[PATCH v2 01/11] clk: sunxi: register factors clocks behind composite
Mike Turquette
mturquette at linaro.org
Tue Dec 17 21:55:27 EST 2013
Quoting Emilio López (2013-12-17 16:44:53)
> This commit reworks factors clock registration to be done behind a
> composite clock. This allows us to additionally add a gate, mux or
> divisors, as it will be needed by some future PLLs.
>
> Signed-off-by: Emilio López <emilio at elopez.com.ar>
> Acked-by: Maxime Ripard <maxime.ripard at free-electrons.com>
> ---
> drivers/clk/sunxi/clk-factors.c | 63 +--------------------------------------
> drivers/clk/sunxi/clk-factors.h | 16 +++++-----
> drivers/clk/sunxi/clk-sunxi.c | 66 ++++++++++++++++++++++++++++++++++++++---
> 3 files changed, 72 insertions(+), 73 deletions(-)
>
> diff --git a/drivers/clk/sunxi/clk-factors.c b/drivers/clk/sunxi/clk-factors.c
> index f05207a..9e23264 100644
> --- a/drivers/clk/sunxi/clk-factors.c
> +++ b/drivers/clk/sunxi/clk-factors.c
> @@ -30,14 +30,6 @@
> * parent - fixed parent. No clk_set_parent support
> */
>
> -struct clk_factors {
> - struct clk_hw hw;
> - void __iomem *reg;
> - struct clk_factors_config *config;
> - void (*get_factors) (u32 *rate, u32 parent, u8 *n, u8 *k, u8 *m, u8 *p);
> - spinlock_t *lock;
> -};
> -
> #define to_clk_factors(_hw) container_of(_hw, struct clk_factors, hw)
>
> #define SETMASK(len, pos) (((1U << (len)) - 1) << (pos))
> @@ -120,61 +112,8 @@ static int clk_factors_set_rate(struct clk_hw *hw, unsigned long rate,
> return 0;
> }
>
> -static const struct clk_ops clk_factors_ops = {
> +const struct clk_ops clk_factors_ops = {
> .recalc_rate = clk_factors_recalc_rate,
> .round_rate = clk_factors_round_rate,
> .set_rate = clk_factors_set_rate,
> };
> -
> -/**
> - * clk_register_factors - register a factors clock with
> - * the clock framework
> - * @dev: device registering this clock
> - * @name: name of this clock
> - * @parent_name: name of clock's parent
> - * @flags: framework-specific flags
> - * @reg: register address to adjust factors
> - * @config: shift and width of factors n, k, m and p
> - * @get_factors: function to calculate the factors for a given frequency
> - * @lock: shared register lock for this clock
> - */
> -struct clk *clk_register_factors(struct device *dev, const char *name,
> - const char *parent_name,
> - unsigned long flags, void __iomem *reg,
> - struct clk_factors_config *config,
> - void (*get_factors)(u32 *rate, u32 parent,
> - u8 *n, u8 *k, u8 *m, u8 *p),
> - spinlock_t *lock)
> -{
> - struct clk_factors *factors;
> - struct clk *clk;
> - struct clk_init_data init;
> -
> - /* allocate the factors */
> - factors = kzalloc(sizeof(struct clk_factors), GFP_KERNEL);
> - if (!factors) {
> - pr_err("%s: could not allocate factors clk\n", __func__);
> - return ERR_PTR(-ENOMEM);
> - }
> -
> - init.name = name;
> - init.ops = &clk_factors_ops;
> - init.flags = flags;
> - init.parent_names = (parent_name ? &parent_name : NULL);
> - init.num_parents = (parent_name ? 1 : 0);
> -
> - /* struct clk_factors assignments */
> - factors->reg = reg;
> - factors->config = config;
> - factors->lock = lock;
> - factors->hw.init = &init;
> - factors->get_factors = get_factors;
> -
> - /* register the clock */
> - clk = clk_register(dev, &factors->hw);
> -
> - if (IS_ERR(clk))
> - kfree(factors);
> -
> - return clk;
> -}
> diff --git a/drivers/clk/sunxi/clk-factors.h b/drivers/clk/sunxi/clk-factors.h
> index f49851c..02e1a43 100644
> --- a/drivers/clk/sunxi/clk-factors.h
> +++ b/drivers/clk/sunxi/clk-factors.h
> @@ -17,11 +17,13 @@ struct clk_factors_config {
> u8 pwidth;
> };
>
> -struct clk *clk_register_factors(struct device *dev, const char *name,
> - const char *parent_name,
> - unsigned long flags, void __iomem *reg,
> - struct clk_factors_config *config,
> - void (*get_factors) (u32 *rate, u32 parent_rate,
> - u8 *n, u8 *k, u8 *m, u8 *p),
> - spinlock_t *lock);
> +struct clk_factors {
> + struct clk_hw hw;
> + void __iomem *reg;
> + struct clk_factors_config *config;
> + void (*get_factors) (u32 *rate, u32 parent, u8 *n, u8 *k, u8 *m, u8 *p);
> + spinlock_t *lock;
> +};
> +
> +extern const struct clk_ops clk_factors_ops;
> #endif
> diff --git a/drivers/clk/sunxi/clk-sunxi.c b/drivers/clk/sunxi/clk-sunxi.c
> index 8fc1375..6f756f4 100644
> --- a/drivers/clk/sunxi/clk-sunxi.c
> +++ b/drivers/clk/sunxi/clk-sunxi.c
> @@ -255,7 +255,11 @@ static void sun4i_get_apb1_factors(u32 *freq, u32 parent_rate,
> * sunxi_factors_clk_setup() - Setup function for factor clocks
> */
>
> +#define SUNXI_FACTORS_MUX_MASK 0x3
> +
> struct factors_data {
> + int enable;
> + int mux;
> struct clk_factors_config *table;
> void (*getter) (u32 *rate, u32 parent_rate, u8 *n, u8 *k, u8 *m, u8 *p);
> };
> @@ -306,16 +310,70 @@ static void __init sunxi_factors_clk_setup(struct device_node *node,
> struct factors_data *data)
> {
> struct clk *clk;
> + struct clk_factors *factors;
> + struct clk_gate *gate = NULL;
> + struct clk_mux *mux = NULL;
> + struct clk_hw *gate_hw = NULL;
> + struct clk_hw *mux_hw = NULL;
> const char *clk_name = node->name;
> - const char *parent;
> + const char *parents[5];
Seems like 5 is a magic number? I guess this type of clock always has
the same number of parents? Might be good to use a preprocessor macro
here.
Otherwise the patch looks good to me.
Regards,
Mike
> void *reg;
> + int i = 0;
>
> reg = of_iomap(node, 0);
>
> - parent = of_clk_get_parent_name(node, 0);
> + /* if we have a mux, we will have >1 parents */
> + while (i < 5 && (parents[i] = of_clk_get_parent_name(node, i)) != NULL)
> + i++;
> +
> + factors = kzalloc(sizeof(struct clk_factors), GFP_KERNEL);
> + if (!factors)
> + return;
>
> - clk = clk_register_factors(NULL, clk_name, parent, 0, reg,
> - data->table, data->getter, &clk_lock);
> + /* Add a gate if this factor clock can be gated */
> + if (data->enable) {
> + gate = kzalloc(sizeof(struct clk_gate), GFP_KERNEL);
> + if (!gate) {
> + kfree(factors);
> + return;
> + }
> +
> + /* set up gate properties */
> + gate->reg = reg;
> + gate->bit_idx = data->enable;
> + gate->lock = &clk_lock;
> + gate_hw = &gate->hw;
> + }
> +
> + /* Add a mux if this factor clock can be muxed */
> + if (data->mux) {
> + mux = kzalloc(sizeof(struct clk_mux), GFP_KERNEL);
> + if (!mux) {
> + kfree(factors);
> + kfree(gate);
> + return;
> + }
> +
> + /* set up gate properties */
> + mux->reg = reg;
> + mux->shift = data->mux;
> + mux->mask = SUNXI_FACTORS_MUX_MASK;
> + mux->lock = &clk_lock;
> + mux_hw = &mux->hw;
> + }
> +
> + /* set up factors properties */
> + factors->reg = reg;
> + factors->config = data->table;
> + factors->get_factors = data->getter;
> + factors->lock = &clk_lock;
> +
> + clk = clk_register_composite(NULL, clk_name,
> + parents, i,
> + mux_hw, &clk_mux_ops,
> + &factors->hw, &clk_factors_ops,
> + gate_hw, &clk_gate_ops,
> + i ? 0 : CLK_IS_ROOT);
>
> if (!IS_ERR(clk)) {
> of_clk_add_provider(node, of_clk_src_simple_get, clk);
> --
> 1.8.5.1
>
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