[v3,4/5] soc/tegra: pmc: Use of_clk_get_parent_count() instead of open coding

Message ID 1524063005-1716-5-git-send-email-geert+renesas@glider.be
State New
Headers show
Series
  • Use of_clk_get_parent_count() instead of open coding
Related show

Commit Message

Geert Uytterhoeven April 18, 2018, 2:50 p.m.
As of_clk_get_parent_count() returns zero on failure, while
of_count_phandle_with_args() might return a negative error code, this
also fixes the issue of possibly using a very big number in the
allocation below.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Jon Hunter <jonathanh@nvidia.com>
---
This depends on "[PATCH v3 1/5] clk: Extract OF clock helpers in
<linux/of_clk.h>".

v3:
  - Add Acked-by,

v2:
  - of_clk_get_parent_count() was moved to <linux/of_clk.h>.
---
 drivers/soc/tegra/pmc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Comments

Daniel Lezcano April 30, 2018, 1:44 p.m. | #1
On Wed, Apr 18, 2018 at 04:50:04PM +0200, Geert Uytterhoeven wrote:
> As of_clk_get_parent_count() returns zero on failure, while
> of_count_phandle_with_args() might return a negative error code, this
> also fixes the issue of possibly using a very big number in the
> allocation below.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
> Acked-by: Jon Hunter <jonathanh@nvidia.com>
> ---
> This depends on "[PATCH v3 1/5] clk: Extract OF clock helpers in
> <linux/of_clk.h>".
> 
> v3:
>   - Add Acked-by,
> 
> v2:
>   - of_clk_get_parent_count() was moved to <linux/of_clk.h>.
> ---

Reviewed-by: Daniel Lezcano <daniel.lezcano@linaro.org>




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Stephen Boyd May 2, 2018, 3:38 p.m. | #2
Quoting Geert Uytterhoeven (2018-04-18 07:50:04)
> As of_clk_get_parent_count() returns zero on failure, while
> of_count_phandle_with_args() might return a negative error code, this
> also fixes the issue of possibly using a very big number in the
> allocation below.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
> Acked-by: Jon Hunter <jonathanh@nvidia.com>
> ---

Applied to clk-next

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Patch

diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
index d9fcdb592b3966a5..d8cb48a4b8eb1b78 100644
--- a/drivers/soc/tegra/pmc.c
+++ b/drivers/soc/tegra/pmc.c
@@ -31,6 +31,7 @@ 
 #include <linux/iopoll.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
+#include <linux/of_clk.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/pm_domain.h>
@@ -725,7 +726,7 @@  static int tegra_powergate_of_get_clks(struct tegra_powergate *pg,
 	unsigned int i, count;
 	int err;
 
-	count = of_count_phandle_with_args(np, "clocks", "#clock-cells");
+	count = of_clk_get_parent_count(np);
 	if (count == 0)
 		return -ENODEV;