[PATCH v2 04/14] clk: imx: pfdv2: switch to use determine_rate

From: peng.fan@nxp.com
To: shawnguo@kernel.org, s.hauer@pengutronix.de, sboyd@kernel.org,
	robh+dt@kernel.org, viresh.kumar@linaro.org, rjw@rjwysocki.net
Cc: kernel@pengutronix.de, festevam@gmail.com, linux-imx@nxp.com,
	Anson.Huang@nxp.com, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, abel.vesa@nxp.com,
	Peng Fan <peng.fan@nxp.com>
Subject: [PATCH v2 04/14] clk: imx: pfdv2: switch to use determine_rate
Date: Wed, 19 Feb 2020 15:59:47 +0800	[thread overview]
Message-ID: <1582099197-20327-5-git-send-email-peng.fan@nxp.com> (raw)
In-Reply-To: <1582099197-20327-1-git-send-email-peng.fan@nxp.com>

From: Peng Fan <peng.fan@nxp.com>

Per clk_ops, compared with round_rate, determine_rate could optionally
support the parent clock that should be used to provide the clock rate.

In this patch, the parent clock is just parent->rate as round_rate.

The following patch will calculate the best parent clock.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
 drivers/clk/imx/clk-pfdv2.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/clk/imx/clk-pfdv2.c b/drivers/clk/imx/clk-pfdv2.c
index f8707278aad9..28b5f208ced9 100644
--- a/drivers/clk/imx/clk-pfdv2.c
+++ b/drivers/clk/imx/clk-pfdv2.c
@@ -98,10 +98,11 @@ static unsigned long clk_pfdv2_recalc_rate(struct clk_hw *hw,
 	return tmp;
 }
 
-static long clk_pfdv2_round_rate(struct clk_hw *hw, unsigned long rate,
-				 unsigned long *prate)
+static int clk_pfdv2_determine_rate(struct clk_hw *hw,
+				    struct clk_rate_request *req)
 {
-	u64 tmp = *prate;
+	u64 tmp = req->best_parent_rate;
+	u64 rate = req->rate;
 	u8 frac;
 
 	tmp = tmp * 18 + rate / 2;
@@ -113,11 +114,13 @@ static long clk_pfdv2_round_rate(struct clk_hw *hw, unsigned long rate,
 	else if (frac > 35)
 		frac = 35;
 
-	tmp = *prate;
+	tmp = req->best_parent_rate;
 	tmp *= 18;
 	do_div(tmp, frac);
 
-	return tmp;
+	req->rate = tmp;
+
+	return 0;
 }
 
 static int clk_pfdv2_is_enabled(struct clk_hw *hw)
@@ -167,7 +170,7 @@ static const struct clk_ops clk_pfdv2_ops = {
 	.enable		= clk_pfdv2_enable,
 	.disable	= clk_pfdv2_disable,
 	.recalc_rate	= clk_pfdv2_recalc_rate,
-	.round_rate	= clk_pfdv2_round_rate,
+	.determine_rate	= clk_pfdv2_determine_rate,
 	.set_rate	= clk_pfdv2_set_rate,
 	.is_enabled     = clk_pfdv2_is_enabled,
 };
-- 
2.16.4

