netdev - Re: [PATCH v2 4/5] clk: socfpga: agilex: add clock driver for the Agilex5

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Date: Wed, 09 Aug 2023 14:26:40 -0700
From: Stephen Boyd <sboyd@...nel.org>
To: niravkumar.l.rabara@...el.com
Cc: adrian.ho.yin.ng@...el.com, andrew@...n.ch, conor+dt@...nel.org, devicetree@...r.kernel.org, dinguyen@...nel.org, krzysztof.kozlowski+dt@...aro.org, linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org, mturquette@...libre.com, netdev@...r.kernel.org, p.zabel@...gutronix.de, richardcochran@...il.com, robh+dt@...nel.org, wen.ping.teh@...el.com
Subject: Re: [PATCH v2 4/5] clk: socfpga: agilex: add clock driver for the Agilex5

Quoting niravkumar.l.rabara@...el.com (2023-07-31 18:02:33)
> diff --git a/drivers/clk/socfpga/clk-agilex.c b/drivers/clk/socfpga/clk-agilex.c
> index 74d21bd82710..3dcd0f233c17 100644
> --- a/drivers/clk/socfpga/clk-agilex.c
> +++ b/drivers/clk/socfpga/clk-agilex.c
> @@ -1,6 +1,6 @@
>  // SPDX-License-Identifier: GPL-2.0
>  /*
> - * Copyright (C) 2019, Intel Corporation
> + * Copyright (C) 2019-2023, Intel Corporation
>   */
>  #include <linux/slab.h>
>  #include <linux/clk-provider.h>
> @@ -9,6 +9,7 @@
>  #include <linux/platform_device.h>
>  
>  #include <dt-bindings/clock/agilex-clock.h>
> +#include <dt-bindings/clock/intel,agilex5-clkmgr.h>
>  
>  #include "stratix10-clk.h"
>  
> @@ -41,6 +42,67 @@ static const struct clk_parent_data mpu_free_mux[] = {
>           .name = "f2s-free-clk", },
>  };
>  
> +static const struct clk_parent_data core0_free_mux[] = {
> +       { .fw_name = "main_pll_c1",
> +         .name = "main_pll_c1", },

We're adding support for something new? Only set .fw_name in that case,
as .name will never be used. To do even better, set only .index so that
we don't do any string comparisons.

> +       { .fw_name = "peri_pll_c0",
> +         .name = "peri_pll_c0", },
> +       { .fw_name = "osc1",
> +         .name = "osc1", },
> +       { .fw_name = "cb-intosc-hs-div2-clk",
> +         .name = "cb-intosc-hs-div2-clk", },
> +       { .fw_name = "f2s-free-clk",
> +         .name = "f2s-free-clk", },
> +};
> +
[...]
> +
>  static int n5x_clk_register_c_perip(const struct n5x_perip_c_clock *clks,
>                                        int nums, struct stratix10_clock_data *data)
>  {
> @@ -535,6 +917,51 @@ static int n5x_clkmgr_init(struct platform_device *pdev)
>         return 0;
>  }
>  
> +static int agilex5_clkmgr_init(struct platform_device *pdev)
> +{
> +       struct device_node *np = pdev->dev.of_node;
> +       struct device *dev = &pdev->dev;
> +       struct stratix10_clock_data *clk_data;

Maybe call this stratix_data so that clk_data.clk_data is
stratix_data.clk_data.

> +       struct resource *res;
> +       void __iomem *base;
> +       int i, num_clks;
> +
> +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +       base = devm_ioremap_resource(dev, res);

This is a single function call, devm_platform_ioremap_resource().

> +       if (IS_ERR(base))
> +               return PTR_ERR(base);
> +
> +       num_clks = AGILEX5_NUM_CLKS;
> +
> +       clk_data = devm_kzalloc(dev, struct_size(clk_data, clk_data.hws,
> +                                                num_clks), GFP_KERNEL);
> +       if (!clk_data)
> +               return -ENOMEM;
> +
> +       for (i = 0; i < num_clks; i++)
> +               clk_data->clk_data.hws[i] = ERR_PTR(-ENOENT);
> +
> +       clk_data->base = base;
> +       clk_data->clk_data.num = num_clks;
> +
> +       agilex_clk_register_pll(agilex_pll_clks, ARRAY_SIZE(agilex_pll_clks),
> +                               clk_data);
> +
> +       agilex_clk_register_c_perip(agilex5_main_perip_c_clks,
> +                                   ARRAY_SIZE(agilex5_main_perip_c_clks),
> +                                   clk_data);
> +
> +       agilex_clk_register_cnt_perip(agilex5_main_perip_cnt_clks,
> +                                     ARRAY_SIZE(agilex5_main_perip_cnt_clks),
> +                                     clk_data);
> +
> +       agilex_clk_register_gate(agilex5_gate_clks,
> +                                ARRAY_SIZE(agilex5_gate_clks), clk_data);
> +
> +       of_clk_add_hw_provider(np, of_clk_hw_onecell_get, &clk_data->clk_data);

devm? Or when is this provider removed?

> +       return 0;
> +}
> +
>  static int agilex_clkmgr_probe(struct platform_device *pdev)
>  {
>         int (*probe_func)(struct platform_device *init_func);