Re: [PATCH 3/3] mailbox: sophgo: add mailbox driver for cv18x SoCs

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

Hi Yuntao,

kernel test robot noticed the following build warnings:

[auto build test WARNING on robh/for-next]
[also build test WARNING on linus/master v6.10-rc4 next-20240619]
[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/Yuntao-Dai/dt-bindings-mailbox-add-Sophgo-cv18x-SoCs-mailbox/20240618-232307
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
patch link:    https://lore.kernel.org/r/SYBP282MB2238F93AB57A398E322644C3C4CE2%40SYBP282MB2238.AUSP282.PROD.OUTLOOK.COM
patch subject: [PATCH 3/3] mailbox: sophgo: add mailbox driver for cv18x SoCs
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20240620/202406200820.Wms9UPDw-lkp@intel.com/config)
compiler: clang version 18.1.5 (https://github.com/llvm/llvm-project 617a15a9eac96088ae5e9134248d8236e34b91b1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240620/202406200820.Wms9UPDw-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/202406200820.Wms9UPDw-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/mailbox/cv1800b-mailbox.c:83:12: warning: cast to smaller integer type 'int' from 'void *' [-Wvoid-pointer-to-int-cast]
      83 |         int idx = (int)chan->con_priv;
         |                   ^~~~~~~~~~~~~~~~~~~
>> drivers/mailbox/cv1800b-mailbox.c:160:34: warning: cast to 'void *' from smaller integer type 'int' [-Wint-to-void-pointer-cast]
     160 |                 mb->mbox.chans[idx].con_priv = (void *)idx;
         |                                                ^~~~~~~~~~~
   2 warnings generated.


vim +83 drivers/mailbox/cv1800b-mailbox.c

    79	
    80	static int cv1800b_mbox_send_data(struct mbox_chan *chan, void *data)
    81	{
    82		struct cv1800b_mbox *mbox = dev_get_drvdata(chan->mbox->dev);
  > 83		int idx = (int)chan->con_priv;
    84		u8 en, valid;
    85		u64 *addr = (u64 *)(mbox->mbox_base + MAILBOX_CONTEXT_OFFSET) + idx;
    86	
    87		memcpy_toio(addr, data, 8);
    88	
    89		valid = 1 << idx;
    90		writeb(valid, mbox->mbox_base + MBOX_SET_CLR_REG(mbox->sendto));
    91		en = readb(mbox->mbox_base + MBOX_EN_REG(mbox->sendto));
    92		writeb(en | valid, mbox->mbox_base + MBOX_EN_REG(mbox->sendto));
    93		writeb(valid, mbox->mbox_base + MBOX_SET_REG);
    94	
    95		return 0;
    96	}
    97	
    98	static bool cv1800b_last_tx_done(struct mbox_chan *chan)
    99	{
   100		return true;
   101	}
   102	
   103	static const struct mbox_chan_ops cv1800b_mbox_chan_ops = {
   104		.send_data = cv1800b_mbox_send_data,
   105		.last_tx_done = cv1800b_last_tx_done,
   106	};
   107	
   108	static const struct of_device_id cv1800b_mbox_of_match[] = {
   109		{ .compatible = "sophgo,cv1800b-mailbox", },
   110		{},
   111	};
   112	MODULE_DEVICE_TABLE(of, cv1800b_mbox_of_match);
   113	
   114	static int cv1800b_mbox_probe(struct platform_device *pdev)
   115	{
   116		struct device *dev = &pdev->dev;
   117		struct cv1800b_mbox *mb;
   118		int irq, idx, err, cpu;
   119	
   120		if (!dev->of_node)
   121			return -ENODEV;
   122	
   123		mb = devm_kzalloc(dev, sizeof(*mb), GFP_KERNEL);
   124		if (!mb)
   125			return -ENOMEM;
   126	
   127		mb->mbox_base = devm_of_iomap(dev, dev->of_node, 0, NULL);
   128		if (IS_ERR(mb->mbox_base))
   129			return dev_err_probe(dev, PTR_ERR(mb->mbox_base),
   130					     "Failed to map resource\n");
   131	
   132		err = of_property_read_s32(dev->of_node, "sendto", &cpu);
   133		if (err)
   134			return dev_err_probe(dev, err,
   135					     "Failed to find <sendto> in of_node\n");
   136	
   137		mb->sendto = cpu;
   138	
   139		err = of_property_read_s32(dev->of_node, "recvid", &cpu);
   140		if (err) {
   141			return dev_err_probe(dev, err,
   142					     "Failed to find <recvid> in of_node\n");
   143		}
   144		mb->recvid = cpu;
   145	
   146		mb->mbox.dev = dev;
   147		mb->mbox.num_chans = MAILBOX_MAX_CHAN;
   148		mb->mbox.chans = mb->chans;
   149		mb->mbox.ops = &cv1800b_mbox_chan_ops;
   150		mb->mbox.txdone_poll = true;
   151	
   152		irq = platform_get_irq_byname(pdev, "mailbox");
   153		err = devm_request_threaded_irq(dev, irq, cv1800b_mbox_irq,
   154						cv1800b_mbox_isr, IRQF_ONESHOT,
   155						dev_name(&pdev->dev), mb);
   156		if (err < 0)
   157			return dev_err_probe(dev, err, "Failed to register irq\n");
   158	
   159		for (idx = 0; idx < MAILBOX_MAX_CHAN; idx++)
 > 160			mb->mbox.chans[idx].con_priv = (void *)idx;
   161	
   162		err = devm_mbox_controller_register(dev, &mb->mbox);
   163		if (err)
   164			return dev_err_probe(dev, err, "Failed to register mailbox\n");
   165	
   166		platform_set_drvdata(pdev, mb);
   167		return 0;
   168	}
   169	

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