[PATCH 4/4] net: stmmac: Add glue layer for Sophgo SG2044 SoC

[kernel test robot]

Hi Inochi,

kernel test robot noticed the following build warnings:

[auto build test WARNING on robh/for-next]
[also build test WARNING on sophgo/for-next sophgo/fixes net-next/main net/main linus/master v6.12-rc4 next-20241021]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Inochi-Amaoto/dt-bindings-net-snps-dwmac-Add-dwmac-5-30a-version/20241021-184301
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
patch link:    https://lore.kernel.org/r/20241021103617.653386-5-inochiama%40gmail.com
patch subject: [PATCH 4/4] net: stmmac: Add glue layer for Sophgo SG2044 SoC
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20241022/202410221853.0nt4WyvW-lkp@intel.com/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241022/202410221853.0nt4WyvW-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202410221853.0nt4WyvW-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/net/ethernet/stmicro/stmmac/dwmac-sophgo.c:41:2: warning: variable 'rate' is used uninitialized whenever switch default is taken [-Wsometimes-uninitialized]
      41 |         default:
         |         ^~~~~~~
   drivers/net/ethernet/stmicro/stmmac/dwmac-sophgo.c:46:36: note: uninitialized use occurs here
      46 |         ret = clk_set_rate(dwmac->clk_tx, rate);
         |                                           ^~~~
   drivers/net/ethernet/stmicro/stmmac/dwmac-sophgo.c:28:20: note: initialize the variable 'rate' to silence this warning
      28 |         unsigned long rate;
         |                           ^
         |                            = 0
   1 warning generated.

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for MODVERSIONS
   Depends on [n]: MODULES [=y] && !COMPILE_TEST [=y]
   Selected by [y]:
   - RANDSTRUCT_FULL [=y] && (CC_HAS_RANDSTRUCT [=y] || GCC_PLUGINS [=n]) && MODULES [=y]


vim +/rate +41 drivers/net/ethernet/stmicro/stmmac/dwmac-sophgo.c

    24	
    25	static void sophgo_dwmac_fix_mac_speed(void *priv, unsigned int speed, unsigned int mode)
    26	{
    27		struct sophgo_dwmac *dwmac = priv;
    28		unsigned long rate;
    29		int ret;
    30	
    31		switch (speed) {
    32		case SPEED_1000:
    33			rate = 125000000;
    34			break;
    35		case SPEED_100:
    36			rate = 25000000;
    37			break;
    38		case SPEED_10:
    39			rate = 2500000;
    40			break;
  > 41		default:
    42			dev_err(dwmac->dev, "invalid speed %u\n", speed);
    43			break;
    44		}
    45	
    46		ret = clk_set_rate(dwmac->clk_tx, rate);
    47		if (ret)
    48			dev_err(dwmac->dev, "failed to set tx rate %lu\n", rate);
    49	}
    50	

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