On 01/05, Charles Keepax wrote:
> Add an initial clock driver for the Arizona series audio CODECs.
> Currently this driver only provides support for parsing the two input
> clocks (mclk1, mclk2) and providing the internally consumed 32k clock.
>
> Signed-off-by: Charles Keepax <ckee...@opensource.wolfsonmicro.com>
Can this go through clk-tree without the other three patches and
nothing breaks?
> diff --git a/drivers/clk/clk-arizona.c b/drivers/clk/clk-arizona.c
> new file mode 100644
> index 0000000..1ab69ee
> --- /dev/null
> +++ b/drivers/clk/clk-arizona.c
> @@ -0,0 +1,192 @@
> +
> +static int arizona_32k_enable(struct clk_hw *hw)
> +{
> + struct arizona_clk *clkdata = clk32k_to_arizona_clk(hw);
> + struct arizona *arizona = clkdata->arizona;
> + int ret;
> +
> + switch (arizona->pdata.clk32k_src) {
> + case ARIZONA_32KZ_MCLK1:
> + ret = pm_runtime_get_sync(arizona->dev);
> + if (ret != 0)
typically we write this as
if (ret)
> + goto out;
> + break;
> + }
> +
> + ret = regmap_update_bits_async(arizona->regmap, ARIZONA_CLOCK_32K_1,
> + ARIZONA_CLK_32K_ENA,
> + ARIZONA_CLK_32K_ENA);
> +
> +out:
> + return ret;
> +}
> +
> +static int arizona_clk_of_get_pdata(struct arizona *arizona)
> +{
> + const char * const pins[] = { "mclk1", "mclk2" };
> + struct clk *mclk;
> + int i;
> +
> + if (!of_property_read_bool(arizona->dev->of_node, "clocks"))
> + return 0;
> +
> + for (i = 0; i < ARRAY_SIZE(pins); ++i) {
> + mclk = of_clk_get_by_name(arizona->dev->of_node, pins[i]);
> + if (IS_ERR(mclk))
> + return PTR_ERR(mclk);
> +
> + if (clk_get_rate(mclk) == CLK32K_RATE) {
> + arizona->pdata.clk32k_src = ARIZONA_32KZ_MCLK1 + i;
> + arizona->pdata.clk32k_parent = __clk_get_name(mclk);
> + }
> +
> + clk_put(mclk);
Is this configuring some mux for the 32kHz source? Perhaps this
can be done with assigned clock parents and a set_parent clk_op
instead of with of_clk_get_by_name() in a loop over the possible
parents?
> + }
> +
> + return 0;
> +}
> +
> +static int arizona_clk_probe(struct platform_device *pdev)
> +{
[..]
> +
> + if (arizona->pdata.clk32k_parent) {
> + clk32k_init.num_parents = 1;
> + clk32k_init.parent_names = &arizona->pdata.clk32k_parent;
> + } else {
> + clk32k_init.flags |= CLK_IS_ROOT;
> + }
> +
> + clkdata->clk32k_hw.init = &clk32k_init;
> + clkdata->clk32k = devm_clk_register(&pdev->dev, &clkdata->clk32k_hw);
> + if (IS_ERR(clkdata->clk32k)) {
> + ret = PTR_ERR(clkdata->clk32k);
> + dev_err(arizona->dev, "Failed to register 32k clock: %d\n",
> + ret);
> + return ret;
> + }
> +
> + ret = clk_register_clkdev(clkdata->clk32k, "arizona-32k",
> + dev_name(arizona->dev));
Any reason we register with clkdev but don't register an of clk
provider?
> + if (ret) {
> + dev_err(arizona->dev, "Failed to register 32k clock dev: %d\n",
> + ret);
> + return ret;
> + }
> +
> + platform_set_drvdata(pdev, clkdata);
> +
> + return 0;
> +}
--
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a Linux Foundation Collaborative Project
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