linux-kernel - [PATCH 14/33] clk: vc5: change vc5_mux_round

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Message-Id: <1514596392-22270-15-git-send-email-pure.logic@nexus-software.ie>
Date:   Sat, 30 Dec 2017 01:12:53 +0000
From:   Bryan O'Donoghue <pure.logic@...us-software.ie>
To:     mturquette@...libre.com, sboyd@...eaurora.org,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org
Cc:     pure.logic@...us-software.ie, Marek Vasut <marek.vasut@...il.com>,
        Vladimir Barinov <vladimir.barinov+renesas@...entembedded.com>,
        Alexey Firago <alexey_firago@...tor.com>
Subject: [PATCH 14/33] clk: vc5: change vc5_mux_round_rate() return logic

This patch updates the round_rate() logic here to return zero instead of a
negative number on error.

In conjunction with higher-level changes associated with acting on the
return value of clk_ops->round_rate() it is then possible to have
clk_ops->round_rate() return values from 1 Hz to ULONG_MAX Hz instead of
the current limitation of 1 Hz to LONG_MAX Hz.

Signed-off-by: Bryan O'Donoghue <pure.logic@...us-software.ie>
Cc: Marek Vasut <marek.vasut@...il.com>
Cc: Michael Turquette <mturquette@...libre.com>
Cc: Stephen Boyd <sboyd@...eaurora.org>
Cc: linux-clk@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Cc: Vladimir Barinov <vladimir.barinov+renesas@...entembedded.com>
Cc: Alexey Firago <alexey_firago@...tor.com>
---
 drivers/clk/clk-versaclock5.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/clk-versaclock5.c b/drivers/clk/clk-versaclock5.c
index 2b8ea89..5e8a050 100644
--- a/drivers/clk/clk-versaclock5.c
+++ b/drivers/clk/clk-versaclock5.c
@@ -351,7 +351,7 @@ static unsigned long vc5_pfd_round_rate(struct clk_hw *hw, unsigned long rate,
 
 	/* PLL cannot operate with input clock above 50 MHz. */
 	if (rate > 50000000)
-		return -EINVAL;
+		return 0;
 
 	/* CLKIN within range of PLL input, feed directly to PLL. */
 	if (*parent_rate <= 50000000)
@@ -359,7 +359,7 @@ static unsigned long vc5_pfd_round_rate(struct clk_hw *hw, unsigned long rate,
 
 	idiv = DIV_ROUND_UP(*parent_rate, rate);
 	if (idiv > 127)
-		return -EINVAL;
+		return 0;
 
 	return *parent_rate / idiv;
 }
-- 
2.7.4