linux-kernel - Re: [PATCH v10 2/2] fpga: lattice machxo2: Add Lattice MachXO2 support

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Date:   Wed, 4 Apr 2018 12:34:08 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Paolo Pisati <p.pisati@...il.com>
Cc:     kbuild-all@...org, Alan Tull <atull@...nel.org>,
        Moritz Fischer <mdf@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-fpga@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v10 2/2] fpga: lattice machxo2: Add Lattice MachXO2
 support

Hi Paolo,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v4.16 next-20180403]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Paolo-Pisati/dt-bindings-fpga-add-lattice-machxo2-slave-spi-binding-description/20180404-055540
reproduce:
        # apt-get install sparse
        make ARCH=x86_64 allmodconfig
        make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

>> drivers/fpga/machxo2-spi.c:86:19: sparse: cast to restricted __be32
>> drivers/fpga/machxo2-spi.c:86:19: sparse: cast to restricted __be32
>> drivers/fpga/machxo2-spi.c:86:19: sparse: cast to restricted __be32
>> drivers/fpga/machxo2-spi.c:86:19: sparse: cast to restricted __be32
>> drivers/fpga/machxo2-spi.c:86:19: sparse: cast to restricted __be32
>> drivers/fpga/machxo2-spi.c:86:19: sparse: cast to restricted __be32
   drivers/fpga/machxo2-spi.c:369:12: sparse: no member 'parent' in struct fpga_manager
>> drivers/fpga/machxo2-spi.c:375:33: sparse: not enough arguments for function fpga_mgr_register
>> drivers/fpga/machxo2-spi.c:382:29: sparse: incorrect type in argument 1 (different base types) @@    expected struct device *dev @@    got structstruct device *dev @@
>> drivers/fpga/machxo2-spi.c:369:12: sparse: generating address of non-lvalue (8)
   drivers/fpga/machxo2-spi.c: In function 'machxo2_spi_probe':
   drivers/fpga/machxo2-spi.c:369:5: error: 'struct fpga_manager' has no member named 'parent'
     mgr->parent = dev;
        ^~
   drivers/fpga/machxo2-spi.c:375:27: error: passing argument 1 of 'fpga_mgr_register' from incompatible pointer type [-Werror=incompatible-pointer-types]
     return fpga_mgr_register(mgr);
                              ^~~
   In file included from drivers/fpga/machxo2-spi.c:12:0:
   include/linux/fpga/fpga-mgr.h:173:5: note: expected 'struct device *' but argument is of type 'struct fpga_manager *'
    int fpga_mgr_register(struct device *dev, const char *name,
        ^~~~~~~~~~~~~~~~~
   drivers/fpga/machxo2-spi.c:375:9: error: too few arguments to function 'fpga_mgr_register'
     return fpga_mgr_register(mgr);
            ^~~~~~~~~~~~~~~~~
   In file included from drivers/fpga/machxo2-spi.c:12:0:
   include/linux/fpga/fpga-mgr.h:173:5: note: declared here
    int fpga_mgr_register(struct device *dev, const char *name,
        ^~~~~~~~~~~~~~~~~
   drivers/fpga/machxo2-spi.c: In function 'machxo2_spi_remove':
   drivers/fpga/machxo2-spi.c:382:22: error: passing argument 1 of 'fpga_mgr_unregister' from incompatible pointer type [-Werror=incompatible-pointer-types]
     fpga_mgr_unregister(mgr);
                         ^~~
   In file included from drivers/fpga/machxo2-spi.c:12:0:
   include/linux/fpga/fpga-mgr.h:176:6: note: expected 'struct device *' but argument is of type 'struct fpga_manager *'
    void fpga_mgr_unregister(struct device *dev);
         ^~~~~~~~~~~~~~~~~~~
   drivers/fpga/machxo2-spi.c: In function 'machxo2_spi_probe':
   drivers/fpga/machxo2-spi.c:376:1: warning: control reaches end of non-void function [-Wreturn-type]
    }
    ^
   cc1: some warnings being treated as errors

vim +86 drivers/fpga/machxo2-spi.c

    65	
    66	static int get_status(struct spi_device *spi, unsigned long *status)
    67	{
    68		struct spi_message msg;
    69		struct spi_transfer rx, tx;
    70		static const u8 cmd[] = LSC_READ_STATUS;
    71		int ret;
    72	
    73		memset(&rx, 0, sizeof(rx));
    74		memset(&tx, 0, sizeof(tx));
    75		tx.tx_buf = cmd;
    76		tx.len = sizeof(cmd);
    77		rx.rx_buf = status;
    78		rx.len = 4;
    79		spi_message_init(&msg);
    80		spi_message_add_tail(&tx, &msg);
    81		spi_message_add_tail(&rx, &msg);
    82		ret = spi_sync(spi, &msg);
    83		if (ret)
    84			return ret;
    85	
  > 86		*status = be32_to_cpu(*status);
    87	
    88		return 0;
    89	}
    90	

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