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| author | Martin Blumenstingl <martin.blumenstingl@googlemail.com> | 2019-06-12 21:59:00 +0200 |
|---|---|---|
| committer | Thierry Reding <thierry.reding@gmail.com> | 2019-06-26 11:39:07 +0200 |
| commit | 181164b669c91eccafa2d276ac32873310dec465 (patch) | |
| tree | 07e657d032927240978e65c528678060238279f0 /drivers/pwm | |
| parent | ba4004c715c906474ae84f1f9a97f55d3259c6bd (diff) | |
| download | linux-181164b669c91eccafa2d276ac32873310dec465.tar.gz linux-181164b669c91eccafa2d276ac32873310dec465.tar.bz2 linux-181164b669c91eccafa2d276ac32873310dec465.zip | |
pwm: meson: Use GENMASK and FIELD_PREP for the lo and hi values
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.
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'drivers/pwm')
| -rw-r--r-- | drivers/pwm/pwm-meson.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c index 8b277a2212e2..ec4407ec174d 100644 --- a/drivers/pwm/pwm-meson.c +++ b/drivers/pwm/pwm-meson.c @@ -5,6 +5,8 @@ * Copyright (C) 2014 Amlogic, Inc. */ +#include <linux/bitfield.h> +#include <linux/bits.h> #include <linux/clk.h> #include <linux/clk-provider.h> #include <linux/err.h> @@ -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); |