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SubjectRe: [PATCH linux-next v2 6/6] ASoC: rsnd: add avb clocks
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Hi Jiada

> There are AVB Counter Clocks in ADG, each clock has 12bits integral
> and 8 bits fractional dividers which operates with S0D1ϕ clock.
>
> This patch registers 8 AVB Counter Clocks when clock-cells of
> rcar_sound node is 2,
>
> Signed-off-by: Jiada Wang <jiada_wang@mentor.com>
> ---
(snip)
> +struct clk_avb {
> + struct clk_hw hw;
> + unsigned int idx;
> + struct rsnd_mod *mod;
> + /* lock reg access */
> + spinlock_t *lock;
> +};
> +
> +#define to_clk_avb(_hw) container_of(_hw, struct clk_avb, hw)

I like "hw_to_avb()"

> +static struct clk *rsnd_adg_clk_src_twocell_get(struct of_phandle_args *clkspec,
> + void *data)
> +{
> + unsigned int clkidx = clkspec->args[1];
> + struct rsnd_adg *adg = data;
> + const char *type;
> + struct clk *clk;
> +
> + switch (clkspec->args[0]) {
> + case ADG_FIX:
> + type = "fixed";
> + if (clkidx >= CLKOUTMAX) {
> + pr_err("Invalid %s clock index %u\n", type,
> + clkidx);
> + return ERR_PTR(-EINVAL);
> + }
> + clk = adg->clkout[clkidx];
> + break;
> + case ADG_AVB:
> + type = "avb";
> + if (clkidx >= AVB_CLK_NUM) {
> + pr_err("Invalid %s clock index %u\n", type,
> + clkidx);
> + return ERR_PTR(-EINVAL);
> + }
> + clk = adg->clkavb[clkidx];
> + break;
> + default:
> + pr_err("Invalid ADG clock type %u\n", clkspec->args[0]);
> + return ERR_PTR(-EINVAL);
> + }
> +
> + return clk;
> +}

In this function
1) I don't think you need to use "char *type".
2) If you use "clkidx = clkspec->args[1]", having same name for "clkspec->args[0]"
is readable.
3) please use dev_err() instad of pr_err()
I think data can be priv, and you can use rsnd_priv_to_adg(), rsnd_priv_to_dev()

> +static void clk_avb_div_write(struct rsnd_mod *mod, u32 data, int idx)
(snip)
> +static u32 clk_avb_div_read(struct rsnd_mod *mod, int idx)

To reduce confusion, and be more redable code,
I think these function can be

clk_avb_div_write(struct rsnd_adg *adg, u32 data);
clk_avb_div_read(struct rsnd_adg *adg);

> +static int clk_avb_set_rate(struct clk_hw *hw, unsigned long rate,
> + unsigned long parent_rate)
> +{
> + struct clk_avb *avb = to_clk_avb(hw);
> + unsigned int div = clk_avb_calc_div(rate, parent_rate);
> + u32 val;
> +
> + val = clk_avb_div_read(avb->mod, avb->idx) & ~AVB_DIV_MASK;
> + clk_avb_div_write(avb->mod, val | div, avb->idx);
> +
> + return 0;
> +}

Why do we need to care about ~AVB_DIV_MASK area ?
These are 0 Reserved, I think.

> +static const struct clk_ops clk_avb_ops = {
> + .enable = clk_avb_enable,
> + .disable = clk_avb_disable,
> + .is_enabled = clk_avb_is_enabled,
> + .recalc_rate = clk_avb_recalc_rate,
> + .round_rate = clk_avb_round_rate,
> + .set_rate = clk_avb_set_rate,
> +};

This is not a big deal, but I like tab aligned ops

> +static struct clk *clk_register_avb(struct device *dev, struct rsnd_mod *mod,
> + unsigned int id, spinlock_t *lock)
> +{
> + struct clk_init_data init;
> + struct clk_avb *avb;
> + struct clk *clk;
> + char name[AVB_CLK_NAME_SIZE];
> + const char *parent_name = ADG_CLK_NAME;
> +
> + avb = devm_kzalloc(dev, sizeof(*avb), GFP_KERNEL);
> + if (!avb)
> + return ERR_PTR(-ENOMEM);
> +
> + snprintf(name, AVB_CLK_NAME_SIZE, "%s%u", AVB_CLK_NAME, id);
> +
> + avb->idx = id;
> + avb->lock = lock;
> + avb->mod = mod;
> +
> + /* Register the clock. */
> + init.name = name;
> + init.ops = &clk_avb_ops;
> + init.flags = CLK_IS_BASIC;
> + init.parent_names = &parent_name;
> + init.num_parents = 1;
> +
> + avb->hw.init = &init;
> +
> + /* init DIV to a valid state */
> + clk_avb_div_write(avb->mod, avb->idx, AVB_MAX_DIV);

Please check parameter, I think you want to do is

- clk_avb_div_write(avb->mod, avb->idx, AVB_MAX_DIV);
+ clk_avb_div_write(avb->mod, AVB_MAX_DIV, avb->idx);

Best regards
---
Kuninori Morimoto
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