openwrt/target/linux/bcm53xx/patches-5.10/320-ARM-dts-BCM5301X-Switch-back-to-old-clock-nodes-name.patch

From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <[email protected]>
Date: Tue, 23 Nov 2021 13:13:05 +0100
Subject: [PATCH] ARM: dts: BCM5301X: Switch back to old clock nodes names
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First of all using the same node name prefix resulted in trying to
register 2 clocks under the same "clock-controller" name:

[    0.000000] __clk_core_init: clk clock-controller already initialized
[    0.000000] ------------[ cut here ]------------
[    0.000000] WARNING: CPU: 0 PID: 0 at drivers/clk/bcm/clk-iproc-pll.c:802 iproc_pll_clk_setup+0x4c8/0x4f4
[    0.000000] Modules linked in:
[    0.000000] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.10.80 #0
[    0.000000] Hardware name: BCM5301X
[    0.000000] [<c0108410>] (unwind_backtrace) from [<c0104bc4>] (show_stack+0x10/0x14)
[    0.000000] [<c0104bc4>] (show_stack) from [<c03dca28>] (dump_stack+0x94/0xa8)
[    0.000000] [<c03dca28>] (dump_stack) from [<c0118440>] (__warn+0xb8/0x114)
[    0.000000] [<c0118440>] (__warn) from [<c0118504>] (warn_slowpath_fmt+0x68/0x78)
[    0.000000] [<c0118504>] (warn_slowpath_fmt) from [<c043281c>] (iproc_pll_clk_setup+0x4c8/0x4f4)
[    0.000000] [<c043281c>] (iproc_pll_clk_setup) from [<c0818c04>] (nsp_genpll_clk_init+0x30/0x38)
[    0.000000] [<c0818c04>] (nsp_genpll_clk_init) from [<c0818634>] (of_clk_init+0x118/0x1f8)
[    0.000000] [<c0818634>] (of_clk_init) from [<c08039b0>] (time_init+0x24/0x30)
[    0.000000] [<c08039b0>] (time_init) from [<c0800d14>] (start_kernel+0x398/0x50c)
[    0.000000] [<c0800d14>] (start_kernel) from [<00000000>] (0x0)
[    0.000000] ---[ end trace fe236bfe9559ee50 ]---

Secondly using any other names than "lcpll0" and "genpll" breaks output
clocks:

$ cat /sys/kernel/debug/clk/usbclk/clk_rate
0

For some reason iproc_clk_recalc_rate() gets called with "parent_rate"
argument 0 whenever clocks aren't named "lcpll0" and "genpll".

Signed-off-by: Rafał Miłecki <[email protected]>
---
 arch/arm/boot/dts/bcm5301x.dtsi | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/arch/arm/boot/dts/bcm5301x.dtsi
+++ b/arch/arm/boot/dts/bcm5301x.dtsi
@@ -421,7 +421,7 @@
 			#address-cells = <1>;
 			#size-cells = <1>;
 
-			lcpll0: clock-controller@100 {
+			lcpll0: lcpll0@100 {
 				#clock-cells = <1>;
 				compatible = "brcm,nsp-lcpll0";
 				reg = <0x100 0x14>;
@@ -430,7 +430,7 @@
 						     "sdio", "ddr_phy";
 			};
 
-			genpll: clock-controller@140 {
+			genpll: genpll@140 {
 				#clock-cells = <1>;
 				compatible = "brcm,nsp-genpll";
 				reg = <0x140 0x24>;