linux-kernel - Re: [PATCH] pwm: pxa: Use driver_data field to store pwm

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Message-ID: <CAMPhdO_EHEs82ffKGTuJ1j=ruOHYd0HCYPash9xNu9gdkX2=YQ@mail.gmail.com>
Date:	Mon, 1 Apr 2013 15:21:44 +0800
From:	Eric Miao <eric.y.miao@...il.com>
To:	Axel Lin <axel.lin@...ics.com>
Cc:	Thierry Reding <thierry.reding@...onic-design.de>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] pwm: pxa: Use driver_data field to store pwm_nr

On Mon, Apr 1, 2013 at 12:12 AM, Axel Lin <axel.lin@...ics.com> wrote:
> The driver_data field was used to store information about PWM_ID_BASE and
> HAS_SECONDARY_PWM. PWM_ID_BASE is not used now after convert to pwm framework.
> This patch stores the pwm_nr in driver_data field to simplify the code.
>
> Signed-off-by: Axel Lin <axel.lin@...ics.com>
> ---
>  drivers/pwm/pwm-pxa.c |   11 ++++-------
>  1 file changed, 4 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/pwm/pwm-pxa.c b/drivers/pwm/pwm-pxa.c
> index b789882..019a8e0 100644
> --- a/drivers/pwm/pwm-pxa.c
> +++ b/drivers/pwm/pwm-pxa.c
> @@ -22,13 +22,10 @@
>
>  #include <asm/div64.h>
>
> -#define HAS_SECONDARY_PWM      0x10
> -#define PWM_ID_BASE(d)         ((d) & 0xf)
> -
>  static const struct platform_device_id pwm_id_table[] = {
> -       /*   PWM    has_secondary_pwm? */
> -       { "pxa25x-pwm", 0 },
> -       { "pxa27x-pwm", 0 | HAS_SECONDARY_PWM },
> +       /*   PWM    pwm_nr */
> +       { "pxa25x-pwm", 1 },
> +       { "pxa27x-pwm", 2 },
>         { "pxa168-pwm", 1 },
>         { "pxa910-pwm", 1 },
>         { },
> @@ -145,7 +142,7 @@ static int pwm_probe(struct platform_device *pdev)
>         pwm->chip.dev = &pdev->dev;
>         pwm->chip.ops = &pxa_pwm_ops;
>         pwm->chip.base = -1;
> -       pwm->chip.npwm = (id->driver_data & HAS_SECONDARY_PWM) ? 2 : 1;
> +       pwm->chip.npwm = id->driver_data;

I'd rather keep the flag for a bit more readability?

>
>         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>         if (r == NULL) {
> --
> 1.7.10.4
>
>
>
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