Re: [PATCH v4 1/6] clk: sunxi: Let divs clocks read the base factor clock name from devicetree

Chen-Yu Tsai
2015-10-30T07:46:29Z

On Wed, Oct 28, 2015 at 12:50 AM, Jens Kuske <jenskuske-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> Currently, the sunxi clock driver gets the name for the base factor clock
> of divs clocks from the name field in factors_data. This prevents reusing
> of the factor clock for clocks with same properties, but different name.
>
> This commit makes the divs setup function try to get a name from
> clock-output-names in the devicetree. It also removes the name field where
> possible and merges the sun4i PLL5 and PLL6 clocks.

This patch actually removes all static declarations of the name field,
which is a good thing!

>
> Signed-off-by: Jens Kuske <jenskuske-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> ---
> drivers/clk/sunxi/clk-sunxi.c | 38 +++++++++++++++++++++++++++-----------
> 1 file changed, 27 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/clk/sunxi/clk-sunxi.c b/drivers/clk/sunxi/clk-sunxi.c
> index 9c79af0c..270de42 100644
> --- a/drivers/clk/sunxi/clk-sunxi.c
> +++ b/drivers/clk/sunxi/clk-sunxi.c
> @@ -704,21 +704,12 @@ static const struct factors_data sun4i_pll5_data __initconst = {
> .enable = 31,
> .table = &sun4i_pll5_config,
> .getter = sun4i_get_pll5_factors,
> - .name = "pll5",
> -};
> -
> -static const struct factors_data sun4i_pll6_data __initconst = {
> - .enable = 31,
> - .table = &sun4i_pll5_config,
> - .getter = sun4i_get_pll5_factors,
> - .name = "pll6",
> };
>
> static const struct factors_data sun6i_a31_pll6_data __initconst = {
> .enable = 31,
> .table = &sun6i_a31_pll6_config,
> .getter = sun6i_a31_get_pll6_factors,
> - .name = "pll6x2",
> };
>
> static const struct factors_data sun5i_a13_ahb_data __initconst = {
> @@ -902,6 +893,7 @@ struct gates_data {
>
> #define SUNXI_DIVS_MAX_QTY 4
> #define SUNXI_DIVISOR_WIDTH 2
> +#define SUNXI_DIVS_BASE_NAME_MAX_LEN 8
>
> struct divs_data {
> const struct factors_data *factors; /* data for the factor clock */
> @@ -941,7 +933,7 @@ static const struct divs_data pll5_divs_data __initconst = {
> };
>
> static const struct divs_data pll6_divs_data __initconst = {
> - .factors = &sun4i_pll6_data,
> + .factors = &sun4i_pll5_data,
> .ndivs = 4,
> .div = {
> { .shift = 0, .table = pll6_sata_tbl, .gate = 14 }, /* M, SATA */
> @@ -983,6 +975,8 @@ static void __init sunxi_divs_clk_setup(struct device_node *node,
> struct clk_gate *gate = NULL;
> struct clk_fixed_factor *fix_factor;
> struct clk_divider *divider;
> + struct factors_data factors = *data->factors;
> + char base_name[SUNXI_DIVS_BASE_NAME_MAX_LEN];
> void __iomem *reg;
> int ndivs = SUNXI_DIVS_MAX_QTY, i = 0;
> int flags, clkflags;
> @@ -991,8 +985,30 @@ static void __init sunxi_divs_clk_setup(struct device_node *node,
> if (data->ndivs)
> ndivs = data->ndivs;
>
> + /* Try to find a name for base factor clock */
> + for (i = 0; i < ndivs; i++) {
> + if (data->div[i].self) {
> + of_property_read_string_index(node, "clock-output-names",
> + i, &factors.name);
> + break;
> + }
> + }
> + /* If we don't have a .self clk use the first output-name up to '_' */

This actually only works for the sun4i divs clocks. sun6i-a31-pll6 uses a
different naming convention. sun4i-a10-pll2 uses yet another, though that's
not a divs clock. Maybe we should work on unifying them. Maxime?

Other than these 2 bits of information, this patch looks good.

Regards
ChenYu

> + if (factors.name == NULL) {
> + of_property_read_string_index(node, "clock-output-names",
> + 0, &clk_name);
> +
> + for (i = 0; i < SUNXI_DIVS_BASE_NAME_MAX_LEN - 1 &&
> + clk_name[i] != '_' &&
> + clk_name[i] != '\0'; i++)
> + base_name[i] = clk_name[i];
> +
> + base_name[i] = '\0';
> + factors.name = base_name;
> + }
> +
> /* Set up factor clock that we will be dividing */
> - pclk = sunxi_factors_clk_setup(node, data->factors);
> + pclk = sunxi_factors_clk_setup(node, &factors);
> parent = __clk_get_name(pclk);
>
> reg = of_iomap(node, 0);
> --
> 2.6.2
>