linux-kernel - Re: [PATCH 06/16] clk: at91: clk-main: factorize irq handling

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Date:	Thu, 1 Oct 2015 10:34:12 +0200
From:	Boris Brezillon <boris.brezillon@...e-electrons.com>
To:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc:	Nicolas Ferre <nicolas.ferre@...el.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-clk@...r.kernel.org
Subject: Re: [PATCH 06/16] clk: at91: clk-main: factorize irq handling

Hi Alexandre,

On Wed, 30 Sep 2015 18:10:59 +0200
Alexandre Belloni <alexandre.belloni@...e-electrons.com> wrote:

> The three different irq handlers are doing the same thing, factorize their
> code in a generic irq handler.
> 
> Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
> ---
>  drivers/clk/at91/clk-main.c | 43 ++++++++++++++++---------------------------
>  1 file changed, 16 insertions(+), 27 deletions(-)
> 
> diff --git a/drivers/clk/at91/clk-main.c b/drivers/clk/at91/clk-main.c
> index c1f119748bdc..79a380cd1f4e 100644
> --- a/drivers/clk/at91/clk-main.c
> +++ b/drivers/clk/at91/clk-main.c
> @@ -71,12 +71,21 @@ struct clk_sam9x5_main {
>  
>  #define to_clk_sam9x5_main(hw) container_of(hw, struct clk_sam9x5_main, hw)
>  
> -static irqreturn_t clk_main_osc_irq_handler(int irq, void *dev_id)
> +/* Generic structure */
> +struct clk_main {
> +	struct clk_hw hw;
> +	struct at91_pmc *pmc;
> +	unsigned int irq;
> +	wait_queue_head_t wait;
> +};
> +#define to_clk_main(hw) container_of(hw, struct clk_main, hw)

It wasn't clear to me at first glance that this structure was actually
a base struct for the clk_main_rc_osc and clk_sam9x5_main struct.
Maybe you should rename it into struct clk_main_base and then replace
the hw, pmc, irq and fields in the child structures by a base field.

Something like:

struct clk_sam9x5_main {
	struct clk_main_base base;
	u8 parent;
};

struct clk_main_rc_osc {
	struct clk_main_base base;
	unsigned long frequency;
	unsigned long accuracy;
};

Also, it would avoid any problem if someone decides to change the field
oder in one of those structures.

Best Regards,

Boris

-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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