Re: [PATCH] clk: rockchip: Use flexible array for clock table

[Brian Masney <bmasney@redhat.com>]

Hi Rosen,

On Sun, May 10, 2026 at 08:22:52PM -0700, Rosen Penev wrote:
> Store the clock lookup table in the Rockchip clock provider
> allocation instead of allocating it separately.
> 
> This ties the table lifetime directly to the provider and removes a
> separate allocation failure path while preserving the clk_onecell_data
> lookup interface.
> 
> Assisted-by: Codex:GPT-5.5
> Signed-off-by: Rosen Penev <rosenp@gmail.com>
> ---
>  drivers/clk/rockchip/clk.c | 17 ++++-------------
>  drivers/clk/rockchip/clk.h |  2 ++
>  2 files changed, 6 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/clk/rockchip/clk.c b/drivers/clk/rockchip/clk.c
> index ee8c79b938d3..dbb4b6f33abb 100644
> --- a/drivers/clk/rockchip/clk.c
> +++ b/drivers/clk/rockchip/clk.c
> @@ -359,26 +359,21 @@ static struct rockchip_clk_provider *rockchip_clk_init_base(
>  		unsigned long nr_clks, bool has_late_clocks)
>  {
>  	struct rockchip_clk_provider *ctx;
> -	struct clk **clk_table;
>  	struct clk *default_clk_val;
>  	int i;
>  
>  	default_clk_val = ERR_PTR(has_late_clocks ? -EPROBE_DEFER : -ENOENT);
>  
> -	ctx = kzalloc_obj(struct rockchip_clk_provider);
> +	ctx = kzalloc_flex(*ctx, clk_table, nr_clks);
>  	if (!ctx)
>  		return ERR_PTR(-ENOMEM);
>  
> -	clk_table = kzalloc_objs(struct clk *, nr_clks);
> -	if (!clk_table)
> -		goto err_free;
> -
>  	for (i = 0; i < nr_clks; ++i)
> -		clk_table[i] = default_clk_val;
> +		ctx->clk_table[i] = default_clk_val;
>  
> -	ctx->reg_base = base;
> -	ctx->clk_data.clks = clk_table;
>  	ctx->clk_data.clk_num = nr_clks;
> +	ctx->clk_data.clks = ctx->clk_table;

Where's the __counted_by? Also struct clk_onecell_data is embedded
inside struct rockchip_clk_provider, and I'm not sure offhand how
that'll work.

Brian


> +	ctx->reg_base = base;
>  	ctx->cru_node = np;
>  	spin_lock_init(&ctx->lock);
>  
> @@ -388,10 +383,6 @@ static struct rockchip_clk_provider *rockchip_clk_init_base(
>  						   "rockchip,grf");
>  
>  	return ctx;
> -
> -err_free:
> -	kfree(ctx);
> -	return ERR_PTR(-ENOMEM);
>  }
>  
>  struct rockchip_clk_provider *rockchip_clk_init(struct device_node *np,
> diff --git a/drivers/clk/rockchip/clk.h b/drivers/clk/rockchip/clk.h
> index 9e3503e2ffc2..d4033bf750f5 100644
> --- a/drivers/clk/rockchip/clk.h
> +++ b/drivers/clk/rockchip/clk.h
> @@ -604,6 +604,7 @@ struct rockchip_aux_grf {
>   * @grf: regmap of the general-register-files syscon
>   * @aux_grf_table: hashtable of auxiliary GRF regmaps, indexed by grf_type
>   * @lock: maintains exclusion between callbacks for a given clock-provider.
> + * @clk_table: clock lookup table.
>   */
>  struct rockchip_clk_provider {
>  	void __iomem *reg_base;
> @@ -612,6 +613,7 @@ struct rockchip_clk_provider {
>  	struct regmap *grf;
>  	DECLARE_HASHTABLE(aux_grf_table, GRF_HASH_ORDER);
>  	spinlock_t lock;
> +	struct clk *clk_table[];
>  };
>  
>  struct rockchip_pll_rate_table {
> -- 
> 2.54.0
>