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From: "Uwe Kleine-König" <uwe@kleine-koenig.org>
To: Claudiu Beznea <claudiu.beznea@microchip.com>,
	Thierry Reding <thierry.reding@gmail.com>
Cc: linux-pwm@vger.kernel.org,
	Alexandre Belloni <alexandre.belloni@bootlin.com>,
	Ludovic Desroches <ludovic.desroches@microchip.com>,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH 2/3] pwm: atmel: use a constant for maximum prescale value
Date: Thu, 15 Aug 2019 23:41:32 +0200
Message-ID: <20190815214133.11134-2-uwe@kleine-koenig.org> (raw)
In-Reply-To: <20190815214133.11134-1-uwe@kleine-koenig.org>

The maximal prescale value is 10 for all supported variants. So drop the
member in the variant description and introduce a global constant instead.

This reduces the size of the variant descriptions and the .apply() callback
can be compiled a bit more effectively.

Signed-off-by: Uwe Kleine-König <uwe@kleine-koenig.org>
---
 drivers/pwm/pwm-atmel.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/pwm/pwm-atmel.c b/drivers/pwm/pwm-atmel.c
index ac3d7a200b9e..d7a6d32b5774 100644
--- a/drivers/pwm/pwm-atmel.c
+++ b/drivers/pwm/pwm-atmel.c
@@ -50,6 +50,8 @@
 #define PWMV2_CPRD		0x0C
 #define PWMV2_CPRDUPD		0x10
 
+#define PWM_MAX_PRES		10
+
 struct atmel_pwm_registers {
 	u8 period;
 	u8 period_upd;
@@ -59,7 +61,6 @@ struct atmel_pwm_registers {
 
 struct atmel_pwm_config {
 	u32 max_period;
-	u32 max_pres;
 };
 
 struct atmel_pwm_data {
@@ -126,7 +127,7 @@ static int atmel_pwm_calculate_cprd_and_pres(struct pwm_chip *chip,
 	for (*pres = 0; cycles > atmel_pwm->data->cfg.max_period; cycles >>= 1)
 		(*pres)++;
 
-	if (*pres > atmel_pwm->data->cfg.max_pres) {
+	if (*pres > PWM_MAX_PRES) {
 		dev_err(chip->dev, "pres exceeds the maximum value\n");
 		return -EINVAL;
 	}
@@ -289,7 +290,6 @@ static const struct atmel_pwm_data atmel_sam9rl_pwm_data = {
 	.cfg = {
 		/* 16 bits to keep period and duty. */
 		.max_period	= 0xffff,
-		.max_pres	= 10,
 	},
 };
 
@@ -303,7 +303,6 @@ static const struct atmel_pwm_data atmel_sama5_pwm_data = {
 	.cfg = {
 		/* 16 bits to keep period and duty. */
 		.max_period	= 0xffff,
-		.max_pres	= 10,
 	},
 };
 
@@ -317,7 +316,6 @@ static const struct atmel_pwm_data mchp_sam9x60_pwm_data = {
 	.cfg = {
 		/* 32 bits to keep period and duty. */
 		.max_period	= 0xffffffff,
-		.max_pres	= 10,
 	},
 };
 
-- 
2.20.1


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Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-15 21:41 [PATCH 1/3] pwm: atmel: Add link to reference manual Uwe Kleine-König
2019-08-15 21:41 ` Uwe Kleine-König [this message]
2019-08-19  9:27   ` [PATCH 2/3] pwm: atmel: use a constant for maximum prescale value Claudiu.Beznea
2019-08-15 21:41 ` [PATCH 3/3] pwm: atmel: replace loop in prescale calculation by ad-hoc calculation Uwe Kleine-König
2019-08-19  9:27   ` Claudiu.Beznea
2019-08-16  9:37 ` [PATCH 4/3] pwm: atmel: document known weaknesses of both hardware and software Uwe Kleine-König
2019-08-16 20:43   ` Alexandre Belloni
2019-08-19  8:10     ` Uwe Kleine-König
2019-08-19  9:26   ` Claudiu.Beznea
2019-08-19 10:46     ` Uwe Kleine-König
2019-08-19 12:28       ` Claudiu.Beznea
2019-08-19 15:20         ` Uwe Kleine-König
2019-08-19  9:26 ` [PATCH 1/3] pwm: atmel: Add link to reference manual Claudiu.Beznea
2019-08-19  9:46   ` Nicolas.Ferre

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