linux-kernel - Re: [PATCH 04/11] clk: divider: Introduce CLK_DIVIDER_EVEN

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Date: Wed, 10 Apr 2024 20:06:34 -0700
From: Stephen Boyd <sboyd@...nel.org>
To: Conor Dooley <conor+dt@...nel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Linus Walleij <linus.walleij@...aro.org>, Michael Turquette <mturquette@...libre.com>, Philipp Zabel <p.zabel@...gutronix.de>, Rob Herring <robh@...nel.org>, Théo Lebrun <theo.lebrun@...tlin.com>
Cc: linux-mips@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org, linux-gpio@...r.kernel.org, Vladimir Kondratiev <vladimir.kondratiev@...ileye.com>, Gregory CLEMENT <gregory.clement@...tlin.com>, Thomas Petazzoni <thomas.petazzoni@...tlin.com>, Tawfik Bayouk <tawfik.bayouk@...ileye.com>, Théo Lebrun <theo.lebrun@...tlin.com>
Subject: Re: [PATCH 04/11] clk: divider: Introduce CLK_DIVIDER_EVEN_INTEGERS flag

Quoting Théo Lebrun (2024-04-10 10:12:33)
> index 4a537260f655..cb348e502e41 100644
> --- a/include/linux/clk-provider.h
> +++ b/include/linux/clk-provider.h
> @@ -675,13 +675,15 @@ struct clk_div_table {
>   * CLK_DIVIDER_BIG_ENDIAN - By default little endian register accesses are used
>   *     for the divider register.  Setting this flag makes the register accesses
>   *     big endian.
> + * CLK_DIVIDER_EVEN_INTEGERS - clock divisor is 2, 4, 6, 8, 10, etc.
> + *     Formula is 2 * (value read from hardware + 1).
>   */
>  struct clk_divider {
>         struct clk_hw   hw;
>         void __iomem    *reg;
>         u8              shift;
>         u8              width;
> -       u8              flags;
> +       u16             flags;

This can stay u8

>         const struct clk_div_table      *table;
>         spinlock_t      *lock;
>  };

We should add a kunit test.