From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Date: Fri, 15 Nov 2019 08:49:30 +0000 (+0200)
Subject: mfd: syscon: Re-use resource_size() to count max_register
X-Git-Tag: v5.10.7~3314^2~27
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f2a19c5b78670af5986ab0a625631f8f8a6adac1;p=platform%2Fkernel%2Flinux-rpi.git

mfd: syscon: Re-use resource_size() to count max_register

Instead of open coded variant use resource_size() and replace
weird '- 3' to more understandable '- 4'.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
---

diff --git a/drivers/mfd/syscon.c b/drivers/mfd/syscon.c
index e22197c..13626bb 100644
--- a/drivers/mfd/syscon.c
+++ b/drivers/mfd/syscon.c
@@ -245,7 +245,7 @@ static int syscon_probe(struct platform_device *pdev)
 	if (!base)
 		return -ENOMEM;
 
-	syscon_config.max_register = res->end - res->start - 3;
+	syscon_config.max_register = resource_size(res) - 4;
 	if (pdata)
 		syscon_config.name = pdata->label;
 	syscon->regmap = devm_regmap_init_mmio(dev, base, &syscon_config);