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Message-Id: <680a4c737950f59e787f64887402e3ae247e89dd.1641868274.git.mirq-linux@rere.qmqm.pl>
Date: Tue, 11 Jan 2022 03:32:40 +0100
From: Michał Mirosław <mirq-linux@...e.qmqm.pl>
To: Sebastian Reichel <sre@...nel.org>
Cc: linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] power: supply: ltc2941: simplify Qlsb calculation
Replace two divisions with a subtraction+shift for a small code size
improvement and less brackets.
Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
---
drivers/power/supply/ltc2941-battery-gauge.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/power/supply/ltc2941-battery-gauge.c b/drivers/power/supply/ltc2941-battery-gauge.c
index 09f3e78af4e0..c0cbf4cd59ee 100644
--- a/drivers/power/supply/ltc2941-battery-gauge.c
+++ b/drivers/power/supply/ltc2941-battery-gauge.c
@@ -490,13 +490,13 @@ static int ltc294x_i2c_probe(struct i2c_client *client,
if (info->id == LTC2943_ID) {
if (prescaler_exp > LTC2943_MAX_PRESCALER_EXP)
prescaler_exp = LTC2943_MAX_PRESCALER_EXP;
- info->Qlsb = ((340 * 50000) / r_sense) /
- (4096 / (1 << (2*prescaler_exp)));
+ info->Qlsb = ((340 * 50000) / r_sense) >>
+ (12 - 2*prescaler_exp);
} else {
if (prescaler_exp > LTC2941_MAX_PRESCALER_EXP)
prescaler_exp = LTC2941_MAX_PRESCALER_EXP;
- info->Qlsb = ((85 * 50000) / r_sense) /
- (128 / (1 << prescaler_exp));
+ info->Qlsb = ((85 * 50000) / r_sense) >>
+ (7 - prescaler_exp);
}
/* Read status register to check for LTC2942 */
--
2.30.2
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