Guenter,

Thanks for catching this!

> Fix:
> 
> drivers/i2c/busses/i2c-jz4780.c: In function 'jz4780_i2c_readw':
> drivers/i2c/busses/i2c-jz4780.c:181:2: error:
> 		implicit declaration of function 'readw'
> drivers/i2c/busses/i2c-jz4780.c: In function 'jz4780_i2c_writew':
> drivers/i2c/busses/i2c-jz4780.c:187:2: error:
> 		implicit declaration of function 'writew'
> 
> seen with sparc64:allmodconfig and m68k:allmodconfig.
> 
> The driver depends on HAS_IOMEM, and must include linux/io.h.
> 
> Fixes: ba92222ed63a ("i2c: jz4780: Add i2c bus controller driver
> 	for Ingenic JZ4780")
> Cc: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>
> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
> ---
>  drivers/i2c/busses/Kconfig      | 1 +
>  drivers/i2c/busses/i2c-jz4780.c | 1 +
>  2 files changed, 2 insertions(+)
> 
> diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
> index 2255af23b9c7..c78b6cbd1106 100644
> --- a/drivers/i2c/busses/Kconfig
> +++ b/drivers/i2c/busses/Kconfig
> @@ -586,6 +586,7 @@ config I2C_IOP3XX
>  config I2C_JZ4780
>  	tristate "JZ4780 I2C controller interface support"
>  	depends on MACH_JZ4780 || COMPILE_TEST
> +	depends on HAS_IOMEM

You sure? We have

menu "I2C Hardware Bus support"
        depends on HAS_IOMEM

in drivers/i2c/busses/Kconfig. For me, menuconfig shows that the driver
is already depending on HAS_IOMEM.

>  	help
>  	 If you say yes to this option, support will be included for the
>  	 Ingenic JZ4780 I2C controller.
> diff --git a/drivers/i2c/busses/i2c-jz4780.c b/drivers/i2c/busses/i2c-jz4780.c
> index ce1d69324169..f2761ab2ef32 100644
> --- a/drivers/i2c/busses/i2c-jz4780.c
> +++ b/drivers/i2c/busses/i2c-jz4780.c
> @@ -21,6 +21,7 @@
>  #include <linux/delay.h>
>  #include <linux/errno.h>
>  #include <linux/i2c.h>
> +#include <linux/io.h>
>  #include <linux/init.h>
>  #include <linux/interrupt.h>
>  #include <linux/kernel.h>

The sorting needs to be fixed.