From: Thierry Reding <thierry.reding@gmail.com>
To: Lukasz Majewski <lukma@denx.de>
Cc: Sascha Hauer <s.hauer@pengutronix.de>,
Stefan Agner <stefan@agner.ch>,
Boris Brezillon <boris.brezillon@free-electrons.com>,
linux-pwm@vger.kernel.org,
Bhuvanchandra DV <bhuvanchandra.dv@toradex.com>,
linux-kernel@vger.kernel.org,
Lothar Wassmann <LW@karo-electronics.de>,
kernel@pengutronix.de, Fabio Estevam <fabio.estevam@nxp.com>,
Lukasz Majewski <l.majewski@majess.pl>
Subject: Re: [PATCH v5 05/11] pwm: imx: Move PWMv2 software reset code to a separate function
Date: Mon, 30 Jan 2017 08:26:10 +0100 [thread overview]
Message-ID: <20170130072610.GJ3585@ulmo.ba.sec> (raw)
In-Reply-To: <1485726855-16236-6-git-send-email-lukma@denx.de>
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On Sun, Jan 29, 2017 at 10:54:09PM +0100, Lukasz Majewski wrote:
> From: Lukasz Majewski <l.majewski@majess.pl>
>
> The software reset code has been extracted from imx_pwm_config_v2 function
> and moved to new one - imx_pwm_sw_reset().
>
> This change reduces the overall size of imx_pwm_config_v2() and prepares
> it for atomic PWM operation.
>
> Suggested-by: Stefan Agner <stefan@agner.ch>
> Suggested-by: Boris Brezillon <boris.brezillon@free-electrons.com>
> Signed-off-by: Lukasz Majewski <l.majewski@majess.pl>
>
> ---
> Changes for v5:
> - None
>
> Changes for v4:
> - None
>
> Changes for v3:
> - None
>
> Changes for v2:
> - Add missing parenthesis
> ---
> drivers/pwm/pwm-imx.c | 31 +++++++++++++++++++++----------
> 1 file changed, 21 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/pwm/pwm-imx.c b/drivers/pwm/pwm-imx.c
> index 11e3f3e..f0d78f3 100644
> --- a/drivers/pwm/pwm-imx.c
> +++ b/drivers/pwm/pwm-imx.c
> @@ -120,6 +120,25 @@ static void imx_pwm_disable_v1(struct pwm_chip *chip, struct pwm_device *pwm)
> clk_disable_unprepare(imx->clk_per);
> }
>
> +static void imx_pwm_sw_reset(struct pwm_chip *chip)
> +{
> + struct imx_chip *imx = to_imx_chip(chip);
> + struct device *dev = chip->dev;
> + int wait_count = 0;
> + u32 cr;
> +
> + writel(MX3_PWMCR_SWR, imx->mmio_base + MX3_PWMCR);
> + do {
> + usleep_range(200, 1000);
> + cr = readl(imx->mmio_base + MX3_PWMCR);
> + } while ((cr & MX3_PWMCR_SWR) &&
> + (wait_count++ < MX3_PWM_SWR_LOOP));
I think you could replace this by one of the accessors from
linux/iopoll.h, but that can be a separate patch.
Thierry
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next prev parent reply other threads:[~2017-01-30 7:26 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-29 21:54 [PATCH v5 00/11] pwm: imx: Provide atomic operation for IMX PWM driver Lukasz Majewski
2017-01-29 21:54 ` [PATCH v5 01/11] pwm: print error messages with pr_err() instead of pr_debug() Lukasz Majewski
2017-01-29 21:54 ` [PATCH v5 02/11] pwm: imx: remove ipg clock and enable per clock when required Lukasz Majewski
2017-01-29 21:54 ` [PATCH v5 03/11] pwm: imx: Add separate set of pwm ops for PWMv1 and PWMv2 Lukasz Majewski
2017-01-30 7:23 ` Thierry Reding
2017-01-30 7:43 ` Thierry Reding
2017-01-30 8:36 ` Lukasz Majewski
2017-01-30 8:45 ` Thierry Reding
2017-01-30 8:55 ` Lukasz Majewski
2017-01-30 9:04 ` Thierry Reding
2017-01-29 21:54 ` [PATCH v5 04/11] pwm: imx: Rewrite imx_pwm_*_v1 code to facilitate switch to atomic pwm operation Lukasz Majewski
2017-01-29 21:54 ` [PATCH v5 05/11] pwm: imx: Move PWMv2 software reset code to a separate function Lukasz Majewski
2017-01-30 7:26 ` Thierry Reding [this message]
2017-01-29 21:54 ` [PATCH v5 06/11] pwm: imx: Move PWMv2 wait for fifo slot " Lukasz Majewski
2017-01-29 21:54 ` [PATCH v5 07/11] pwm: imx: Provide atomic PWM support for i.MX PWMv2 Lukasz Majewski
2017-01-30 7:49 ` Boris Brezillon
2017-01-30 7:54 ` Thierry Reding
2017-01-29 21:54 ` [PATCH v5 08/11] pwm: imx: Remove redundant i.MX PWMv2 code Lukasz Majewski
2017-01-29 21:54 ` [PATCH v5 09/11] pwm: core: make the PWM_POLARITY flag in DTB optional Lukasz Majewski
2017-01-29 21:54 ` [PATCH v5 10/11] pwm: imx: doc: Update imx-pwm.txt documentation entry Lukasz Majewski
2017-01-29 21:54 ` [PATCH v5 11/11] pwm: imx: Add polarity inversion support to i.MX's PWMv2 Lukasz Majewski
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