[PATCH V2 0/4] clk: new APIs to handle all available clocks

[PATCH V2 0/4] clk: new APIs to handle all available clocks

[Dong Aisheng]

This patch series is a continue of discussion from here,
https://patchwork.kernel.org/patch/9986293/
that some users may want to handle all available clocks from device
tree without need to know the detailed clock information likes clock
numbers and names. This is useful in writing some generic drivers to
handle clock part.

Note:
This patch series is tested on MX6Q SDB cpufreq driver with a minor change
to switch to use clk_bulk_get_all.
But patch 4 only test compiling. Hopefully someone could help test
the function.

v1->v2:
 * add clk_bulk_{get|put}_all() which only supports DT platform currently
 * remove _all variants and the wrapper struct clk_bulk
 * make of_clk_bulk_get and of_clk_bulk_get_all private until someone
   proves they need it because they don't have a struct device pointer.

Dong Aisheng (4):
  clk: bulk: add of_clk_bulk_get()
  clk: add new APIs to operate on all available clocks
  clk: add managed version of clk_bulk_get_all
  video: simplefb: switch to use clk_bulk API to simplify clock
    operations

 drivers/clk/clk-bulk.c         | 89 ++++++++++++++++++++++++++++++++++++++++++
 drivers/clk/clk-devres.c       | 24 ++++++++++++
 drivers/video/fbdev/simplefb.c | 69 ++++++--------------------------
 include/linux/clk.h            | 65 +++++++++++++++++++++++++++++-
 4 files changed, 190 insertions(+), 57 deletions(-)

-- 
2.7.4

[PATCH V2 1/4] clk: bulk: add of_clk_bulk_get()

[Dong Aisheng]

'clock-names' property is optional in DT, so of_clk_bulk_get() is
introduced here to handle this for DT users without 'clock-names'
specified. Later clk_bulk_get_all() will be implemented on top of
it and this API will be kept private until someone proves they need
it because they don't have a struct device pointer.

Cc: Stephen Boyd <sboyd@codeaurora.org>
Cc: Michael Turquette <mturquette@baylibre.com>
Cc: Russell King <linux@arm.linux.org.uk>
Reported-by: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
---
 drivers/clk/clk-bulk.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/drivers/clk/clk-bulk.c b/drivers/clk/clk-bulk.c
index 4c10456..4b357b2 100644
--- a/drivers/clk/clk-bulk.c
+++ b/drivers/clk/clk-bulk.c
@@ -19,6 +19,38 @@
 #include <linux/clk.h>
 #include <linux/device.h>
 #include <linux/export.h>
+#include <linux/of.h>
+
+#if defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK)
+static 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("%pOF: Failed to get clk index: %d ret: %d\n",
+			       np, i, ret);
+			clks[i].clk = NULL;
+			goto err;
+		}
+	}
+
+	return 0;
+
+err:
+	clk_bulk_put(i, clks);
+
+	return ret;
+}
+EXPORT_SYMBOL(of_clk_bulk_get);
+#endif
 
 void clk_bulk_put(int num_clks, struct clk_bulk_data *clks)
 {
-- 
2.7.4

[PATCH V2 2/4] clk: add new APIs to operate on all available clocks

[Dong Aisheng]

This patch introduces of_clk_bulk_get_all and clk_bulk_x_all APIs
to users who just want to handle all available clocks from device tree
without need to know the detailed clock information likes clock numbers
and names. This is useful in writing some generic drivers to handle clock
part.

Cc: Stephen Boyd <sboyd@codeaurora.org>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
---
v1->v2:
 * make of_clk_bulk_get_all private
 * add clk_bulk_get/put_all
---
 drivers/clk/clk-bulk.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++++++
 include/linux/clk.h    | 42 ++++++++++++++++++++++++++++++++++++-
 2 files changed, 98 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/clk-bulk.c b/drivers/clk/clk-bulk.c
index 4b357b2..3293c6b 100644
--- a/drivers/clk/clk-bulk.c
+++ b/drivers/clk/clk-bulk.c
@@ -17,9 +17,11 @@
  */
 
 #include <linux/clk.h>
+#include <linux/clk-provider.h>
 #include <linux/device.h>
 #include <linux/export.h>
 #include <linux/of.h>
+#include <linux/slab.h>
 
