linux-kernel - [PATCH v2 4/4] phy: qcom-qmp: Expose provided clocks to DT

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Date:   Mon, 10 Dec 2018 11:32:07 -0800
From:   Evan Green <evgreen@...omium.org>
To:     Kishon Vijay Abraham I <kishon@...com>,
        Andy Gross <andy.gross@...aro.org>
Cc:     Douglas Anderson <dianders@...omium.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Evan Green <evgreen@...omium.org>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Can Guo <cang@...eaurora.org>, linux-kernel@...r.kernel.org,
        Vivek Gautam <vivek.gautam@...eaurora.org>,
        Manu Gautam <mgautam@...eaurora.org>
Subject: [PATCH v2 4/4] phy: qcom-qmp: Expose provided clocks to DT

Register a simple clock provider for the PHY pipe clock sources so that
device tree users can point at these clocks via phandles to the lane
nodes.

Signed-off-by: Evan Green <evgreen@...omium.org>
Reviewed-by: Stephen Boyd <swboyd@...omium.org>
Tested-by: Vivek Gautam <vivek.gautam@...eaurora.org>

---

Changes in v2:
 - Rebased onto phy/next

 drivers/phy/qualcomm/phy-qcom-qmp.c | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c b/drivers/phy/qualcomm/phy-qcom-qmp.c
index 8204d55e2d650..b4006818e1b65 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp.c
@@ -1542,6 +1542,11 @@ static int qcom_qmp_phy_clk_init(struct device *dev)
 	return devm_clk_bulk_get(dev, num, qmp->clks);
 }
 
+static void phy_pipe_clk_release_provider(void *res)
+{
+	of_clk_del_provider(res);
+}
+
 /*
  * Register a fixed rate pipe clock.
  *
@@ -1588,7 +1593,23 @@ static int phy_pipe_clk_register(struct qcom_qmp *qmp, struct device_node *np)
 	fixed->fixed_rate = 125000000;
 	fixed->hw.init = &init;
 
-	return devm_clk_hw_register(qmp->dev, &fixed->hw);
+	ret = devm_clk_hw_register(qmp->dev, &fixed->hw);
+	if (ret)
+		return ret;
+
+	ret = of_clk_add_hw_provider(np, of_clk_hw_simple_get, &fixed->hw);
+	if (ret)
+		return ret;
+
+	/*
+	 * Roll a devm action because the clock provider is the child node, but
+	 * the child node is not actually a device.
+	 */
+	ret = devm_add_action(qmp->dev, phy_pipe_clk_release_provider, np);
+	if (ret)
+		phy_pipe_clk_release_provider(np);
+
+	return ret;
 }
 
 static const struct phy_ops qcom_qmp_phy_gen_ops = {
-- 
2.18.1