Hi Akhil,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on tegra/for-next] [also build test ERROR on v5.16-rc2 next-20211123] [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]

url: https://github.com/0day-ci/linux/commits/Akhil-R/i2c-tegra-Add-ACPI-support/... base: https://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux.git for-next config: riscv-buildonly-randconfig-r005-20211123 (https://download.01.org/0day-ci/archive/20211124/202111240017.bYyZ7knz-lkp@i...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 49e3838145dff1ec91c2e67a2cb562775c8d2a08) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install riscv cross compiling tool for clang build # apt-get install binutils-riscv64-linux-gnu # https://github.com/0day-ci/linux/commit/dec174be801f41a9e42f4381c59c2357c25e... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Akhil-R/i2c-tegra-Add-ACPI-support/20211123-151636 git checkout dec174be801f41a9e42f4381c59c2357c25e40fb # save the config file to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=riscv

If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot lkp@intel.com

All errors (new ones prefixed by >>):

In file included from drivers/i2c/busses/i2c-tegra.c:13: In file included from include/linux/dmaengine.h:12: In file included from include/linux/scatterlist.h:9: In file included from arch/riscv/include/asm/io.h:136: include/asm-generic/io.h:464:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __raw_readb(PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:477:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/little_endian.h:36:51: note: expanded from macro '__le16_to_cpu' #define __le16_to_cpu(x) ((__force __u16)(__le16)(x)) ^ In file included from drivers/i2c/busses/i2c-tegra.c:13: In file included from include/linux/dmaengine.h:12: In file included from include/linux/scatterlist.h:9: In file included from arch/riscv/include/asm/io.h:136: include/asm-generic/io.h:490:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/little_endian.h:34:51: note: expanded from macro '__le32_to_cpu' #define __le32_to_cpu(x) ((__force __u32)(__le32)(x)) ^ In file included from drivers/i2c/busses/i2c-tegra.c:13: In file included from include/linux/dmaengine.h:12: In file included from include/linux/scatterlist.h:9: In file included from arch/riscv/include/asm/io.h:136: include/asm-generic/io.h:501:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writeb(value, PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:511:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:521:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:1024:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port; ~~~~~~~~~~ ^

...

drivers/i2c/busses/i2c-tegra.c:623:16: error: implicit declaration of function 'acpi_has_method' [-Werror,-Wimplicit-function-declaration]

if (handle && acpi_has_method(handle, "_RST")) ^ drivers/i2c/busses/i2c-tegra.c:623:16: note: did you mean 'acpi_has_watchdog'? include/linux/acpi.h:1321:20: note: 'acpi_has_watchdog' declared here static inline bool acpi_has_watchdog(void) { return false; } ^ 7 warnings and 1 error generated.

vim +/acpi_has_method +623 drivers/i2c/busses/i2c-tegra.c

608 609 static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev) 610 { 611 u32 val, clk_divisor, clk_multiplier, tsu_thd, tlow, thigh, non_hs_mode; 612 acpi_handle handle = ACPI_HANDLE(i2c_dev->dev); 613 int err; 614 615 /* 616 * The reset shouldn't ever fail in practice. The failure will be a 617 * sign of a severe problem that needs to be resolved. Still we don't 618 * want to fail the initialization completely because this may break 619 * kernel boot up since voltage regulators use I2C. Hence, we will 620 * emit a noisy warning on error, which won't stay unnoticed and 621 * won't hose machine entirely. 622 */

623 if (handle && acpi_has_method(handle, "_RST"))

