linux-kernel - Re: [PATCH v3 1/2] [RFT] clk: samsung: add support for CPU clocks

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Message-ID: <163417617897.936110.4798836682696423903@swboyd.mtv.corp.google.com>
Date:   Wed, 13 Oct 2021 18:49:38 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Chanwoo Choi <cw00.choi@...sung.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Michael Turquette <mturquette@...libre.com>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Tomasz Figa <tomasz.figa@...il.com>,
        Will McVicker <willmcvicker@...gle.com>
Cc:     kernel-team@...roid.com, Will McVicker <willmcvicker@...gle.com>,
        linux-samsung-soc@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 1/2] [RFT] clk: samsung: add support for CPU clocks

Quoting Will McVicker (2021-10-13 15:10:19)
> diff --git a/drivers/clk/samsung/clk-cpu.c b/drivers/clk/samsung/clk-cpu.c
> index 00ef4d1b0888..b5017934fc41 100644
> --- a/drivers/clk/samsung/clk-cpu.c
> +++ b/drivers/clk/samsung/clk-cpu.c
> @@ -469,3 +469,29 @@ int __init exynos_register_cpu_clock(struct samsung_clk_provider *ctx,
>         kfree(cpuclk);
>         return ret;
>  }
> +
> +void samsung_clk_register_cpu(struct samsung_clk_provider *ctx,
> +               const struct samsung_cpu_clock *list, unsigned int nr_clk)
> +{
> +       unsigned int idx;
> +       unsigned int num_cfgs;
> +       struct clk *parent_clk, *alt_parent_clk;
> +       const struct clk_hw *parent_clk_hw = NULL;
> +       const struct clk_hw *alt_parent_clk_hw = NULL;
> +
> +       for (idx = 0; idx < nr_clk; idx++, list++) {
> +               /* find count of configuration rates in cfg */
> +               for (num_cfgs = 0; list->cfg[num_cfgs].prate != 0; )
> +                       num_cfgs++;
> +
> +               parent_clk = __clk_lookup(list->parent_name);

Please stop using __clk_lookup()

> +               if (parent_clk)
> +                       parent_clk_hw = __clk_get_hw(parent_clk);
> +               alt_parent_clk = __clk_lookup(list->alt_parent_name);

Can the DT binding be updated?

> +               if (alt_parent_clk)
> +                       alt_parent_clk_hw = __clk_get_hw(alt_parent_clk);
> +
> +               exynos_register_cpu_clock(ctx, list->id, list->name, parent_clk_hw,
> +                               alt_parent_clk_hw, list->offset, list->cfg, num_cfgs, list->flags);
> +       }
> +}
> diff --git a/drivers/clk/samsung/clk.c b/drivers/clk/samsung/clk.c
> index 1949ae7851b2..336243c6f120 100644
> --- a/drivers/clk/samsung/clk.c
> +++ b/drivers/clk/samsung/clk.c
> @@ -378,6 +378,8 @@ struct samsung_clk_provider * __init samsung_cmu_register_one(
>                 samsung_clk_extended_sleep_init(reg_base,
>                         cmu->clk_regs, cmu->nr_clk_regs,
>                         cmu->suspend_regs, cmu->nr_suspend_regs);
> +       if (cmu->cpu_clks)
> +               samsung_clk_register_cpu(ctx, cmu->cpu_clks, cmu->nr_cpu_clks);
>  
>         samsung_clk_of_add_provider(np, ctx);
>  
> diff --git a/drivers/clk/samsung/clk.h b/drivers/clk/samsung/clk.h
> index c1e1a6b2f499..a52a38cc1740 100644
> --- a/drivers/clk/samsung/clk.h
> +++ b/drivers/clk/samsung/clk.h
> @@ -271,6 +271,27 @@ struct samsung_pll_clock {
>         __PLL(_typ, _id, _name, _pname, CLK_GET_RATE_NOCACHE, _lock,    \
>               _con, _rtable)
>  
> +struct samsung_cpu_clock {
> +       unsigned int            id;
> +       const char              *name;
> +       const char              *parent_name;
> +       const char              *alt_parent_name;
> +       unsigned long           flags;
> +       int                     offset;
> +       const struct exynos_cpuclk_cfg_data *cfg;
> +};
> +
> +#define CPU_CLK(_id, _name, _pname, _apname, _flags, _offset, _cfg) \
> +       {                                                           \
> +               .id               = _id,                            \
> +               .name             = _name,                          \
> +               .parent_name      = _pname,                         \
> +               .alt_parent_name  = _apname,                        \
> +               .flags            = _flags,                         \
> +               .offset           = _offset,                        \
> +               .cfg              = _cfg,                           \
> +       }
> +
>  struct samsung_clock_reg_cache {
>         struct list_head node;
>         void __iomem *reg_base;
> @@ -301,6 +322,9 @@ struct samsung_cmu_info {
>         unsigned int nr_fixed_factor_clks;
>         /* total number of clocks with IDs assigned*/
>         unsigned int nr_clk_ids;
> +       /* list of cpu clocks and respective count */
> +       const struct samsung_cpu_clock *cpu_clks;
> +       unsigned int nr_cpu_clks;
>  
>         /* list and number of clocks registers */
>         const unsigned long *clk_regs;
> @@ -350,6 +374,8 @@ extern void __init samsung_clk_register_gate(struct samsung_clk_provider *ctx,
>  extern void __init samsung_clk_register_pll(struct samsung_clk_provider *ctx,
>                         const struct samsung_pll_clock *pll_list,
>                         unsigned int nr_clk, void __iomem *base);
> +extern void __init samsung_clk_register_cpu(struct samsung_clk_provider *ctx,

__init in header files is useless.

> +               const struct samsung_cpu_clock *list, unsigned int nr_clk);
>