linux-kernel - [PATCH 1/1] clk: bulk: add of_clk_bulk

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Date:   Mon, 11 Sep 2017 15:36:53 +0800
From:   Dong Aisheng <aisheng.dong@....com>
To:     <linux-clk@...r.kernel.org>
CC:     <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <sboyd@...eaurora.org>,
        <mturquette@...libre.com>, <shawnguo@...nel.org>,
        Dong Aisheng <aisheng.dong@....com>,
        Russell King <linux@....linux.org.uk>
Subject: [PATCH 1/1] clk: bulk: add of_clk_bulk_get()

'clock-names' property is optinal in DT, so of_clk_bulk_get() is introduced
here to handle this for DT users without 'clock-names' specified.

Cc: Stephen Boyd <sboyd@...eaurora.org>
Cc: Michael Turquette <mturquette@...libre.com>
Cc: Russell King <linux@....linux.org.uk>
Reported-by: Shawn Guo <shawnguo@...nel.org>
Signed-off-by: Dong Aisheng <aisheng.dong@....com>
---
 drivers/clk/clk-bulk.c | 31 +++++++++++++++++++++++++++++++
 include/linux/clk.h    |  8 ++++++++
 2 files changed, 39 insertions(+)

diff --git a/drivers/clk/clk-bulk.c b/drivers/clk/clk-bulk.c
index c834f5a..3179f28 100644
--- a/drivers/clk/clk-bulk.c
+++ b/drivers/clk/clk-bulk.c
@@ -19,6 +19,37 @@
 #include <linux/clk.h>
 #include <linux/device.h>
 #include <linux/export.h>
+#include <linux/of.h>
+
+#if defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK)
+int __must_check of_clk_bulk_get(struct device_node *np, int num_clks,
+				 struct clk_bulk_data *clks)
+{
+	int ret;
+	int i;
+
+	for (i = 0; i < num_clks; i++)
+		clks[i].clk = NULL;
+
+	for (i = 0; i < num_clks; i++) {
+		clks[i].clk = of_clk_get(np, i);
+		if (IS_ERR(clks[i].clk)) {
+			ret = PTR_ERR(clks[i].clk);
+			pr_err("%s: Failed to get clk index: %d ret: %d\n",
+			       np->full_name, i, ret);
+			clks[i].clk = NULL;
+			goto err;
+		}
+	}
+
+	return 0;
+
+err:
+	clk_bulk_put(i, clks);
+
+	return ret;
+}
+#endif
 
 void clk_bulk_put(int num_clks, struct clk_bulk_data *clks)
 {
diff --git a/include/linux/clk.h b/include/linux/clk.h
index 91bd464..c5281b3 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -658,10 +658,18 @@ static inline void clk_disable_unprepare(struct clk *clk)
 }
 
 #if defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK)
+int __must_check of_clk_bulk_get(struct device_node *np, int num_clks,
+				 struct clk_bulk_data *clks);
 struct clk *of_clk_get(struct device_node *np, int index);
 struct clk *of_clk_get_by_name(struct device_node *np, const char *name);
 struct clk *of_clk_get_from_provider(struct of_phandle_args *clkspec);
 #else
+static int of_clk_bulk_get(struct device_node *np, int num_clks,
+			   struct clk_bulk_data *clks)
+{
+	return ERR_PTR(-ENOENT);
+}
+
 static inline struct clk *of_clk_get(struct device_node *np, int index)
 {
 	return ERR_PTR(-ENOENT);
-- 
2.7.4