linux-kernel - Re: [DO NOT MERGE v5 14/37] clk: Compatible with narrow registers

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Message-ID: <20231205101045.tl43oexzbtelcazr@pengutronix.de>
Date:   Tue, 5 Dec 2023 11:10:45 +0100
From:   Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To:     Yoshinori Sato <ysato@...rs.sourceforge.jp>
Cc:     linux-sh@...r.kernel.org, Damien Le Moal <dlemoal@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Michael Turquette <mturquette@...libre.com>,
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        Daniel Vetter <daniel@...ll.ch>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
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Subject: Re: [DO NOT MERGE v5 14/37] clk: Compatible with narrow registers

Hello,

On Tue, Dec 05, 2023 at 06:45:33PM +0900, Yoshinori Sato wrote:
> @@ -675,13 +681,17 @@ 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_REG_8BIT - by default 32bit register accesses are used for
> + *	the gate register.  Setting this flag makes the register accesses 8bit.
> + * CLK_DIVIDER_REG_16BIT - by default 32bit register accesses are used for
> + *	the gate register.  Setting this flag makes the register accesses 16bit.
>   */
>  struct clk_divider {
>  	struct clk_hw	hw;
>  	void __iomem	*reg;
>  	u8		shift;
>  	u8		width;
> -	u8		flags;
> +	u32		flags;
>  	const struct clk_div_table	*table;
>  	spinlock_t	*lock;
>  };

I wonder why .flags was made bigger here. The two new flag values would
still fit into the u8, right?

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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