 #if defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK)
 static int __must_check of_clk_bulk_get(struct device_node *np, int num_clks,
@@ -50,6 +52,38 @@ static int __must_check of_clk_bulk_get(struct device_node *np, int num_clks,
 	return ret;
 }
 EXPORT_SYMBOL(of_clk_bulk_get);
+
+static int __must_check of_clk_bulk_get_all(struct device_node *np,
+					    struct clk_bulk_data **clks)
+{
+	struct clk_bulk_data *clk_bulk;
+	int num_clks;
+	int ret;
+
+	num_clks = of_clk_get_parent_count(np);
+	if (!num_clks)
+		return 0;
+
+	clk_bulk = kcalloc(num_clks, sizeof(*clk_bulk), GFP_KERNEL);
+	if (!clk_bulk)
+		return -ENOMEM;
+
+	ret = of_clk_bulk_get(np, num_clks, clk_bulk);
+	if (ret) {
+		kfree(clk_bulk);
+		return ret;
+	}
+
+	*clks = clk_bulk;
+
+	return num_clks;
+}
+#else
+static int __must_check of_clk_bulk_get_all(struct device_node *np,
+					    struct clk_bulk_data **clks)
+{
+	return -ENOENT;
+}
 #endif
 
 void clk_bulk_put(int num_clks, struct clk_bulk_data *clks)
@@ -90,6 +124,29 @@ int __must_check clk_bulk_get(struct device *dev, int num_clks,
 }
 EXPORT_SYMBOL(clk_bulk_get);
 
+void clk_bulk_put_all(int num_clks, struct clk_bulk_data *clks)
+{
+	if (IS_ERR_OR_NULL(clks))
+		return;
+
+	clk_bulk_put(num_clks, clks);
+
+	kfree(clks);
+}
+EXPORT_SYMBOL(clk_bulk_put_all);
+
+int __must_check clk_bulk_get_all(struct device *dev,
+				  struct clk_bulk_data **clks)
+{
+	struct device_node *np = dev_of_node(dev);
+
+	if (!np)
+		return 0;
+
+	return of_clk_bulk_get_all(np, clks);
+}
+EXPORT_SYMBOL(clk_bulk_get_all);
+
 #ifdef CONFIG_HAVE_CLK_PREPARE
 
 /**
diff --git a/include/linux/clk.h b/include/linux/clk.h
index 0dbd088..a76fdff 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -279,7 +279,26 @@ struct clk *clk_get(struct device *dev, const char *id);
  */
 int __must_check clk_bulk_get(struct device *dev, int num_clks,
 			      struct clk_bulk_data *clks);
-
+/**
+ * clk_bulk_get_all - lookup and obtain all available references to clock
+ *		      producer.
+ * @dev: device for clock "consumer"
+ * @clks: pointer to the clk_bulk_data table of consumer
+ *
+ * This helper function allows drivers to get all clk consumers in one
+ * operation. If any of the clk cannot be acquired then any clks
+ * that were obtained will be freed before returning to the caller.
+ *
+ * Returns a positive value for the number of clocks obtained while the
+ * clock references are stored in the clk_bulk_data table in @clks field.
+ * Returns 0 if there're none and a negative value if something failed.
+ *
+ * Drivers must assume that the clock source is not enabled.
+ *
+ * clk_bulk_get should not be called from within interrupt context.
+ */
+int __must_check clk_bulk_get_all(struct device *dev,
+				  struct clk_bulk_data **clks);
 /**
  * devm_clk_bulk_get - managed get multiple clk consumers
  * @dev: device for clock "consumer"
@@ -455,6 +474,19 @@ void clk_put(struct clk *clk);
 void clk_bulk_put(int num_clks, struct clk_bulk_data *clks);
 
 /**
+ * clk_bulk_put_all - "free" all the clock source
+ * @num_clks: the number of clk_bulk_data
+ * @clks: the clk_bulk_data table of consumer
+ *
+ * Note: drivers must ensure that all clk_bulk_enable calls made on this
+ * clock source are balanced by clk_bulk_disable calls prior to calling
+ * this function.
+ *
+ * clk_bulk_put_all should not be called from within interrupt context.
+ */
+void clk_bulk_put_all(int num_clks, struct clk_bulk_data *clks);
+
+/**
  * devm_clk_put	- "free" a managed clock source
  * @dev: device used to acquire the clock
  * @clk: clock source acquired with devm_clk_get()
@@ -609,6 +641,12 @@ static inline int __must_check clk_bulk_get(struct device *dev, int num_clks,
 	return 0;
 }
 
