linux-kernel - Re: [PATCH 2/3] clk: thead: add support for the T-HEAD TH1520 CCU

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Date:   Mon, 12 Jun 2023 18:35:41 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Conor Dooley <conor+dt@...nel.org>,
        Jisheng Zhang <jszhang@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, Wei Fu <wefu@...hat.com>,
        Yangtao Li <frank.li@...o.com>, mturquette@...libre.com
Cc:     linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        Icenowy Zheng <uwu@...nowy.me>
Subject: Re: [PATCH 2/3] clk: thead: add support for the T-HEAD TH1520 CCU

Quoting Yangtao Li (2023-05-14 22:44:00)
> diff --git a/drivers/clk/clk-th1520.c b/drivers/clk/clk-th1520.c
> new file mode 100644
> index 000000000000..5dfa9e5207e2
> --- /dev/null
> +++ b/drivers/clk/clk-th1520.c
> @@ -0,0 +1,999 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2023 Vivo Communication Technology Co. Ltd.
> + * Authors: Yangtao Li <frank.li@...o.com>
> + */
> +
[....]
> +
> +
> +static CLK_FIXED_FACTOR_HW(pll_gmac_100m_clk, "pll-gmac-100m",
> +                          &pll_gmac_clk.common.hw,
> +                          10, 1, 0);
> +
> +static const char * const uart_parents[] = { "pll-gmac-100m", "osc24m" };
> +struct ccu_mux uart_clk = {
> +       .mux    = TH_CCU_ARG(0, 1),
> +       .common = {
> +               .reg            = 0x210,
> +               .hw.init        = CLK_HW_INIT_PARENTS("uart",

Don't use strings for clk tree topology. Instead use clk_parent_data or
clk_hw pointers directly.

> +                                             uart_parents,
> +                                             &ccu_mux_ops,
> +                                             0),
> +       }
> +};
> +};
> +
> +static const struct regmap_config config = {

Namespace this, th1520_clk_regmap_config[]

> +       .reg_bits = 32,
> +       .val_bits = 32,
> +       .reg_stride = 4,
> +       .fast_io = true,
> +};
> +
> +static int th1520_clock_probe(struct platform_device *pdev)
> +{
> +       struct device *dev = &pdev->dev;
> +       struct regmap *map;
> +       void __iomem *regs;
> +       int ret, i;
> +
> +       regs = devm_platform_ioremap_resource(pdev, 0);
> +       if (IS_ERR(regs))
> +               return PTR_ERR(regs);
> +
> +       map = devm_regmap_init_mmio(dev, regs, &config);
> +       if (IS_ERR(map))
> +               return PTR_ERR(map);
> +
> +       for (i = 0; i < ARRAY_SIZE(th1520_clks); i++)
> +               th1520_clks[i]->map = map;
> +
> +       for (i = 0; i < th1520_hw_clks.num; i++) {
> +               ret = devm_clk_hw_register(dev, th1520_hw_clks.hws[i]);
> +               if (ret)
> +                       return ret;
> +       }
> +
> +       ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get,
> +                                       &th1520_hw_clks);
> +       if (ret)
> +               return ret;
> +
> +       return 0;
> +}
> +
> +static const struct of_device_id clk_match_table[] = {

Namespace this, th1520_clk_match_table[]

> +       {
> +               .compatible = "thead,th1520-ccu",
> +       },
> +       { /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, clk_match_table);
> +