linux-kernel - [PATCH v4 1/2] phy: rockchip-inno-usb2: correct clk

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Message-Id: <1479182047-3399-2-git-send-email-wulf@rock-chips.com>
Date:   Tue, 15 Nov 2016 11:54:06 +0800
From:   William Wu <wulf@...k-chips.com>
To:     kishon@...com, heiko@...ech.de
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, devicetree@...r.kernel.org,
        robh+dt@...nel.org, frank.wang@...k-chips.com,
        huangtao@...k-chips.com, dianders@...gle.com,
        briannorris@...gle.com, groeck@...gle.com, wulf@...k-chips.com
Subject: [PATCH v4 1/2] phy: rockchip-inno-usb2: correct clk_ops callback

Since we needs to delay ~1ms to wait for 480MHz output clock
of USB2 PHY to become stable after turn on it, the delay time
is pretty long for something that's supposed to be "atomic"
like a clk_enable(). Consider that clk_enable() will disable
interrupt and that a 1ms interrupt latency is not sensible.

The 480MHz output clock should be handled in prepare callbacks
which support gate a clk if the operation may sleep.

Signed-off-by: William Wu <wulf@...k-chips.com>
Reviewed-by: Douglas Anderson <dianders@...omium.org>
---
Changes in v4:
- add Reviewed-by

Changes in v3:
- None

Changes in v2:
- None

 drivers/phy/phy-rockchip-inno-usb2.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/phy/phy-rockchip-inno-usb2.c b/drivers/phy/phy-rockchip-inno-usb2.c
index ac20310..365e077 100644
--- a/drivers/phy/phy-rockchip-inno-usb2.c
+++ b/drivers/phy/phy-rockchip-inno-usb2.c
@@ -153,7 +153,7 @@ static inline bool property_enabled(struct rockchip_usb2phy *rphy,
 	return tmp == reg->enable;
 }
 
-static int rockchip_usb2phy_clk480m_enable(struct clk_hw *hw)
+static int rockchip_usb2phy_clk480m_prepare(struct clk_hw *hw)
 {
 	struct rockchip_usb2phy *rphy =
 		container_of(hw, struct rockchip_usb2phy, clk480m_hw);
@@ -172,7 +172,7 @@ static int rockchip_usb2phy_clk480m_enable(struct clk_hw *hw)
 	return 0;
 }
 
-static void rockchip_usb2phy_clk480m_disable(struct clk_hw *hw)
+static void rockchip_usb2phy_clk480m_unprepare(struct clk_hw *hw)
 {
 	struct rockchip_usb2phy *rphy =
 		container_of(hw, struct rockchip_usb2phy, clk480m_hw);
@@ -181,7 +181,7 @@ static void rockchip_usb2phy_clk480m_disable(struct clk_hw *hw)
 	property_enable(rphy, &rphy->phy_cfg->clkout_ctl, false);
 }
 
-static int rockchip_usb2phy_clk480m_enabled(struct clk_hw *hw)
+static int rockchip_usb2phy_clk480m_prepared(struct clk_hw *hw)
 {
 	struct rockchip_usb2phy *rphy =
 		container_of(hw, struct rockchip_usb2phy, clk480m_hw);
@@ -197,9 +197,9 @@ rockchip_usb2phy_clk480m_recalc_rate(struct clk_hw *hw,
 }
 
 static const struct clk_ops rockchip_usb2phy_clkout_ops = {
-	.enable = rockchip_usb2phy_clk480m_enable,
-	.disable = rockchip_usb2phy_clk480m_disable,
-	.is_enabled = rockchip_usb2phy_clk480m_enabled,
+	.prepare = rockchip_usb2phy_clk480m_prepare,
+	.unprepare = rockchip_usb2phy_clk480m_unprepare,
+	.is_prepared = rockchip_usb2phy_clk480m_prepared,
 	.recalc_rate = rockchip_usb2phy_clk480m_recalc_rate,
 };
 
-- 
2.0.0