Subject: [PATCH v2 1/7] clk: sunxi: Add support for AXI, AHB, APB0 and APB1 gates

From: [email-masked] (Mike Turquette)
Date: Wed, 03 Apr 2013 14:48:15 -0700

Quoting Emilio L?pez (2013-03-27 14:20:37)
> diff --git a/drivers/clk/sunxi/clk-sunxi.c b/drivers/clk/sunxi/clk-sunxi.c
> index d528a24..244de90 100644
> --- a/drivers/clk/sunxi/clk-sunxi.c
> +++ b/drivers/clk/sunxi/clk-sunxi.c
> @@ -302,6 +302,82 @@ static void __init sunxi_divider_clk_setup(struct device_node *node,
>  }
>  
>  
> +

A lot of white space between these functions.

> +/**
> + * sunxi_gates_clk_setup() - Setup function for leaf gates on clocks
> + */
> +
> +#define SUNXI_GATES_MAX_SIZE   64
> +
> +struct gates_data {
> +       DECLARE_BITMAP(mask, SUNXI_GATES_MAX_SIZE);
> +};
> +
> +static const __initconst struct gates_data axi_gates_data = {
> +       .mask = {1},
> +};
> +
> +static const __initconst struct gates_data ahb_gates_data = {
> +       .mask = {0x7F77FFF, 0x14FB3F},
> +};
> +
> +static const __initconst struct gates_data apb0_gates_data = {
> +       .mask = {0x4EF},
> +};
> +
> +static const __initconst struct gates_data apb1_gates_data = {
> +       .mask = {0xFF00F7},
> +};
> +
> +static void __init sunxi_gates_clk_setup(struct device_node *node,
> +                                        struct gates_data *data)
> +{
> +       struct clk_onecell_data *clk_data;
> +       const char *clk_parent;
> +       const char *clk_name;
> +       void *reg;
> +       int qty;
> +       int i = 0;
> +       int j = 0;
> +       int ignore;
> +
> +       reg = of_iomap(node, 0);
> +
> +       clk_parent = of_clk_get_parent_name(node, 0);
> +
> +       /* Worst-case size approximation and memory allocation */
> +       qty = find_last_bit(data->mask, SUNXI_GATES_MAX_SIZE);
> +       clk_data = kmalloc(sizeof(struct clk_onecell_data), GFP_KERNEL);
> +       if (!clk_data)
> +               return;
> +       clk_data->clks = kzalloc((qty+1) * sizeof(struct clk *), GFP_KERNEL);
> +       if (!clk_data->clks) {
> +               kfree(clk_data);
> +               return;
> +       }
> +
> +       for_each_set_bit(i, data->mask, SUNXI_GATES_MAX_SIZE) {
> +               of_property_read_string_index(node, "clock-output-names",
> +                                             j, &clk_name);
> +
> +               /* No driver claims this clock, but it should remain gated */

Should the comment read, "ungated" instead of "gated"?

> +               ignore = !strcmp("ahb_sdram", clk_name) ? CLK_IGNORE_UNUSED : 0;
> +
> +               clk_data->clks[i] = clk_register_gate(NULL, clk_name,
> +                                                     clk_parent, ignore,
> +                                                     reg + 4 * (i/32), i % 32,
> +                                                     0, &clk_lock);
> +               WARN_ON(IS_ERR(clk_data->clks[i]));
> +
> +               j++;
> +       }
> +
> +       /* Adjust to the real max */
> +       clk_data->clk_num = i;
> +
> +       of_clk_add_provider(node, of_clk_src_onecell_get, clk_data);
> +}
> +
>  /* Matches for of_clk_init */
>  static const __initconst struct of_device_id clk_match[] = {
>         {.compatible = "fixed-clock", .data = of_fixed_clk_setup,},
> @@ -331,6 +407,15 @@ static const __initconst struct of_device_id clk_mux_match[] = {
>         {}
>  };
>  
> +/* Matches for gate clocks */
> +static const __initconst struct of_device_id clk_gates_match[] = {
> +       {.compatible = "allwinner,sun4i-axi-gates-clk", .data = &axi_gates_data,},
> +       {.compatible = "allwinner,sun4i-ahb-gates-clk", .data = &ahb_gates_data,},
> +       {.compatible = "allwinner,sun4i-apb0-gates-clk", .data = &apb0_gates_data,},
> +       {.compatible = "allwinner,sun4i-apb1-gates-clk", .data = &apb1_gates_data,},
> +       {}
> +};
> +
>  static void __init of_sunxi_table_clock_setup(const struct of_device_id *clk_match,
>                                               void *function)
>  {
> @@ -359,4 +444,7 @@ void __init sunxi_init_clocks(void)
>  
>         /* Register mux clocks */
>         of_sunxi_table_clock_setup(clk_mux_match, sunxi_mux_clk_setup);
> +
> +       /* Register gate clocks */
> +       of_sunxi_table_clock_setup(clk_gates_match, sunxi_gates_clk_setup);

I'm still a device tree noob, so this may be a dumb question.  Can the
above be converted to of_clk_init?

Regards,
Mike

>  }
> -- 
> 1.8.2