[freescale-fslc:6.6-2.0.x-imx 537/16788] drivers/clk/imx/clk-lpcg-scu.c:51:21: warning: variable 'reg1' set but not used

[kernel test robot <lkp@intel.com>]

tree:   https://github.com/Freescale/linux-fslc 6.6-2.0.x-imx
head:   ac32ba5fe66266329914d2020570364afe217bec
commit: 3440db800daa934166a7135e4b671763ec5d3e41 [537/16788] LF-446 clk: imx: lpcg-scu: SW workaround for errata (e10858)
config: arm64-randconfig-002-20240928 (https://download.01.org/0day-ci/archive/20240928/202409281741.4rhDN0AP-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 14.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240928/202409281741.4rhDN0AP-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202409281741.4rhDN0AP-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/clk/imx/clk-lpcg-scu.c: In function 'do_lpcg_workaround':
>> drivers/clk/imx/clk-lpcg-scu.c:51:21: warning: variable 'reg1' set but not used [-Wunused-but-set-variable]
      51 |                 u32 reg1;
         |                     ^~~~


vim +/reg1 +51 drivers/clk/imx/clk-lpcg-scu.c

    44	
    45	/* e10858 -LPCG clock gating register synchronization errata */
    46	static void do_lpcg_workaround(u32 rate, void __iomem *reg, u32 val)
    47	{
    48		writel(val, reg);
    49	
    50		if (rate >= 24000000 || rate == 0) {
  > 51			u32 reg1;
    52	
    53			/*
    54			 * The time taken to access the LPCG registers from the AP core
    55			 * through the interconnect is longer than the minimum delay
    56			 * of 4 clock cycles required by the errata.
    57			 * Adding a readl will provide sufficient delay to prevent
    58			 * back-to-back writes.
    59			 */
    60			reg1 = readl(reg);
    61		} else {
    62			/*
    63			 * For clocks running below 24MHz, wait a minimum of
    64			 * 4 clock cycles.
    65			 */
    66			ndelay(4 * (DIV_ROUND_UP(1000000000, rate)));
    67		}
    68	}
    69	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki