Subject: Re: [PATCH V4 03/11] clk: imx: scu: add two cells binding support

From: Stephen Boyd <[email-masked]>
Date: Fri, 06 Sep 2019 10:06:42 -0700

Quoting Dong Aisheng (2019-08-20 04:13:17)
> diff --git a/drivers/clk/imx/clk-imx8qxp.c b/drivers/clk/imx/clk-imx8qxp.c
> index 5e2903e..1ad3f2a 100644
> --- a/drivers/clk/imx/clk-imx8qxp.c
> +++ b/drivers/clk/imx/clk-imx8qxp.c
> @@ -134,7 +134,12 @@ static int imx8qxp_clk_probe(struct platform_device *pdev)
>                                 i, PTR_ERR(clks[i]));
>         }
>  
> -       return of_clk_add_hw_provider(ccm_node, of_clk_hw_onecell_get, clk_data);
> +       if (clock_cells == 2)

Can you just read this from the DT node again instead of having a global
variable called "clock_cells" for this?

> +               ret = of_clk_add_hw_provider(ccm_node, imx_scu_of_clk_src_get, imx_scu_clks);
> +       else
> +               ret = of_clk_add_hw_provider(ccm_node, of_clk_hw_onecell_get, clk_data);
> +
> +       return ret;
>  }
>  
>  static const struct of_device_id imx8qxp_match[] = {
> diff --git a/drivers/clk/imx/clk-scu.c b/drivers/clk/imx/clk-scu.c
> index fbef740..48bfb08 100644
> --- a/drivers/clk/imx/clk-scu.c
> +++ b/drivers/clk/imx/clk-scu.c
> @@ -16,6 +19,21 @@
>  #define IMX_SIP_SET_CPUFREQ            0x00
>  
>  static struct imx_sc_ipc *ccm_ipc_handle;
> +struct device_node *pd_np;
> +u32 clock_cells;
> +
> +struct imx_scu_clk_node {
> +       const char *name;
> +       u32 rsrc;
> +       u8 clk_type;
> +       const char * const *parents;
> +       int num_parents;
> +
> +       struct clk_hw *hw;
> +       struct list_head node;
> +};
> +
> +struct list_head imx_scu_clks[IMX_SC_R_LAST];
>  
>  /*
>   * struct clk_scu - Description of one SCU clock
> @@ -128,9 +146,29 @@ static inline struct clk_scu *to_clk_scu(struct clk_hw *hw)
>         return container_of(hw, struct clk_scu, hw);
>  }
>  
> -int imx_clk_scu_init(void)
> +int imx_clk_scu_init(struct device_node *np)
>  {
> -       return imx_scu_get_handle(&ccm_ipc_handle);
> +       struct platform_device *pd_dev;
> +       int ret, i;
> +
> +       ret = imx_scu_get_handle(&ccm_ipc_handle);
> +       if (ret)
> +               return ret;
> +
> +       if (of_property_read_u32(np, "#clock-cells", &clock_cells))
> +               return -EINVAL;
> +
> +       if (clock_cells == 2) {
> +               for (i = 0; i < IMX_SC_R_LAST; i++)
> +                       INIT_LIST_HEAD(&imx_scu_clks[i]);
> +
> +               pd_np = of_find_compatible_node(NULL, NULL, "fsl,scu-pd");
> +               pd_dev = of_find_device_by_node(pd_np);
> +               if (!pd_dev || !device_is_bound(&pd_dev->dev))
> +                       return -EPROBE_DEFER;

Do you need to put some nodes here with of_node_put() one failure or
when they're done being used?

> +       }
> +
> +       return 0;
>  }
>  
>  /*
> @@ -387,3 +425,99 @@ struct clk_hw *__imx_clk_scu(const char *name, const char * const *parents,
[...]
> +
> +struct clk_hw *imx_clk_scu_alloc_dev(const char *name,
> +                                    const char * const *parents,
> +                                    int num_parents, u32 rsrc_id, u8 clk_type)
> +{
> +       struct imx_scu_clk_node clk = {
> +               .name = name,
> +               .rsrc = rsrc_id,
> +               .clk_type = clk_type,
> +               .parents = parents,
> +               .num_parents = num_parents,
> +       };
> +       struct platform_device *pdev;
> +       int ret;
> +
> +       pdev = platform_device_alloc(name, PLATFORM_DEVID_NONE);
> +       if (!pdev) {
> +               pr_err("%s: failed to allocate scu clk dev rsrc %d type %d\n",
> +                      name, rsrc_id, clk_type);
> +               return ERR_PTR(-ENOMEM);
> +       }
> +
> +       ret = platform_device_add_data(pdev, &clk, sizeof(clk));
> +       if (ret) {
> +               platform_device_put(pdev);
> +               return ERR_PTR(-ENOMEM);

Why not ERR_PTR(ret)?

> +       }
> +
> +       pdev->driver_override = "imx-scu-clk";
> +
> +       ret = imx_clk_scu_attach_pd(&pdev->dev, rsrc_id);
> +       if (ret)
> +               pr_warn("%s: failed to attached the power domain %d\n",
> +                       name, ret);
> +
> +       platform_device_add(pdev);
> +
> +       /* For API backwards compatiblilty, simply return NULL for success */
> +       return NULL;
> +}

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