Re: [PATCH v1 4/4] usb: host: xhci-tegra: Switch to use %ptT

[Thierry Reding]

On Fri, Jan 04, 2019 at 09:30:09PM +0200, Andy Shevchenko wrote:
> Use %ptT instead of open coded variant to print content of
> time64_t type in human readable format.
> 
> Cc: Mathias Nyman <mathias.ny...@intel.com>
> Cc: Thierry Reding <thierry.red...@gmail.com>
> Cc: Jonathan Hunter <jonath...@nvidia.com>
> Signed-off-by: Andy Shevchenko <andriy.shevche...@linux.intel.com>
> ---
>  drivers/usb/host/xhci-tegra.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
> 
> diff --git a/drivers/usb/host/xhci-tegra.c b/drivers/usb/host/xhci-tegra.c
> index 938ff06c0349..ed3eea3876e2 100644
> --- a/drivers/usb/host/xhci-tegra.c
> +++ b/drivers/usb/host/xhci-tegra.c
> @@ -820,7 +820,6 @@ static int tegra_xusb_load_firmware(struct tegra_xusb 
> *tegra)
>       const struct firmware *fw;
>       unsigned long timeout;
>       time64_t timestamp;
> -     struct tm time;
>       u64 address;
>       u32 value;
>       int err;
> @@ -925,11 +924,8 @@ static int tegra_xusb_load_firmware(struct tegra_xusb 
> *tegra)
>       }
>  
>       timestamp = le32_to_cpu(header->fwimg_created_time);
> -     time64_to_tm(timestamp, 0, &time);
>  
> -     dev_info(dev, "Firmware timestamp: %ld-%02d-%02d %02d:%02d:%02d UTC\n",
> -              time.tm_year + 1900, time.tm_mon + 1, time.tm_mday,
> -              time.tm_hour, time.tm_min, time.tm_sec);
> +     dev_info(dev, "Firmware timestamp: %ptT UTC\n", &timestamp);

If I understand correctly, this will now print:

        Firmware timestamp: YYYY-mm-ddTHH:MM:SS UTC

whereas it earlier printed:

        Firmware timestamp: YYYY-mm-dd HH:MM:SS UTC

So the 'T' character is different now. Could we make this something
along the lines of:

        dev_info(dev, "Firmware timestamp: %ptTd %ptTt UTC\n", &timestamp,
                 &timestamp);

To keep the output identical? It's possible that there are some scripts
that parse the log to find out which firmware was loaded.

Thierry

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