linux-kernel - Re: [PATCH v14 1/1] clk: npcm8xx: add clock controller

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Date:   Fri, 16 Dec 2022 10:44:00 -0800
From:   Stephen Boyd <sboyd@...nel.org>
To:     Tomer Maimon <tmaimon77@...il.com>, avifishman70@...il.com,
        benjaminfair@...gle.com, joel@....id.au, mturquette@...libre.com,
        tali.perry1@...il.com, venture@...gle.com, yuenn@...gle.com
Cc:     openbmc@...ts.ozlabs.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, Tomer Maimon <tmaimon77@...il.com>
Subject: Re: [PATCH v14 1/1] clk: npcm8xx: add clock controller

Quoting Tomer Maimon (2022-12-11 12:43:24)
> diff --git a/drivers/clk/clk-npcm8xx.c b/drivers/clk/clk-npcm8xx.c
> new file mode 100644
> index 000000000000..08ee7bea6f3a
> --- /dev/null
> +++ b/drivers/clk/clk-npcm8xx.c
> @@ -0,0 +1,650 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
[...]
> +#define NPCM8XX_CLK_S_RCP        "rcp"
> +
> +static const u32 pll_mux_table[] = { 0, 1, 2, 3 };
> +static const struct clk_parent_data pll_mux_parents[] = {
> +       { .fw_name = NPCM8XX_CLK_S_PLL0, .name = NPCM8XX_CLK_S_PLL0 },

As this is a new driver either you should only have .fw_name here. The
.name field is a backup to migrate code over to a new binding. When
.fw_name is used there should be an associated DT binding update. I
doubt the usage of .fw_name is correct though, because aren't these clks
internal to the controller? The .fw_name field is about describing
parents that are an input to the clk controller node in DT (because the
controller is a consumer of these clks that are external to the device).

So can you use the .hw field for these internal clks? Check out
CLK_HW_INIT_HWS() macro and friends for a possible way to initialize
this.

> +       { .fw_name = NPCM8XX_CLK_S_PLL1, .name = NPCM8XX_CLK_S_PLL1 },
> +       { .fw_name = NPCM8XX_CLK_S_REFCLK, .name = NPCM8XX_CLK_S_REFCLK },

Maybe this is external? If so, it would be great to have this in the
binding as a `clocks` property.