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Received: from esa2.microchip.iphmx.com ([68.232.149.84]) by casper.infradead.org with esmtps (Exim 4.89 #1 (Red Hat Linux)) id 1ea0G7-0001Qf-A8; Fri, 12 Jan 2018 14:24:42 +0000 X-IronPort-AV: E=Sophos;i="5.46,349,1511852400"; d="scan'208";a="10394904" Received: from exsmtp03.microchip.com (HELO email.microchip.com) ([198.175.253.49]) by esa2.microchip.iphmx.com with ESMTP/TLS/DHE-RSA-AES256-SHA; 12 Jan 2018 07:24:23 -0700 Received: from m18063-ThinkPad-T460p.microchip.com (10.10.76.4) by chn-sv-exch03.mchp-main.com (10.10.76.49) with Microsoft SMTP Server id 14.3.352.0; Fri, 12 Jan 2018 07:24:23 -0700 From: Claudiu Beznea To: , , , , , , , , , Subject: [PATCH v2 13/16] drivers: pwm: core: add push-pull mode support Date: Fri, 12 Jan 2018 16:23:00 +0200 Message-ID: <1515766983-15151-14-git-send-email-claudiu.beznea@microchip.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1515766983-15151-1-git-send-email-claudiu.beznea@microchip.com> References: <1515766983-15151-1-git-send-email-claudiu.beznea@microchip.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20180112_142439_662813_63F97E92 X-CRM114-Status: GOOD ( 10.69 ) X-BeenThere: linux-amlogic@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-pwm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-rpi-kernel@lists.infradead.org, linux-amlogic@lists.infradead.org, Claudiu Beznea , linux-arm-kernel@lists.infradead.org Sender: "linux-amlogic" Errors-To: linux-amlogic-bounces+patchwork-linux-amlogic=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Add push-pull mode support in PWM code. In push-pull mode the channels outputs has same polarity and the edges are complementary delayed for one period. Signed-off-by: Claudiu Beznea --- drivers/pwm/sysfs.c | 2 ++ include/linux/pwm.h | 9 +++++++-- 2 files changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/pwm/sysfs.c b/drivers/pwm/sysfs.c index 7d111ab17e43..5052bdec7ad6 100644 --- a/drivers/pwm/sysfs.c +++ b/drivers/pwm/sysfs.c @@ -249,6 +249,8 @@ static ssize_t mode_store(struct device *child, mode = PWM_MODE_NORMAL; else if (sysfs_streq(buf, pwm_get_mode_desc(PWM_MODE_COMPLEMENTARY))) mode = PWM_MODE_COMPLEMENTARY; + else if (sysfs_streq(buf, pwm_get_mode_desc(PWM_MODE_PUSH_PULL))) + mode = PWM_MODE_PUSH_PULL; else return -EINVAL; diff --git a/include/linux/pwm.h b/include/linux/pwm.h index 2e8dfc3ea516..a4ad3b7a5317 100644 --- a/include/linux/pwm.h +++ b/include/linux/pwm.h @@ -29,13 +29,16 @@ enum pwm_polarity { * enum pwm_mode - PWM working modes * PWM_MODE_NORMAL: PWM has one output per channel * PWM_MODE_COMPLEMENTARY: PWM has 2 outputs per channel with opposite polarity + * PWM_MODE_PUSH_PULL: PWM has 2 outputs per channel with same polarity and + * the edges are complementary delayed for one period * PWM_MODE_MAX: Used to get the defined PWM modes mask (PWM_MODE_MAX - 1) * phase-shifted */ enum pwm_mode { PWM_MODE_NORMAL = BIT(0), PWM_MODE_COMPLEMENTARY = BIT(1), - PWM_MODE_MAX = BIT(2), + PWM_MODE_PUSH_PULL = BIT(2), + PWM_MODE_MAX = BIT(3), }; /** @@ -478,7 +481,9 @@ static inline void pwm_disable(struct pwm_device *pwm) static inline const char * const pwm_get_mode_desc(enum pwm_mode mode) { - static const char * const modes[] = { "normal", "complementary" }; + static const char * const modes[] = { + "normal", "complementary", "push-pull" + }; return mode ? modes[ffs(mode) - 1] : "invalid"; }