From: Lukasz Majewski <l.majewski@majess.pl>
To: Thierry Reding <thierry.reding@gmail.com>,
Sascha Hauer <s.hauer@pengutronix.de>,
Stefan Agner <stefan@agner.ch>,
linux-pwm@vger.kernel.org,
Bhuvanchandra DV <bhuvanchandra.dv@toradex.com>,
linux-kernel@vger.kernel.org
Cc: Fabio Estevam <fabio.estevam@nxp.com>,
Fabio Estevam <festevam@gmail.com>,
Boris Brezillon <boris.brezillon@free-electrons.com>,
Lothar Wassmann <LW@karo-electronics.de>,
kernel@pengutronix.de, Lothar Wassmann <LW@karo-electronics.de>,
Lukasz Majewski <l.majewski@majess.pl>
Subject: [PATCH v3 RESEND 09/11] pwm: core: make the PWM_POLARITY flag in DTB optional
Date: Mon, 26 Dec 2016 23:55:59 +0100 [thread overview]
Message-ID: <1482792961-12702-10-git-send-email-l.majewski@majess.pl> (raw)
In-Reply-To: <1482792961-12702-1-git-send-email-l.majewski@majess.pl>
From: Lothar Wassmann <LW@KARO-electronics.de>
Change the pwm chip driver registration, so that a chip driver that
supports polarity inversion can still be used with DTBs that don't
provide the 'PWM_POLARITY' flag.
This is done to provide polarity inversion support for the pwm-imx
driver without having to modify all existing DTS files.
Signed-off-by: Lothar Wassmann <LW@KARO-electronics.de>
Signed-off-by: Bhuvanchandra DV <bhuvanchandra.dv@toradex.com>
Suggested-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Lukasz Majewski <l.majewski@majess.pl>
---
Changes for v3:
- None
Changes for v2:
- None
---
drivers/pwm/core.c | 22 ++++++++++++----------
1 file changed, 12 insertions(+), 10 deletions(-)
diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index ec7179f..d80e5c5 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -137,9 +137,14 @@ of_pwm_xlate_with_flags(struct pwm_chip *pc, const struct of_phandle_args *args)
{
struct pwm_device *pwm;
+ /* check, whether the driver supports a third cell for flags */
if (pc->of_pwm_n_cells < 3)
return ERR_PTR(-EINVAL);
+ /* flags in the third cell are optional */
+ if (args->args_count < 2)
+ return ERR_PTR(-EINVAL);
+
if (args->args[0] >= pc->npwm)
return ERR_PTR(-EINVAL);
@@ -148,11 +153,10 @@ of_pwm_xlate_with_flags(struct pwm_chip *pc, const struct of_phandle_args *args)
return pwm;
pwm->args.period = args->args[1];
+ pwm->args.polarity = PWM_POLARITY_NORMAL;
- if (args->args[2] & PWM_POLARITY_INVERTED)
+ if (args->args_count > 2 && args->args[2] & PWM_POLARITY_INVERTED)
pwm->args.polarity = PWM_POLARITY_INVERSED;
- else
- pwm->args.polarity = PWM_POLARITY_NORMAL;
return pwm;
}
@@ -163,9 +167,14 @@ of_pwm_simple_xlate(struct pwm_chip *pc, const struct of_phandle_args *args)
{
struct pwm_device *pwm;
+ /* sanity check driver support */
if (pc->of_pwm_n_cells < 2)
return ERR_PTR(-EINVAL);
+ /* all cells are required */
+ if (args->args_count != pc->of_pwm_n_cells)
+ return ERR_PTR(-EINVAL);
+
if (args->args[0] >= pc->npwm)
return ERR_PTR(-EINVAL);
@@ -674,13 +683,6 @@ struct pwm_device *of_pwm_get(struct device_node *np, const char *con_id)
goto put;
}
- if (args.args_count != pc->of_pwm_n_cells) {
- pr_debug("%s: wrong #pwm-cells for %s\n", np->full_name,
- args.np->full_name);
- pwm = ERR_PTR(-EINVAL);
- goto put;
- }
-
pwm = pc->of_xlate(pc, &args);
if (IS_ERR(pwm))
goto put;
--
2.1.4
next prev parent reply other threads:[~2016-12-26 22:58 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-23 21:45 [PATCH 0/6] pwm: imx: Provide atomic operation for IMX PWM driver Lukasz Majewski
