linux-kernel - [PATCH] clk: clk-fixed-factor: Clear OF

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Date:   Tue, 17 Jul 2018 06:17:00 -0700
From:   Rajan Vaja <rajan.vaja@...inx.com>
To:     <mturquette@...libre.com>, <sboyd@...nel.org>
CC:     <linux-clk@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Rajan Vaja <rajan.vaja@...inx.com>
Subject: [PATCH] clk: clk-fixed-factor: Clear OF_POPULATED flag in case of failure

Fixed factor clock has two initializations at of_clk_init() time
and during platform driver probe. Before of_clk_init() call,
node is marked as populated and so its probe never gets called.

During of_clk_init() fixed factor clock registration may fail if
any of its parent clock is not registered. In this case, it doesn't
get chance to retry registration from probe. Clear OF_POPULATED
flag if fixed factor clock registration fails so that clock
registration is attempted again from probe.

Signed-off-by: Rajan Vaja <rajan.vaja@...inx.com>
---
 drivers/clk/clk-fixed-factor.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/clk-fixed-factor.c b/drivers/clk/clk-fixed-factor.c
index d72ef2d..f3ae4ff 100644
--- a/drivers/clk/clk-fixed-factor.c
+++ b/drivers/clk/clk-fixed-factor.c
@@ -177,8 +177,15 @@ static struct clk *_of_fixed_factor_clk_setup(struct device_node *node)

        clk = clk_register_fixed_factor(NULL, clk_name, parent_name, flags,
                                        mult, div);
-       if (IS_ERR(clk))
+       if (IS_ERR(clk)) {
+               /*
+                * If parent clock is not registered, registration would fail.
+                * Clear OF_POPULATED flag so that clock registration can be
+                * attempted again from probe function.
+                */
+               of_node_clear_flag(node, OF_POPULATED);
                return clk;
+       }

        ret = of_clk_add_provider(node, of_clk_src_simple_get, clk);
        if (ret) {
--
2.7.4

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