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authorThomas Petazzoni <thomas.petazzoni@free-electrons.com>2014-09-16 19:15:03 +0400
committerJason Cooper <jason@lakedaemon.net>2014-09-16 19:39:33 +0400
commit5f093ee76c8fc1ec82de8da04bd087663c853e7b (patch)
tree6e28976d661add58236771700ebf930ea342c05c /drivers/clk/mvebu
parentceac26c64200015a5e6e358e903b1ca9a6f41dd8 (diff)
downloadlinux-5f093ee76c8fc1ec82de8da04bd087663c853e7b.tar.xz
clk: mvebu: fix sscg node lookup
Commit 15917b16022427c53755abff4dc7051f3076dd7a ("clk: mvebu: Fix clk frequency value if SSCG is enabled") introduced some logic in the common mvebu clock code to adjust the clock frequency according to the configuration of the SSCG. In order to do this, it looks up for a DT node called "sscg" and maps it before accessing the SSCG configuration register. However, the lookup is currently done using: sscg_np = of_find_node_by_name(np, "sscg"); where "np" is a pointer to the DT node of the clock for which we are calculating the adjusted frequency. This means that if the "sscg" node is *after* the clock node in the Device Tree, it works fine (and that's the case for Armada 370). However, if it turns out that the "sscg" node is *before* the clock node in the Device Tree, it won't work because the sscg node will not be found. What we really want here is a search of the entire Device Tree, not only starting from the clock node, so instead of passing "np" as first argument of of_find_node_by_name(), we simply need to pass NULL. Passing a non-NULL argument is typically used in a loop, so that the search for the next matching node starts right after the node that was matched. This makes the "np" argument to the kirkwood_fix_sscg_deviation() function unnecessary, which leads to further cleanups. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Fixes: 15917b1602242 ("clk: mvebu: Fix clk frequency value if SSCG is enabled") Acked-by: Gregory CLEMENT <gregory.clement@free-electrons.com> Link: https://lkml.kernel.org/r/1410880503-2322-1-git-send-email-thomas.petazzoni@free-electrons.com Signed-off-by: Jason Cooper <jason@lakedaemon.net>
Diffstat (limited to 'drivers/clk/mvebu')
-rw-r--r--drivers/clk/mvebu/common.c6
-rw-r--r--drivers/clk/mvebu/common.h4
2 files changed, 5 insertions, 5 deletions
diff --git a/drivers/clk/mvebu/common.c b/drivers/clk/mvebu/common.c
index 354bbadb3bce..f902c18f4552 100644
--- a/drivers/clk/mvebu/common.c
+++ b/drivers/clk/mvebu/common.c
@@ -41,7 +41,7 @@ static struct clk_onecell_data clk_data;
* chosen following the dt convention: using the first known SoC
* compatible with it.
*/
-u32 kirkwood_fix_sscg_deviation(struct device_node *np, u32 system_clk)
+u32 kirkwood_fix_sscg_deviation(u32 system_clk)
{
struct device_node *sscg_np = NULL;
void __iomem *sscg_map;
@@ -49,7 +49,7 @@ u32 kirkwood_fix_sscg_deviation(struct device_node *np, u32 system_clk)
s32 low_bound, high_bound;
u64 freq_swing_half;
- sscg_np = of_find_node_by_name(np, "sscg");
+ sscg_np = of_find_node_by_name(NULL, "sscg");
if (sscg_np == NULL) {
pr_err("cannot get SSCG register node\n");
return system_clk;
@@ -142,7 +142,7 @@ void __init mvebu_coreclk_setup(struct device_node *np,
if (desc->is_sscg_enabled && desc->fix_sscg_deviation
&& desc->is_sscg_enabled(base))
- rate = desc->fix_sscg_deviation(np, rate);
+ rate = desc->fix_sscg_deviation(rate);
clk_data.clks[1] = clk_register_fixed_rate(NULL, cpuclk_name, NULL,
CLK_IS_ROOT, rate);
diff --git a/drivers/clk/mvebu/common.h b/drivers/clk/mvebu/common.h
index 59efaa850bde..989ab1464617 100644
--- a/drivers/clk/mvebu/common.h
+++ b/drivers/clk/mvebu/common.h
@@ -29,7 +29,7 @@ struct coreclk_soc_desc {
u32 (*get_cpu_freq)(void __iomem *sar);
void (*get_clk_ratio)(void __iomem *sar, int id, int *mult, int *div);
bool (*is_sscg_enabled)(void __iomem *sar);
- u32 (*fix_sscg_deviation)(struct device_node *np, u32 system_clk);
+ u32 (*fix_sscg_deviation)(u32 system_clk);
const struct coreclk_ratio *ratios;
int num_ratios;
};
@@ -51,5 +51,5 @@ void __init mvebu_clk_gating_setup(struct device_node *np,
* This function is shared among the Kirkwood, Armada 370, Armada XP
* and Armada 375 SoC
*/
-u32 kirkwood_fix_sscg_deviation(struct device_node *np, u32 system_clk);
+u32 kirkwood_fix_sscg_deviation(u32 system_clk);
#endif