULL, "pll_ref", "osc", 0, 1, pll_ref_div); *dt_clk = clk; diff --git a/drivers/clk/tegra/clk-tegra124.c b/drivers/clk/tegra/clk-tegra124.c index 29b39c8c3151..f1fa29ec7951 100644 --- a/drivers/clk/tegra/clk-tegra124.c +++ b/drivers/clk/tegra/clk-tegra124.c @@ -1480,7 +1480,8 @@ static void __init tegra124_132_clock_init_pre(struct device_node *np) return; if (tegra_osc_clk_init(clk_base, tegra124_clks, tegra124_input_freq, - ARRAY_SIZE(tegra124_input_freq), &osc_freq, &pll_ref_freq) < 0) + ARRAY_SIZE(tegra124_input_freq), 1, &osc_freq, + &pll_ref_freq) < 0) return; tegra_fixed_clk_init(tegra124_clks); diff --git a/drivers/clk/tegra/clk-tegra30.c b/drivers/clk/tegra/clk-tegra30.c index 0659db79d1c5..4b26509fc218 100644 --- a/drivers/clk/tegra/clk-tegra30.c +++ b/drivers/clk/tegra/clk-tegra30.c @@ -1434,7 +1434,8 @@ static void __init tegra30_clock_init(struct device_node *np) return; if (tegra_osc_clk_init(clk_base, tegra30_clks, tegra30_input_freq, - ARRAY_SIZE(tegra30_input_freq), &input_freq, NULL) < 0) + ARRAY_SIZE(tegra30_input_freq), 1, &input_freq, + NULL) < 0) return; diff --git a/drivers/clk/tegra/clk.h b/drivers/clk/tegra/clk.h index 48cb1c13ede5..d6ac00647faf 100644 --- a/drivers/clk/tegra/clk.h +++ b/drivers/clk/tegra/clk.h @@ -615,10 +615,10 @@ void tegra_periph_clk_init(void __iomem *clk_base, void __iomem *pmc_base, void tegra_pmc_clk_init(void __iomem *pmc_base, struct tegra_clk *tegra_clks); void tegra_fixed_clk_init(struct tegra_clk *tegra_clks); -int tegra_osc_clk_init(void __iomem *clk_base, struct tegra_clk *tegra_clks, - unsigned long *input_freqs, int num, - unsigned long *osc_freq, - unsigned long *pll_ref_freq); +int tegra_osc_clk_init(void __iomem *clk_base, struct tegra_clk *clks, + unsigned long *input_freqs, unsigned int num, + unsigned int clk_m_div, unsigned long *osc_freq, + unsigned long *pll_ref_freq); void tegra_super_clk_gen4_init(void __iomem *clk_base, void __iomem *pmc_base, struct tegra_clk *tegra_clks, struct tegra_clk_pll_params *pll_params); -- 2.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
