linux-kernel - [PATCH v2] clk: hisilicon: Remove unnecessary local variable

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Message-ID: <20240801103616.20430-1-thorsten.blum@toblux.com>
Date: Thu,  1 Aug 2024 12:36:16 +0200
From: Thorsten Blum <thorsten.blum@...lux.com>
To: mturquette@...libre.com,
	sboyd@...nel.org,
	erick.archer@....com,
	gustavoars@...nel.org,
	u.kleine-koenig@...gutronix.de,
	christophe.jaillet@...adoo.fr
Cc: linux-clk@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Thorsten Blum <thorsten.blum@...lux.com>
Subject: [PATCH v2] clk: hisilicon: Remove unnecessary local variable

The local u64 variable refdiv_val has the same value as the local u32
variable val and can be removed. Remove it and use val directly as the
divisor to also remove the following Coccinelle/coccicheck warning
reported by do_div.cocci:

  WARNING: do_div() does a 64-by-32 division, please consider using div64_u64 instead

Use the preferred div_u64() function instead of the do_div() macro.

Signed-off-by: Thorsten Blum <thorsten.blum@...lux.com>
---
Changes in v2:
- Use div_u64() instead of do_div() as suggested by Stephen Boyd
- Link to v1: https://lore.kernel.org/linux-kernel/20240710201844.710365-2-thorsten.blum@toblux.com/
---
 drivers/clk/hisilicon/clk-hi3559a.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/clk/hisilicon/clk-hi3559a.c b/drivers/clk/hisilicon/clk-hi3559a.c
index c79a94f6d9d2..8646e9d352ed 100644
--- a/drivers/clk/hisilicon/clk-hi3559a.c
+++ b/drivers/clk/hisilicon/clk-hi3559a.c
@@ -407,7 +407,7 @@ static unsigned long clk_pll_recalc_rate(struct clk_hw *hw,
 		unsigned long parent_rate)
 {
 	struct hi3559av100_clk_pll *clk = to_pll_clk(hw);
-	u64 frac_val, fbdiv_val, refdiv_val;
+	u64 frac_val, fbdiv_val;
 	u32 postdiv1_val, postdiv2_val;
 	u32 val;
 	u64 tmp, rate;
@@ -435,14 +435,13 @@ static unsigned long clk_pll_recalc_rate(struct clk_hw *hw,
 	val = readl_relaxed(clk->ctrl_reg2);
 	val = val >> clk->refdiv_shift;
 	val &= ((1 << clk->refdiv_width) - 1);
-	refdiv_val = val;
 
 	/* rate = 24000000 * (fbdiv + frac / (1<<24) ) / refdiv  */
 	rate = 0;
 	tmp = 24000000 * fbdiv_val + (24000000 * frac_val) / (1 << 24);
 	rate += tmp;
-	do_div(rate, refdiv_val);
-	do_div(rate, postdiv1_val * postdiv2_val);
+	rate = div_u64(rate, val);
+	rate = div_u64(rate, postdiv1_val * postdiv2_val);
 
 	return rate;
 }
-- 
2.45.2