[PATCH V2 09/12] clk: mediatek: reset: Add support for input offset and bit from DT
Rex-BC Chen
rex-bc.chen at mediatek.com
Wed Apr 20 22:36:14 PDT 2022
On Wed, 2022-04-20 at 21:05 +0800, Rex-BC Chen wrote:
> To use the clock reset function easier, we implement the of_xlate.
> This function is only adopted in version MTK_SET_CLR because of
> the method of id calculation.
>
> There is no impact for original use. If the argument number is not
> larger than 1, it will return original id.
>
> With this implementation if we want to set offset 0x120 and bit 16,
> we can just write something like "resets = <&infra_rst 0x120 16>;".
>
> Signed-off-by: Rex-BC Chen <rex-bc.chen at mediatek.com>
> ---
> drivers/clk/mediatek/reset.c | 24 ++++++++++++++++++++++++
> drivers/clk/mediatek/reset.h | 1 +
> 2 files changed, 25 insertions(+)
>
> diff --git a/drivers/clk/mediatek/reset.c
> b/drivers/clk/mediatek/reset.c
> index 1173111af3ab..dbe812062bf5 100644
> --- a/drivers/clk/mediatek/reset.c
> +++ b/drivers/clk/mediatek/reset.c
> @@ -59,6 +59,20 @@ static const struct reset_control_ops
> mtk_reset_ops_set_clr = {
> .reset = mtk_reset_set_clr,
> };
>
> +static int reset_xlate(struct reset_controller_dev *rcdev,
> + const struct of_phandle_args *reset_spec)
> +{
> + unsigned int offset, bit;
> +
> + if (reset_spec->args_count <= 1)
> + return reset_spec->args[0];
> +
> + offset = reset_spec->args[0];
> + bit = reset_spec->args[1];
> +
> + return (offset >> 4) * 32 + bit;
> +}
> +
> static const struct reset_control_ops *rst_op[MTK_RST_MAX] = {
> [MTK_RST_SIMPLE] = &reset_simple_ops,
> [MTK_RST_SET_CLR] = &mtk_reset_ops_set_clr,
> @@ -98,6 +112,11 @@ int mtk_clk_register_rst_ctrl(struct device_node
> *np,
> data->rcdev.ops = rst_op[desc->version];
> data->rcdev.of_node = np;
>
> + if (desc->version == MTK_RST_SET_CLR) {
> + data->rcdev.of_reset_n_cells = max(desc->reset_n_cells,
> 1);
> + data->rcdev.of_xlate = reset_xlate;
> + }
> +
> ret = reset_controller_register(&data->rcdev);
> if (ret) {
> pr_err("could not register reset controller: %d\n",
> ret);
> @@ -143,6 +162,11 @@ int mtk_clk_register_rst_ctrl_with_dev(struct
> device *dev,
> data->rcdev.of_node = np;
> data->rcdev.dev = dev;
>
> + if (desc->version == MTK_RST_SET_CLR) {
> + data->rcdev.of_reset_n_cells = max(desc->reset_n_cells,
> 1);
> + data->rcdev.of_xlate = reset_xlate;
> + }
> +
> ret = devm_reset_controller_register(dev, &data->rcdev);
> if (ret)
> dev_err(dev, "could not register reset controller:
> %d\n", ret);
> diff --git a/drivers/clk/mediatek/reset.h
> b/drivers/clk/mediatek/reset.h
> index 30559bf45f7e..4cfc281fc50d 100644
> --- a/drivers/clk/mediatek/reset.h
> +++ b/drivers/clk/mediatek/reset.h
> @@ -19,6 +19,7 @@ struct mtk_clk_rst_desc {
> u8 version;
> u32 reg_num;
> u16 reg_ofs;
> + int reset_n_cells;
> };
>
> struct mtk_clk_rst_data {
Hello all,
I think reset_xlate can also support for MTK_RST_SIMPLE.
If this patch is acceptable, I will modify for MTK_RST_SIMPLE in next
version.
BRs,
Rex
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