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Signed-off-by: David Yang --- drivers/clk/clk-gate.c | 81 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 81 insertions(+) diff --git a/drivers/clk/clk-gate.c b/drivers/clk/clk-gate.c index 64283807600b..a70df4a2a9a7 100644 --- a/drivers/clk/clk-gate.c +++ b/drivers/clk/clk-gate.c @@ -12,8 +12,11 @@ #include #include #include +#include #include +#include "clk-of.h" + /** * DOC: basic gatable clock which can gate and ungate it's ouput * @@ -257,3 +260,81 @@ struct clk_hw *__devm_clk_hw_register_gate(struct device *dev, return hw; } EXPORT_SYMBOL_GPL(__devm_clk_hw_register_gate); + +#if IS_ENABLED(CONFIG_OF) +static const struct of_clk_flag of_clk_gate_flags[] = { + { "set-to-disable", CLK_GATE_SET_TO_DISABLE }, + { "hiword-mask", CLK_GATE_HIWORD_MASK }, + { "big-endian", CLK_GATE_BIG_ENDIAN }, + { } +}; + +static int of_clk_gate_setup(struct device_node *np) +{ + struct of_clk_ctrl *ctrl = np->parent->data; + const char *name; + void __iomem *reg; + u32 bit_idx; + + const char *property; + struct clk_hw *hw; + int ret; + + reg = of_clk_get_reg(np); + if (!reg) + return -ENOMEM; + name = of_clk_get_name(np); + if (!name) + return -EINVAL; + + property = "bits"; + if (of_property_read_u32(np, property, &bit_idx)) + goto err_property; + + hw = __clk_hw_register_gate(NULL, np, name, + of_clk_get_parent_name(np, 0), + NULL, NULL, of_clk_get_flags(np, NULL), + reg, bit_idx, + of_clk_get_flags(np, of_clk_gate_flags), + &ctrl->lock); + if (IS_ERR(hw)) + return PTR_ERR(hw); + + ret = of_clk_add_hw_provider(np, of_clk_hw_simple_get, hw); + if (ret) + goto err_register; + + np->data = hw; + return 0; + +err_register: + clk_hw_unregister(hw); + return ret; + +err_property: + pr_err("%s: clock %s missing required property \"%s\"\n", + __func__, name, property); + return -EINVAL; +} + +static void __init of_clk_gate_init(struct device_node *np) +{ + of_clk_gate_setup(np); +} +CLK_OF_DECLARE(of_clk_gate, "gate-clock", of_clk_gate_init); + +static const struct of_device_id of_clk_gate_ids[] = { + { .compatible = "gate-clock", .data = of_clk_gate_setup }, + { } +}; + +static struct platform_driver of_clk_gate_driver = { + .driver = { + .name = "clk_gate", + .of_match_table = of_clk_gate_ids, + }, + .probe = of_clk_probe, + .remove = of_clk_remove, +}; +builtin_platform_driver(of_clk_gate_driver); +#endif