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[2003:f1:33dd:a400:d12e:ff43:fed1:e981]) by smtp.googlemail.com with ESMTPSA id c7sm5143345wrp.57.2019.06.08.11.06.36 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Sat, 08 Jun 2019 11:06:36 -0700 (PDT) From: Martin Blumenstingl To: linux-amlogic@lists.infradead.org, linux-pwm@vger.kernel.org, thierry.reding@gmail.com Subject: [PATCH v2 03/14] pwm: meson: use GENMASK and FIELD_PREP for the lo and hi values Date: Sat, 8 Jun 2019 20:06:15 +0200 Message-Id: <20190608180626.30589-4-martin.blumenstingl@googlemail.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190608180626.30589-1-martin.blumenstingl@googlemail.com> References: <20190608180626.30589-1-martin.blumenstingl@googlemail.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190608_110638_478321_CEB44A0D X-CRM114-Status: GOOD ( 11.35 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Martin Blumenstingl , Neil Armstrong , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, u.kleine-koenig@pengutronix.de Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org meson_pwm_calc() ensures that "lo" is always less than 16 bits wide (otherwise it would overflow into the "hi" part of the REG_PWM_{A,B} register). Use GENMASK and FIELD_PREP for the lo and hi values to make it easier to spot how wide these are internally. Additionally this is a preparation step for the .get_state() implementation where the GENMASK() for lo and hi becomes handy because it can be used with FIELD_GET() to extract the values from the register REG_PWM_{A,B} register. No functional changes intended. Signed-off-by: Martin Blumenstingl Reviewed-by: Neil Armstrong --- drivers/pwm/pwm-meson.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c index 35b38c7201c3..c62a3ac924d0 100644 --- a/drivers/pwm/pwm-meson.c +++ b/drivers/pwm/pwm-meson.c @@ -5,6 +5,8 @@ * Copyright (C) 2014 Amlogic, Inc. */ +#include +#include #include #include #include @@ -20,7 +22,8 @@ #define REG_PWM_A 0x0 #define REG_PWM_B 0x4 -#define PWM_HIGH_SHIFT 16 +#define PWM_LOW_MASK GENMASK(15, 0) +#define PWM_HIGH_MASK GENMASK(31, 16) #define REG_MISC_AB 0x8 #define MISC_B_CLK_EN BIT(23) @@ -217,7 +220,8 @@ static void meson_pwm_enable(struct meson_pwm *meson, struct pwm_device *pwm) value |= clk_enable; writel(value, meson->base + REG_MISC_AB); - value = (channel->hi << PWM_HIGH_SHIFT) | channel->lo; + value = FIELD_PREP(PWM_HIGH_MASK, channel->hi) | + FIELD_PREP(PWM_LOW_MASK, channel->lo); writel(value, meson->base + offset); value = readl(meson->base + REG_MISC_AB); -- 2.21.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel