linux-kernel - [PATCH AUTOSEL for 4.14 31/84] clk: ti: clkctrl: add support for retrying failed init

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Message-ID: <20180303222518.26271-31-alexander.levin@microsoft.com>
Date:   Sat, 3 Mar 2018 22:26:17 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Tero Kristo <t-kristo@...com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.14 31/84] clk: ti: clkctrl: add support for
 retrying failed init

From: Tero Kristo <t-kristo@...com>

[ Upstream commit 729e13bf58e643b9accd2a14c55b555958702fb0 ]

In case the clkctrl node contains assigned-clock-* entries, registering
the provider can fail with -EPROBE_DEFER. In this case, add the
provider to the retry_init clock list so it will be cleaned up later.

Signed-off-by: Tero Kristo <t-kristo@...com>
Acked-by: Stephen Boyd <sboyd@...eaurora.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/clk/ti/clkctrl.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/ti/clkctrl.c b/drivers/clk/ti/clkctrl.c
index 53e71d0503ec..e7c51bea97f7 100644
--- a/drivers/clk/ti/clkctrl.c
+++ b/drivers/clk/ti/clkctrl.c
@@ -400,6 +400,12 @@ _ti_clkctrl_setup_subclks(struct omap_clkctrl_provider *provider,
 	}
 }
 
+static void __init _clkctrl_add_provider(void *data,
+					 struct device_node *np)
+{
+	of_clk_add_hw_provider(np, _ti_omap4_clkctrl_xlate, data);
+}
+
 static void __init _ti_omap4_clkctrl_setup(struct device_node *node)
 {
 	struct omap_clkctrl_provider *provider;
@@ -411,6 +417,7 @@ static void __init _ti_omap4_clkctrl_setup(struct device_node *node)
 	struct omap_clkctrl_clk *clkctrl_clk;
 	const __be32 *addrp;
 	u32 addr;
+	int ret;
 
 	addrp = of_get_address(node, 0, NULL, NULL);
 	addr = (u32)of_translate_address(node, addrp);
@@ -485,7 +492,10 @@ static void __init _ti_omap4_clkctrl_setup(struct device_node *node)
 		reg_data++;
 	}
 
-	of_clk_add_hw_provider(node, _ti_omap4_clkctrl_xlate, provider);
+	ret = of_clk_add_hw_provider(node, _ti_omap4_clkctrl_xlate, provider);
+	if (ret == -EPROBE_DEFER)
+		ti_clk_retry_init(node, provider, _clkctrl_add_provider);
+
 	return;
 
 cleanup:
-- 
2.14.1