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SubjectRe: [PATCH] clk: socfpga: Don't have get_parent for single parent ops
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(Adding Dinh's korg email)

I also wonder if this driver is even used anymore or maybe we can delete
it?

Quoting Stephen Boyd (2018-12-04 11:34:16)
> This driver creates a gate clk with the possibility to have multiple
> parents. That can cause problems if the common clk framework tries to
> call the get_parent() op and gets back a number that's larger than the
> number of parents the clk says it supports in
> clk_init_data::num_parents. Let's duplicate the clk_ops structure each
> time this function is called and drop the get/set parent ops when there
> is only one parent. This allows the framework to consider a number
> larger than clk_init_data::num_parents as an error condition of the
> get_parent() clk op, clearing the way for proper code.
>
> Cc: Jerome Brunet <jbrunet@baylibre.com>
> Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
> Cc: Dinh Nguyen <dinguyen@opensource.altera.com>
> Signed-off-by: Stephen Boyd <sboyd@kernel.org>
> ---
> drivers/clk/socfpga/clk-gate.c | 22 +++++++++++++---------
> 1 file changed, 13 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/clk/socfpga/clk-gate.c b/drivers/clk/socfpga/clk-gate.c
> index aa7a6e6a15b6..73e03328d5c5 100644
> --- a/drivers/clk/socfpga/clk-gate.c
> +++ b/drivers/clk/socfpga/clk-gate.c
> @@ -176,8 +176,7 @@ static struct clk_ops gateclk_ops = {
> .set_parent = socfpga_clk_set_parent,
> };
>
> -static void __init __socfpga_gate_init(struct device_node *node,
> - const struct clk_ops *ops)
> +void __init socfpga_gate_init(struct device_node *node)
> {
> u32 clk_gate[2];
> u32 div_reg[3];
> @@ -188,12 +187,17 @@ static void __init __socfpga_gate_init(struct device_node *node,
> const char *clk_name = node->name;
> const char *parent_name[SOCFPGA_MAX_PARENTS];
> struct clk_init_data init;
> + struct clk_ops *ops;
> int rc;
>
> socfpga_clk = kzalloc(sizeof(*socfpga_clk), GFP_KERNEL);
> if (WARN_ON(!socfpga_clk))
> return;
>
> + ops = kmemdup(&gateclk_ops, sizeof(gateclk_ops), GFP_KERNEL);
> + if (WARN_ON(!ops))
> + return;
> +
> rc = of_property_read_u32_array(node, "clk-gate", clk_gate, 2);
> if (rc)
> clk_gate[0] = 0;
> @@ -202,8 +206,8 @@ static void __init __socfpga_gate_init(struct device_node *node,
> socfpga_clk->hw.reg = clk_mgr_base_addr + clk_gate[0];
> socfpga_clk->hw.bit_idx = clk_gate[1];
>
> - gateclk_ops.enable = clk_gate_ops.enable;
> - gateclk_ops.disable = clk_gate_ops.disable;
> + ops->enable = clk_gate_ops.enable;
> + ops->disable = clk_gate_ops.disable;
> }
>
> rc = of_property_read_u32(node, "fixed-divider", &fixed_div);
> @@ -234,6 +238,11 @@ static void __init __socfpga_gate_init(struct device_node *node,
> init.flags = 0;
>
> init.num_parents = of_clk_parent_fill(node, parent_name, SOCFPGA_MAX_PARENTS);
> + if (init.num_parents < 2) {
> + ops->get_parent = NULL;
> + ops->set_parent = NULL;
> + }
> +
> init.parent_names = parent_name;
> socfpga_clk->hw.hw.init = &init;
>
> @@ -246,8 +255,3 @@ static void __init __socfpga_gate_init(struct device_node *node,
> if (WARN_ON(rc))
> return;
> }
> -
> -void __init socfpga_gate_init(struct device_node *node)
> -{
> - __socfpga_gate_init(node, &gateclk_ops);
> -}

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