Re: [PATCH v3 06/14] clk: qcom: hfpll: get parent clock names from DT

Bjorn Andersson
2019-07-11T15:06:19Z

On Tue 25 Jun 09:47 PDT 2019, Jorge Ramirez-Ortiz wrote:

> Allow accessing the parent clock name required for the driver
> operation using the device tree node.
>
> This permits extending the driver to other platforms without having to
> modify its source code.
>
> For backwards compatibility leave the previous value as default.
>
> Co-developed-by: Niklas Cassel <niklas.cassel@linaro.org>
> Signed-off-by: Niklas Cassel <niklas.cassel@linaro.org>
> Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>

The driver should be updated to use parent_data instead, but I consider
that's an independent change.

Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>

> ---
> drivers/clk/qcom/hfpll.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/drivers/clk/qcom/hfpll.c b/drivers/clk/qcom/hfpll.c
> index a6de7101430c..87b7f46d27e0 100644
> --- a/drivers/clk/qcom/hfpll.c
> +++ b/drivers/clk/qcom/hfpll.c
> @@ -52,6 +52,7 @@ static int qcom_hfpll_probe(struct platform_device *pdev)
> void __iomem *base;
> struct regmap *regmap;
> struct clk_hfpll *h;
> + struct clk *pclk;
> struct clk_init_data init = {
> .parent_names = (const char *[]){ "xo" },
> .num_parents = 1,
> @@ -75,6 +76,13 @@ static int qcom_hfpll_probe(struct platform_device *pdev)
> 0, &init.name))
> return -ENODEV;
>
> + /* get parent clock from device tree (optional) */
> + pclk = devm_clk_get(dev, "xo");
> + if (!IS_ERR(pclk))
> + init.parent_names = (const char *[]){ __clk_get_name(pclk) };
> + else if (PTR_ERR(pclk) == -EPROBE_DEFER)
> + return -EPROBE_DEFER;
> +
> h->d = &hdata;
> h->clkr.hw.init = &init;
> spin_lock_init(&h->lock);
> --
> 2.21.0