[U-Boot] [i.MX8MM+CCF 07/41] clk: mux: add set parent support

Lukasz Majewski
2019-05-06T22:04:40Z

On Tue, 30 Apr 2019 10:17:54 +0000
Peng Fan <peng.fan@nxp.com> wrote:

> Add set parent support for clk mux
>

I suppose that it was ported from Linux kernel directly?

If yes, please state the SHA1 of Linux master (or exact tag).

> Signed-off-by: Peng Fan <peng.fan@nxp.com>
> ---
> drivers/clk/clk-mux.c | 70
> ++++++++++++++++++++++++++++++++++++++++++--
> include/linux/clk-provider.h | 2 ++ 2 files changed, 70
> insertions(+), 2 deletions(-)
>
> diff --git a/drivers/clk/clk-mux.c b/drivers/clk/clk-mux.c
> index 55fc97367a..1a937bf923 100644
> --- a/drivers/clk/clk-mux.c
> +++ b/drivers/clk/clk-mux.c
> @@ -60,7 +60,24 @@ int clk_mux_val_to_index(struct clk *clk, u32
> *table, unsigned int flags, return val;
> }
>
> -static u8 clk_mux_get_parent(struct clk *clk)
> +unsigned int clk_mux_index_to_val(u32 *table, unsigned int flags, u8
> index) +{
> + unsigned int val = index;
> +
> + if (table) {
> + val = table[index];
> + } else {
> + if (flags & CLK_MUX_INDEX_BIT)
> + val = 1 << index;
> +
> + if (flags & CLK_MUX_INDEX_ONE)
> + val++;
> + }
> +
> + return val;
> +}
> +
> +u8 clk_mux_get_parent(struct clk *clk)
> {
> struct clk_mux *mux = to_clk_mux(clk_dev_binded(clk) ?
> (struct clk
> *)dev_get_driver_data(clk->dev) : clk); @@ -72,8 +89,57 @@ static u8
> clk_mux_get_parent(struct clk *clk) return clk_mux_val_to_index(clk,
> mux->table, mux->flags, val); }
>
> +static int clk_fetch_parent_index(struct clk *clk,
> + struct clk *parent)
> +{
> + struct clk_mux *mux = to_clk_mux(clk_dev_binded(clk) ?
> + (struct clk
> *)dev_get_driver_data(clk->dev) : clk); +
> + int i;
> +
> + if (!parent)
> + return -EINVAL;
> +
> + for (i = 0; i < mux->num_parents; i++) {
> + if (!strcmp(parent->dev->name, mux->parent_names[i]))
> + return i;
> + }
> +
> + return -EINVAL;
> +}
> +
> +static int clk_mux_set_parent(struct clk *clk, struct clk *parent)
> +{
> + struct clk_mux *mux = to_clk_mux(clk_dev_binded(clk) ?
> + (struct clk
> *)dev_get_driver_data(clk->dev) : clk);
> + int index;
> + u32 val;
> + u32 reg;
> +
> + index = clk_fetch_parent_index(clk, parent);
> + if (index < 0) {
> + printf("Could not fetch index\n");
> + return index;
> + }
> +
> + val = clk_mux_index_to_val(mux->table, mux->flags, index);
> +
> + if (mux->flags & CLK_MUX_HIWORD_MASK) {
> + reg = mux->mask << (mux->shift + 16);
> + } else {
> + reg = readl(mux->reg);
> + reg &= ~(mux->mask << mux->shift);
> + }
> + val = val << mux->shift;
> + reg |= val;
> + writel(reg, mux->reg);
> +
> + return 0;
> +}
> +
> const struct clk_ops clk_mux_ops = {
> - .get_rate = clk_generic_get_rate,
> + .get_rate = clk_generic_get_rate,
> + .set_parent = clk_mux_set_parent,
> };
>
> struct clk *clk_hw_register_mux_table(struct device *dev, const char
> *name, diff --git a/include/linux/clk-provider.h
> b/include/linux/clk-provider.h index 3458746a60..216095d28c 100644
> --- a/include/linux/clk-provider.h
> +++ b/include/linux/clk-provider.h
> @@ -56,6 +56,8 @@ struct clk_mux {
> };
>
> #define to_clk_mux(_clk) container_of(_clk, struct clk_mux, clk)
> +extern const struct clk_ops clk_mux_ops;
> +u8 clk_mux_get_parent(struct clk *clk);
>
> struct clk_div_table {
> unsigned int val;

Best regards,

Lukasz Majewski

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