+static inline int __must_check clk_bulk_get_all(struct device *dev,
+					 struct clk_bulk_data **clks)
+{
+	return 0;
+}
+
 static inline struct clk *devm_clk_get(struct device *dev, const char *id)
 {
 	return NULL;
@@ -630,6 +668,8 @@ static inline void clk_put(struct clk *clk) {}
 
 static inline void clk_bulk_put(int num_clks, struct clk_bulk_data *clks) {}
 
+static inline void clk_bulk_put_all(int num_clks, struct clk_bulk_data *clks) {}
+
 static inline void devm_clk_put(struct device *dev, struct clk *clk) {}
 
 
-- 
2.7.4

[PATCH V2 3/4] clk: add managed version of clk_bulk_get_all

[Dong Aisheng]

This patch introduces the managed version of clk_bulk_get_all.

Cc: Michael Turquette <mturquette@baylibre.com>
Cc: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
---
v1->v2:
 * new patch
---
 drivers/clk/clk-devres.c | 24 ++++++++++++++++++++++++
 include/linux/clk.h      | 23 +++++++++++++++++++++++
 2 files changed, 47 insertions(+)

diff --git a/drivers/clk/clk-devres.c b/drivers/clk/clk-devres.c
index d854e26..6d3ca5e 100644
--- a/drivers/clk/clk-devres.c
+++ b/drivers/clk/clk-devres.c
@@ -70,6 +70,30 @@ int __must_check devm_clk_bulk_get(struct device *dev, int num_clks,
 }
 EXPORT_SYMBOL_GPL(devm_clk_bulk_get);
 
+int __must_check devm_clk_bulk_get_all(struct device *dev,
+				       struct clk_bulk_data **clks)
+{
+	struct clk_bulk_devres *devres;
+	int ret;
+
+	devres = devres_alloc(devm_clk_bulk_release,
+			      sizeof(*devres), GFP_KERNEL);
+	if (!devres)
+		return -ENOMEM;
+
+	ret = clk_bulk_get_all(dev, clks);
+	if (ret > 0) {
+		devres->clks = *clks;
+		devres->num_clks = ret;
+		devres_add(dev, devres);
+	} else {
+		devres_free(devres);
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(devm_clk_bulk_get_all);
+
 static int devm_clk_match(struct device *dev, void *res, void *data)
 {
 	struct clk **c = res;
diff --git a/include/linux/clk.h b/include/linux/clk.h
index a76fdff..fe48e01 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -313,6 +313,22 @@ int __must_check clk_bulk_get_all(struct device *dev,
  */
 int __must_check devm_clk_bulk_get(struct device *dev, int num_clks,
 				   struct clk_bulk_data *clks);
+/**
+ * devm_clk_bulk_get_all - managed get multiple clk consumers
+ * @dev: device for clock "consumer"
+ * @clks: pointer to the clk_bulk_data table of consumer
+ *
+ * Returns a positive value for the number of clocks obtained while the
+ * clock references are stored in the clk_bulk_data table in @clks field.
+ * Returns 0 if there're none and a negative value if something failed.
+ *
+ * This helper function allows drivers to get several clk
+ * consumers in one operation with management, the clks will
+ * automatically be freed when the device is unbound.
+ */
+
+int __must_check devm_clk_bulk_get_all(struct device *dev,
+				       struct clk_bulk_data **clks);
 
 /**
  * devm_clk_get - lookup and obtain a managed reference to a clock producer.
@@ -658,6 +674,13 @@ static inline int __must_check devm_clk_bulk_get(struct device *dev, int num_clk
 	return 0;
 }
 
+static inline int __must_check devm_clk_bulk_get_all(struct device *dev,
+						     struct clk_bulk_data **clks);
+{
+
+	return 0;
+}
+
 static inline struct clk *devm_get_clk_from_child(struct device *dev,
 				struct device_node *np, const char *con_id)
 {
-- 
2.7.4

[PATCH V2 4/4] video: simplefb: switch to use clk_bulk API to simplify clock operations

[Dong Aisheng]

Switching to use clk_bulk API to simplify clock operations.

Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: linux-fbdev at vger.kernel.org
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
---
v1->v2:
 * switch to clk_bulk_get_all from of_clk_bulk_get_all
---
 drivers/video/fbdev/simplefb.c | 69 ++++++++----------------------------------
 1 file changed, 13 insertions(+), 56 deletions(-)

diff --git a/drivers/video/fbdev/simplefb.c b/drivers/video/fbdev/simplefb.c
index a3c44ec..3c8124e 100644
--- a/drivers/video/fbdev/simplefb.c
+++ b/drivers/video/fbdev/simplefb.c
@@ -182,7 +182,7 @@ struct simplefb_par {
 #if defined CONFIG_OF && defined CONFIG_COMMON_CLK
 	bool clks_enabled;
 	unsigned int clk_count;
-	struct clk **clks;
+	struct clk_bulk_data *clks;
 #endif
 #if defined CONFIG_OF && defined CONFIG_REGULATOR
 	bool regulators_enabled;
@@ -214,37 +214,13 @@ static int simplefb_clocks_get(struct simplefb_par *par,
 			       struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
-	struct clk *clock;
-	int i;
 
 	if (dev_get_platdata(&pdev->dev) || !np)
 		return 0;
 
-	par->clk_count = of_clk_get_parent_count(np);
-	if (!par->clk_count)
-		return 0;
-
-	par->clks = kcalloc(par->clk_count, sizeof(struct clk *), GFP_KERNEL);
-	if (!par->clks)
-		return -ENOMEM;
-
-	for (i = 0; i < par->clk_count; i++) {
-		clock = of_clk_get(np, i);
-		if (IS_ERR(clock)) {
-			if (PTR_ERR(clock) == -EPROBE_DEFER) {
-				while (--i >= 0) {
-					if (par->clks[i])
-						clk_put(par->clks[i]);
-				}
-				kfree(par->clks);
-				return -EPROBE_DEFER;
-			}
-			dev_err(&pdev->dev, "%s: clock %d not found: %ld\n",
-				__func__, i, PTR_ERR(clock));
-			continue;
-		}
-		par->clks[i] = clock;
-	}
+	par->clk_count = clk_bulk_get_all(&pdev->dev, &par->clks);
+	if ((par->clk_count < 0) && (par->clk_count == -EPROBE_DEFER))
+		return -EPROBE_DEFER;
 
 	return 0;
 }
@@ -252,45 +228,26 @@ static int simplefb_clocks_get(struct simplefb_par *par,
 static void simplefb_clocks_enable(struct simplefb_par *par,
 				   struct platform_device *pdev)
 {
-	int i, ret;
+	int ret;
+
+	ret = clk_bulk_prepare_enable(par->clk_count, par->clks);
+	if (ret)
+		dev_warn(&pdev->dev, "failed to enable clocks\n");
 
-	for (i = 0; i < par->clk_count; i++) {
-		if (par->clks[i]) {
-			ret = clk_prepare_enable(par->clks[i]);
-			if (ret) {
-				dev_err(&pdev->dev,
-					"%s: failed to enable clock %d: %d\n",
-					__func__, i, ret);
-				clk_put(par->clks[i]);
-				par->clks[i] = NULL;
-			}
-		}
-	}
 	par->clks_enabled = true;
 }
 
 static void simplefb_clocks_destroy(struct simplefb_par *par)
 {
-	int i;
-
-	if (!par->clks)
-		return;
+	if (par->clks_enabled)
+		clk_bulk_disable_unprepare(par->clk_count, par->clks);
 
-	for (i = 0; i < par->clk_count; i++) {
-		if (par->clks[i]) {
-			if (par->clks_enabled)
-				clk_disable_unprepare(par->clks[i]);
-			clk_put(par->clks[i]);
-		}
-	}
-
-	kfree(par->clks);
+	clk_bulk_put_all(par->clk_count, par->clks);
 }
 #else
 static int simplefb_clocks_get(struct simplefb_par *par,
 	struct platform_device *pdev) { return 0; }
-static void simplefb_clocks_enable(struct simplefb_par *par,
-	struct platform_device *pdev) { }
+static int simplefb_clocks_enable(struct simplefb_par *par) { }
 static void simplefb_clocks_destroy(struct simplefb_par *par) { }
 #endif
 
-- 
2.7.4

[PATCH V2 4/4] video: simplefb: switch to use clk_bulk API to simplify clock operations

[kbuild test robot]

Hi Dong,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on clk/clk-next]
[also build test WARNING on v4.16-rc6 next-20180323]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Dong-Aisheng/clk-new-APIs-to-handle-all-available-clocks/20180323-185821
base:   https://git.kernel.org/pub/scm/linux/kernel/git/clk/linux.git clk-next

smatch warnings:
drivers/video/fbdev/simplefb.c:222 simplefb_clocks_get() warn: unsigned 'par->clk_count' is never less than zero.

vim +222 drivers/video/fbdev/simplefb.c

   193	
   194	#if defined CONFIG_OF && defined CONFIG_COMMON_CLK
   195	/*
   196	 * Clock handling code.
   197	 *
   198	 * Here we handle the clocks property of our "simple-framebuffer" dt node.
   199	 * This is necessary so that we can make sure that any clocks needed by
   200	 * the display engine that the bootloader set up for us (and for which it
   201	 * provided a simplefb dt node), stay up, for the life of the simplefb
   202	 * driver.
   203	 *
   204	 * When the driver unloads, we cleanly disable, and then release the clocks.
   205	 *
   206	 * We only complain about errors here, no action is taken as the most likely
   207	 * error can only happen due to a mismatch between the bootloader which set
   208	 * up simplefb, and the clock definitions in the device tree. Chances are
   209	 * that there are no adverse effects, and if there are, a clean teardown of
   210	 * the fb probe will not help us much either. So just complain and carry on,
   211	 * and hope that the user actually gets a working fb at the end of things.
   212	 */
   213	static int simplefb_clocks_get(struct simplefb_par *par,
   214				       struct platform_device *pdev)
   215	{
   216		struct device_node *np = pdev->dev.of_node;
   217	
   218		if (dev_get_platdata(&pdev->dev) || !np)
   219			return 0;
   220	
   221		par->clk_count = clk_bulk_get_all(&pdev->dev, &par->clks);
 > 222		if ((par->clk_count < 0) && (par->clk_count == -EPROBE_DEFER))
   223			return -EPROBE_DEFER;
   224	
   225		return 0;
   226	}
   227	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

[PATCH V2 0/4] clk: new APIs to handle all available clocks

[Dong Aisheng]

This patch series is a continue of discussion from here,
https://patchwork.kernel.org/patch/9986293/
that some users may want to handle all available clocks from device
tree without need to know the detailed clock information likes clock
numbers and names. This is useful in writing some generic drivers to
handle clock part.

Note:
This patch series is tested on MX6Q SDB cpufreq driver with a minor change
to switch to use clk_bulk_get_all.
But patch 4 only test compiling. Hopefully someone could help test
the function.

v1->v2:
 * add clk_bulk_{get|put}_all() which only supports DT platform currently
 * remove _all variants and the wrapper struct clk_bulk
 * make of_clk_bulk_get and of_clk_bulk_get_all private until someone
   proves they need it because they don't have a struct device pointer.

Dong Aisheng (4):
  clk: bulk: add of_clk_bulk_get()
  clk: add new APIs to operate on all available clocks
  clk: add managed version of clk_bulk_get_all
  video: simplefb: switch to use clk_bulk API to simplify clock
    operations

 drivers/clk/clk-bulk.c         | 89 ++++++++++++++++++++++++++++++++++++++++++
 drivers/clk/clk-devres.c       | 24 ++++++++++++
 drivers/video/fbdev/simplefb.c | 69 ++++++--------------------------
 include/linux/clk.h            | 65 +++++++++++++++++++++++++++++-
 4 files changed, 190 insertions(+), 57 deletions(-)

-- 
2.7.4

[PATCH V2 1/4] clk: bulk: add of_clk_bulk_get()

[Dong Aisheng]

'clock-names' property is optional in DT, so of_clk_bulk_get() is
introduced here to handle this for DT users without 'clock-names'
specified. Later clk_bulk_get_all() will be implemented on top of
it and this API will be kept private until someone proves they need
it because they don't have a struct device pointer.

