linux-kernel - [PATCH v5 1/8] clk: divider: switch to GENMASK()

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Date:	Mon, 13 Jul 2015 17:07:41 +0300
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	linux-kernel@...r.kernel.org, Sascha Hauer <kernel@...gutronix.de>,
	Peter De Schrijver <pdeschrijver@...dia.com>,
	Tero Kristo <t-kristo@...com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Dinh Nguyen <dinguyen@...nsource.altera.com>
Cc:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v5 1/8] clk: divider: switch to GENMASK()

Convert the code to use GENMASK() helper instead of div_mask() macro.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/clk/clk-divider.c | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/drivers/clk/clk-divider.c b/drivers/clk/clk-divider.c
index 706b578..3bde790 100644
--- a/drivers/clk/clk-divider.c
+++ b/drivers/clk/clk-divider.c
@@ -30,8 +30,6 @@
 
 #define to_clk_divider(_hw) container_of(_hw, struct clk_divider, hw)
 
-#define div_mask(width)	((1 << (width)) - 1)
-
 static unsigned int _get_table_maxdiv(const struct clk_div_table *table)
 {
 	unsigned int maxdiv = 0;
@@ -58,12 +56,12 @@ static unsigned int _get_maxdiv(const struct clk_div_table *table, u8 width,
 				unsigned long flags)
 {
 	if (flags & CLK_DIVIDER_ONE_BASED)
-		return div_mask(width);
+		return GENMASK(width - 1, 0);
 	if (flags & CLK_DIVIDER_POWER_OF_TWO)
-		return 1 << div_mask(width);
+		return GENMASK(width - 1, 0);
 	if (table)
 		return _get_table_maxdiv(table);
-	return div_mask(width) + 1;
+	return BIT(width);
 }
 
 static unsigned int _get_table_div(const struct clk_div_table *table,
@@ -138,7 +136,7 @@ static unsigned long clk_divider_recalc_rate(struct clk_hw *hw,
 	unsigned int val;
 
 	val = clk_readl(divider->reg) >> divider->shift;
-	val &= div_mask(divider->width);
+	val &= GENMASK(divider->width - 1, 0);
 
 	return divider_recalc_rate(hw, parent_rate, val, divider->table,
 				   divider->flags);
@@ -350,7 +348,7 @@ static long clk_divider_round_rate(struct clk_hw *hw, unsigned long rate,
 	/* if read only, just return current value */
 	if (divider->flags & CLK_DIVIDER_READ_ONLY) {
 		bestdiv = readl(divider->reg) >> divider->shift;
-		bestdiv &= div_mask(divider->width);
+		bestdiv &= GENMASK(divider->width - 1, 0);
 		bestdiv = _get_div(divider->table, bestdiv, divider->flags);
 		return DIV_ROUND_UP(*prate, bestdiv);
 	}
@@ -372,7 +370,7 @@ int divider_get_val(unsigned long rate, unsigned long parent_rate,
 
 	value = _get_val(table, div, flags);
 
-	return min_t(unsigned int, value, div_mask(width));
+	return min_t(unsigned int, value, GENMASK(width - 1, 0));
 }
 EXPORT_SYMBOL_GPL(divider_get_val);
 
@@ -391,10 +389,10 @@ static int clk_divider_set_rate(struct clk_hw *hw, unsigned long rate,
 		spin_lock_irqsave(divider->lock, flags);
 
 	if (divider->flags & CLK_DIVIDER_HIWORD_MASK) {
-		val = div_mask(divider->width) << (divider->shift + 16);
+		val = GENMASK(divider->width - 1, 0) << (divider->shift + 16);
 	} else {
 		val = clk_readl(divider->reg);
-		val &= ~(div_mask(divider->width) << divider->shift);
+		val &= ~(GENMASK(divider->width - 1, 0) << divider->shift);
 	}
 	val |= value << divider->shift;
 	clk_writel(val, divider->reg);
-- 
2.1.4

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