2016-10-23 21:45 ` [PATCH 1/6] pwm: imx: Rewrite imx_pwm_*_v1 code to facilitate switch to atomic pwm operation Lukasz Majewski
2016-10-24 15:21 ` Boris Brezillon
2016-10-25 5:54 ` Sascha Hauer
2016-10-25 6:27 ` Boris Brezillon
2016-10-25 6:32 ` Sascha Hauer
2016-10-25 6:42 ` Boris Brezillon
2016-10-25 6:55 ` Lukasz Majewski
2016-10-23 21:45 ` [PATCH 2/6] pwm: imx: Move PWMv2 software reset code to a separate function Lukasz Majewski
2016-10-24 15:23 ` Boris Brezillon
2016-10-24 21:02 ` Lukasz Majewski
2016-10-23 21:45 ` [PATCH 3/6] pwm: imx: Move PWMv2 wait for fifo slot " Lukasz Majewski
2016-10-24 15:23 ` Boris Brezillon
2016-10-23 21:45 ` [PATCH 4/6] pwm: imx: Provide atomic PWM support for IMXv2 PWM Lukasz Majewski
2016-10-24 15:25 ` Boris Brezillon
2016-10-23 21:45 ` [PATCH 5/6] pwm: imx: Remove redundant IMX PWMv2 code Lukasz Majewski
2016-10-24 15:27 ` Boris Brezillon
2016-10-23 21:45 ` [PATCH 6/6] pwm: imx: Introduce "polarity_supported" flag to PWMv2 driver Lukasz Majewski
2016-10-24 15:28 ` Boris Brezillon
2016-10-24 15:34 ` Boris Brezillon
2016-10-24 21:14 ` Lukasz Majewski
2016-10-25 6:37 ` Boris Brezillon
2016-10-25 6:58 ` Lukasz Majewski
2016-10-24 15:36 ` [PATCH 0/6] pwm: imx: Provide atomic operation for IMX PWM driver Boris Brezillon
2016-10-24 21:26 ` Lukasz Majewski
2016-10-25 3:41 ` Stefan Agner
2016-10-25 7:07 ` Lukasz Majewski
2016-10-25 17:08 ` Fabio Estevam
2016-10-25 17:09 ` Fabio Estevam
2016-10-27 5:59 ` Lukasz Majewski
2016-12-26 22:55 ` [PATCH v3 RESEND 00/11] " Lukasz Majewski
2016-12-26 22:55 ` [PATCH v3 RESEND 01/11] pwm: print error messages with pr_err() instead of pr_debug() Lukasz Majewski
2016-12-26 22:55 ` [PATCH v3 RESEND 02/11] pwm: imx: remove ipg clock Lukasz Majewski
2016-12-27 7:26 ` Stefan Agner
2016-12-27 7:54 ` Lukasz Majewski
2016-12-28 22:01 ` Lukasz Majewski
2016-12-29 7:22 ` Stefan Agner
2016-12-29 10:06 ` Lukasz Majewski
2016-12-26 22:55 ` [PATCH v3 RESEND 03/11] pwm: imx: Add separate set of pwm ops for PWMv1 and PWMv2 Lukasz Majewski
2016-12-26 22:55 ` [PATCH v3 RESEND 04/11] pwm: imx: Rewrite imx_pwm_*_v1 code to facilitate switch to atomic pwm operation Lukasz Majewski
2016-12-26 22:55 ` [PATCH v3 RESEND 05/11] pwm: imx: Move PWMv2 software reset code to a separate function Lukasz Majewski
2016-12-26 22:55 ` [PATCH v3 RESEND 06/11] pwm: imx: Move PWMv2 wait for fifo slot " Lukasz Majewski
2016-12-26 22:55 ` [PATCH v3 RESEND 07/11] pwm: imx: Provide atomic PWM support for i.MX PWMv2 Lukasz Majewski
2016-12-29 16:21 ` Boris Brezillon
2016-12-29 16:45 ` Lukasz Majewski
2016-12-29 17:08 ` Boris Brezillon
2017-01-03 11:43 ` Lukasz Majewski
2017-01-03 12:46 ` Boris Brezillon
2017-01-03 17:29 ` Stefan Agner
2017-01-03 19:35 ` Boris Brezillon
2017-01-03 22:01 ` Lukasz Majewski
2017-01-03 22:18 ` Boris Brezillon
2017-01-03 22:46 ` Lukasz Majewski
2017-01-03 23:34 ` Boris Brezillon
2017-01-04 11:29 ` Lukasz Majewski
2016-12-26 22:55 ` [PATCH v3 RESEND 08/11] pwm: imx: Remove redundant i.MX PWMv2 code Lukasz Majewski
2016-12-26 22:55 ` Lukasz Majewski [this message]
2016-12-26 22:56 ` [PATCH v3 RESEND 10/11] pwm: imx: doc: Update imx-pwm.txt documentation entry Lukasz Majewski
2016-12-26 22:56 ` [PATCH v3 RESEND 11/11] pwm: imx: Add polarity inversion support to i.MX's PWMv2 Lukasz Majewski
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