624 err = (acpi_evaluate_object(handle, "_RST", NULL, NULL)); 625 else 626 err = reset_control_reset(i2c_dev->rst); 627 628 WARN_ON_ONCE(err); 629 630 if (i2c_dev->is_dvc) 631 tegra_dvc_init(i2c_dev); 632 633 val = I2C_CNFG_NEW_MASTER_FSM | I2C_CNFG_PACKET_MODE_EN | 634 FIELD_PREP(I2C_CNFG_DEBOUNCE_CNT, 2); 635 636 if (i2c_dev->hw->has_multi_master_mode) 637 val |= I2C_CNFG_MULTI_MASTER_MODE; 638 639 i2c_writel(i2c_dev, val, I2C_CNFG); 640 i2c_writel(i2c_dev, 0, I2C_INT_MASK); 641 642 if (i2c_dev->is_vi) 643 tegra_i2c_vi_init(i2c_dev); 644 645 switch (i2c_dev->bus_clk_rate) { 646 case I2C_MAX_STANDARD_MODE_FREQ + 1 ... I2C_MAX_FAST_MODE_PLUS_FREQ: 647 default: 648 tlow = i2c_dev->hw->tlow_fast_fastplus_mode; 649 thigh = i2c_dev->hw->thigh_fast_fastplus_mode; 650 tsu_thd = i2c_dev->hw->setup_hold_time_fast_fast_plus_mode; 651 652 if (i2c_dev->bus_clk_rate > I2C_MAX_FAST_MODE_FREQ) 653 non_hs_mode = i2c_dev->hw->clk_divisor_fast_plus_mode; 654 else 655 non_hs_mode = i2c_dev->hw->clk_divisor_fast_mode; 656 break; 657 658 case 0 ... I2C_MAX_STANDARD_MODE_FREQ: 659 tlow = i2c_dev->hw->tlow_std_mode; 660 thigh = i2c_dev->hw->thigh_std_mode; 661 tsu_thd = i2c_dev->hw->setup_hold_time_std_mode; 662 non_hs_mode = i2c_dev->hw->clk_divisor_std_mode; 663 break; 664 } 665 666 /* make sure clock divisor programmed correctly */ 667 clk_divisor = FIELD_PREP(I2C_CLK_DIVISOR_HSMODE, 668 i2c_dev->hw->clk_divisor_hs_mode) | 669 FIELD_PREP(I2C_CLK_DIVISOR_STD_FAST_MODE, non_hs_mode); 670 i2c_writel(i2c_dev, clk_divisor, I2C_CLK_DIVISOR); 671 672 if (i2c_dev->hw->has_interface_timing_reg) { 673 val = FIELD_PREP(I2C_INTERFACE_TIMING_THIGH, thigh) | 674 FIELD_PREP(I2C_INTERFACE_TIMING_TLOW, tlow); 675 i2c_writel(i2c_dev, val, I2C_INTERFACE_TIMING_0); 676 } 677 678 /* 679 * Configure setup and hold times only when tsu_thd is non-zero. 680 * Otherwise, preserve the chip default values. 681 */ 682 if (i2c_dev->hw->has_interface_timing_reg && tsu_thd) 683 i2c_writel(i2c_dev, tsu_thd, I2C_INTERFACE_TIMING_1); 684 685 clk_multiplier = (tlow + thigh + 2) * (non_hs_mode + 1); 686 687 err = clk_set_rate(i2c_dev->div_clk, 688 i2c_dev->bus_clk_rate * clk_multiplier); 689 if (err) { 690 dev_err(i2c_dev->dev, "failed to set div-clk rate: %d\n", err); 691 return err; 692 } 693 694 if (!i2c_dev->is_dvc && !i2c_dev->is_vi) { 695 u32 sl_cfg = i2c_readl(i2c_dev, I2C_SL_CNFG); 696 697 sl_cfg |= I2C_SL_CNFG_NACK | I2C_SL_CNFG_NEWSL; 698 i2c_writel(i2c_dev, sl_cfg, I2C_SL_CNFG); 699 i2c_writel(i2c_dev, 0xfc, I2C_SL_ADDR1); 700 i2c_writel(i2c_dev, 0x00, I2C_SL_ADDR2); 701 } 702 703 err = tegra_i2c_flush_fifos(i2c_dev); 704 if (err) 705 return err; 706 707 if (i2c_dev->multimaster_mode && i2c_dev->hw->has_slcg_override_reg) 708 i2c_writel(i2c_dev, I2C_MST_CORE_CLKEN_OVR, I2C_CLKEN_OVERRIDE); 709 710 err = tegra_i2c_wait_for_config_load(i2c_dev); 711 if (err) 712 return err; 713 714 return 0; 715 } 716

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