linux-kernel - Re: [PATCHv7 3/3] misc: gehc-achc: new driver

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Date:   Wed, 21 Jul 2021 18:13:44 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Sebastian Reichel <sebastian.reichel@...labora.com>
Cc:     Mark Brown <broonie@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>, Ian Ray <ian.ray@...com>,
        linux-kernel@...r.kernel.org, linux-spi@...r.kernel.org,
        devicetree@...r.kernel.org, kernel@...labora.com
Subject: Re: [PATCHv7 3/3] misc: gehc-achc: new driver

On Tue, Jul 13, 2021 at 06:35:28PM +0200, Sebastian Reichel wrote:
> General Electric Healthcare's PPD has a secondary processor from
> NXP's Kinetis K20 series. That device has two SPI chip selects:
> 
> The main interface's behaviour depends on the loaded firmware
> and is currently unused.
> 
> The secondary interface can be used to update the firmware using
> EzPort protocol. This is implemented by this driver using the
> kernel's firmware API. The firmware is being flashed into
> non-volatile flash memory, so it is enough to flash it once
> and not on every boot. Flashing will wear the flash memory
> (it has a life time of at least 10k programming cycles) and
> takes 3 minutes with the microcontroller being unusable. At
> the same time only occasional FW updates are expected (like e.g.
> a BIOS update). Thus the firmware update is triggered via sysfs
> instead of doing it in the driver's probe routine like many
> other drivers.
> 
> Signed-off-by: Sebastian Reichel <sebastian.reichel@...labora.com>
> ---
>  .../ABI/testing/sysfs-driver-ge-achc          |  14 +
>  drivers/misc/Kconfig                          |  11 +
>  drivers/misc/Makefile                         |   1 +
>  drivers/misc/gehc-achc.c                      | 542 ++++++++++++++++++
>  drivers/spi/spidev.c                          |   1 -
>  5 files changed, 568 insertions(+), 1 deletion(-)
>  create mode 100644 Documentation/ABI/testing/sysfs-driver-ge-achc
>  create mode 100644 drivers/misc/gehc-achc.c

This patch gives me build warnings:

drivers/misc/gehc-achc.c: In function ‘ezport_firmware_compare_data’:
./include/linux/minmax.h:20:35: warning: comparison of distinct pointer types lacks a cast
   20 |         (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
      |                                   ^~
./include/linux/minmax.h:26:18: note: in expansion of macro ‘__typecheck’
   26 |                 (__typecheck(x, y) && __no_side_effects(x, y))
      |                  ^~~~~~~~~~~
./include/linux/minmax.h:36:31: note: in expansion of macro ‘__safe_cmp’
   36 |         __builtin_choose_expr(__safe_cmp(x, y), \
      |                               ^~~~~~~~~~
./include/linux/minmax.h:45:25: note: in expansion of macro ‘__careful_cmp’
   45 | #define min(x, y)       __careful_cmp(x, y, <)
      |                         ^~~~~~~~~~~~~
drivers/misc/gehc-achc.c:305:33: note: in expansion of macro ‘min’
  305 |                 transfer_size = min((u32) EZPORT_TRANSFER_SIZE, size - address);
      |                                 ^~~
drivers/misc/gehc-achc.c: In function ‘ezport_firmware_flash_data’:
./include/linux/minmax.h:20:35: warning: comparison of distinct pointer types lacks a cast
   20 |         (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
      |                                   ^~
./include/linux/minmax.h:26:18: note: in expansion of macro ‘__typecheck’
   26 |                 (__typecheck(x, y) && __no_side_effects(x, y))
      |                  ^~~~~~~~~~~
./include/linux/minmax.h:36:31: note: in expansion of macro ‘__safe_cmp’
   36 |         __builtin_choose_expr(__safe_cmp(x, y), \
      |                               ^~~~~~~~~~
./include/linux/minmax.h:45:25: note: in expansion of macro ‘__careful_cmp’
   45 | #define min(x, y)       __careful_cmp(x, y, <)
      |                         ^~~~~~~~~~~~~
drivers/misc/gehc-achc.c:347:33: note: in expansion of macro ‘min’
  347 |                 transfer_size = min((u32) EZPORT_TRANSFER_SIZE, size - address);
      |                                 ^~~


How did you test build this?

thanks,

greg k-h