Re: [PATCH v2 4/6] phy: phy-can-transceiver: Add support for generic CAN transceiver driver

[kernel test robot]

Hi Aswath,

I love your patch! Perhaps something to improve:

[auto build test WARNING on mkl-can-next/testing]
[also build test WARNING on linux/master robh/for-next linus/master v5.12-rc7 next-20210414]
[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/Aswath-Govindraju/CAN-TRANSCEIVER-Add-support-for-CAN-transceivers/20210414-220857
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next.git testing
config: arm64-randconfig-r012-20210415 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 6a18cc23efad410db48a3ccfc233d215de7d4cb9)
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 arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://github.com/0day-ci/linux/commit/f0bb46b67a1f6116c84a7691e05f5059377e4640
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Aswath-Govindraju/CAN-TRANSCEIVER-Add-support-for-CAN-transceivers/20210414-220857
        git checkout f0bb46b67a1f6116c84a7691e05f5059377e4640
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=arm64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

>> drivers/phy/phy-can-transceiver.c:79:5: warning: no previous prototype for function 'can_transceiver_phy_probe' [-Wmissing-prototypes]
   int can_transceiver_phy_probe(struct platform_device *pdev)
       ^
   drivers/phy/phy-can-transceiver.c:79:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int can_transceiver_phy_probe(struct platform_device *pdev)
   ^
   static 
   1 warning generated.


vim +/can_transceiver_phy_probe +79 drivers/phy/phy-can-transceiver.c

    78	
  > 79	int can_transceiver_phy_probe(struct platform_device *pdev)
    80	{
    81		struct phy_provider *phy_provider;
    82		struct device *dev = &pdev->dev;
    83		struct can_transceiver_phy *can_transceiver_phy;
    84		const struct can_transceiver_data *drvdata;
    85		const struct of_device_id *match;
    86		struct phy *phy;
    87		struct gpio_desc *standby_gpio;
    88		struct gpio_desc *enable_gpio;
    89		u32 max_bitrate = 0;
    90	
    91		can_transceiver_phy = devm_kzalloc(dev, sizeof(struct can_transceiver_phy), GFP_KERNEL);
    92		if (!can_transceiver_phy)
    93			return -ENOMEM;
    94	
    95		match = of_match_node(can_transceiver_phy_ids, pdev->dev.of_node);
    96		drvdata = match->data;
    97	
    98		phy = devm_phy_create(dev, dev->of_node,
    99				      &can_transceiver_phy_ops);
   100		if (IS_ERR(phy)) {
   101			dev_err(dev, "failed to create can transceiver phy\n");
   102			return PTR_ERR(phy);
   103		}
   104	
   105		device_property_read_u32(dev, "max-bitrate", &max_bitrate);
   106		if (!max_bitrate)
   107			dev_warn(dev, "Invalid value for transceiver max bitrate. Ignoring bitrate limit\n");
   108		phy->attrs.max_link_rate = max_bitrate;
   109	
   110		can_transceiver_phy->generic_phy = phy;
   111	
   112		if (drvdata->flags & CAN_TRANSCEIVER_STB_PRESENT) {
   113			standby_gpio = devm_gpiod_get(dev, "standby", GPIOD_OUT_HIGH);
   114			if (IS_ERR(standby_gpio))
   115				return PTR_ERR(standby_gpio);
   116			can_transceiver_phy->standby_gpio = standby_gpio;
   117		}
   118	
   119		if (drvdata->flags & CAN_TRANSCEIVER_EN_PRESENT) {
   120			enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
   121			if (IS_ERR(enable_gpio))
   122				return PTR_ERR(enable_gpio);
   123			can_transceiver_phy->enable_gpio = enable_gpio;
   124		}
   125	
   126		phy_set_drvdata(can_transceiver_phy->generic_phy, can_transceiver_phy);
   127	
   128		phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
   129	
   130		return PTR_ERR_OR_ZERO(phy_provider);
   131	}
   132	

---
0-DAY CI Kernel Test Service, Intel Corporation
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