Cc: Stephen Boyd <sboyd@codeaurora.org>
Cc: Michael Turquette <mturquette@baylibre.com>
Cc: Russell King <linux@arm.linux.org.uk>
Reported-by: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
---
 drivers/clk/clk-bulk.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/drivers/clk/clk-bulk.c b/drivers/clk/clk-bulk.c
index 4c10456..4b357b2 100644
--- a/drivers/clk/clk-bulk.c
+++ b/drivers/clk/clk-bulk.c
@@ -19,6 +19,38 @@
 #include <linux/clk.h>
 #include <linux/device.h>
 #include <linux/export.h>
+#include <linux/of.h>
+
+#if defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK)
+static 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("%pOF: Failed to get clk index: %d ret: %d\n",
+			       np, i, ret);
+			clks[i].clk = NULL;
+			goto err;
+		}
+	}
+
+	return 0;
+
+err:
+	clk_bulk_put(i, clks);
+
+	return ret;
+}
+EXPORT_SYMBOL(of_clk_bulk_get);
+#endif
 
 void clk_bulk_put(int num_clks, struct clk_bulk_data *clks)
 {
-- 
2.7.4

[PATCH V2 1/4] clk: bulk: add of_clk_bulk_get()

[Stephen Boyd]

Quoting Dong Aisheng (2018-03-20 20:19:48)
> diff --git a/drivers/clk/clk-bulk.c b/drivers/clk/clk-bulk.c
> index 4c10456..4b357b2 100644
> --- a/drivers/clk/clk-bulk.c
> +++ b/drivers/clk/clk-bulk.c
> @@ -19,6 +19,38 @@
>  #include <linux/clk.h>
>  #include <linux/device.h>
>  #include <linux/export.h>
> +#include <linux/of.h>
> +
> +#if defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK)

Do we need these defines? of_clk_get() is a stub function when these
configs are false.

> +static 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("%pOF: Failed to get clk index: %d ret: %d\n",
> +                              np, i, ret);
> +                       clks[i].clk = NULL;
> +                       goto err;
> +               }
> +       }
> +
> +       return 0;
> +
> +err:
> +       clk_bulk_put(i, clks);
> +
> +       return ret;
> +}
> +EXPORT_SYMBOL(of_clk_bulk_get);

It's static, so don't export it.

[PATCH V2 1/4] clk: bulk: add of_clk_bulk_get()

[A.s. Dong]

Hi Stephen,

> -----Original Message-----
> From: Stephen Boyd [mailto:sboyd at kernel.org]
> Sent: Saturday, March 24, 2018 12:53 AM
> To: A.s. Dong <aisheng.dong@nxp.com>; linux-clk at vger.kernel.org
> Cc: linux-kernel at vger.kernel.org; linux-arm-kernel at lists.infradead.org;
> mturquette at baylibre.com; hdegoede at redhat.com;
> b.zolnierkie at samsung.com; linux at armlinux.org.uk; linux-
> fbdev at vger.kernel.org; dl-linux-imx <linux-imx@nxp.com>; A.s. Dong
> <aisheng.dong@nxp.com>; Stephen Boyd <sboyd@codeaurora.org>; Russell
> King <linux@arm.linux.org.uk>
> Subject: Re: [PATCH V2 1/4] clk: bulk: add of_clk_bulk_get()
> 
> Quoting Dong Aisheng (2018-03-20 20:19:48)
> > diff --git a/drivers/clk/clk-bulk.c b/drivers/clk/clk-bulk.c index
> > 4c10456..4b357b2 100644
> > --- a/drivers/clk/clk-bulk.c
> > +++ b/drivers/clk/clk-bulk.c
> > @@ -19,6 +19,38 @@
> >  #include <linux/clk.h>
> >  #include <linux/device.h>
> >  #include <linux/export.h>
> > +#include <linux/of.h>
> > +
> > +#if defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK)
> 
> Do we need these defines? of_clk_get() is a stub function when these
> configs are false.
> 

You're right. Will drop it.

> > +static 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("%pOF: Failed to get clk index: %d ret: %d\n",
> > +                              np, i, ret);
> > +                       clks[i].clk = NULL;
> > +                       goto err;
> > +               }
> > +       }
> > +
> > +       return 0;
> > +
> > +err:
> > +       clk_bulk_put(i, clks);
> > +
> > +       return ret;
> > +}
> > +EXPORT_SYMBOL(of_clk_bulk_get);
> 
> It's static, so don't export it.

Got it.
Sorry for such mistake.

Will fix and sent V3.

Regards
Dong Aisheng