clk: keystone: syscon-clk: Fix audio refclk

Audio REFCLK's are not working correctly, trying to use them lead to the
following errors:

[    6.575277] of_clk_hw_onecell_get: invalid index 4294934528
[    6.581515] wm8904 1-001a: Failed to get MCLK
[    6.586290] wm8904: probe of 1-001a failed with error -2

The issue is that Audio REFCLK has #clock-cells = 0 [1], while the driver
is registering those clocks assuming they have one cells. Fix this by
registering the clock with of_clk_hw_simple_get() when there is only one
instance, e.g. "audio_refclk".

[1] Documentation/devicetree/bindings/clock/ti,am62-audio-refclk.yaml

Fixes: 6acab96ee337 ("clk: keystone: syscon-clk: Add support for audio refclk")
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Link: https://lore.kernel.org/r/20230728222639.110409-1-francesco@dolcini.it
[sboyd@kernel.org: Simplify if-return-else logic]
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

diff --git a/drivers/clk/keystone/syscon-clk.c b/drivers/clk/keystone/syscon-clk.c
index d33f741..935d9a2 100644 (file)
--- a/drivers/clk/keystone/syscon-clk.c
+++ b/drivers/clk/keystone/syscon-clk.c
@@ -151,8 +151,10 @@ static int ti_syscon_gate_clk_probe(struct platform_device *pdev)
                                 data[i].name);
        }
 
-       return devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get,
-                                          hw_data);
+       if (num_clks == 1)
+               return devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get,
+                                                  hw_data->hws[0]);
+       return devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, hw_data);
 }
 
 #define TI_SYSCON_CLK_GATE(_name, _offset, _bit_idx)   \