From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andy Shevchenko Date: Mon, 4 Mar 2024 14:27:03 +0200 Subject: [PATCH v3 02/14] serial: core: Add UPIO_UNKNOWN constant for unknown port type In-Reply-To: <20240304123035.758700-1-andriy.shevchenko@linux.intel.com> References: <20240304123035.758700-1-andriy.shevchenko@linux.intel.com> Message-ID: <20240304123035.758700-3-andriy.shevchenko@linux.intel.com> List-Id: To: linux-aspeed@lists.ozlabs.org MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit In some APIs we would like to assign the special value to iotype and compare against it in another places. Introduce UPIO_UNKNOWN for this purpose. Note, we can't use 0, because it's a valid value for IO port access. Signed-off-by: Andy Shevchenko --- include/linux/serial_core.h | 1 + 1 file changed, 1 insertion(+) diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h index 2d2ec99eca93..c2cf9484014c 100644 --- a/include/linux/serial_core.h +++ b/include/linux/serial_core.h @@ -470,6 +470,7 @@ struct uart_port { unsigned char iotype; /* io access style */ +#define UPIO_UNKNOWN ((unsigned char)~0U) /* UCHAR_MAX */ #define UPIO_PORT (SERIAL_IO_PORT) /* 8b I/O port access */ #define UPIO_HUB6 (SERIAL_IO_HUB6) /* Hub6 ISA card */ #define UPIO_MEM (SERIAL_IO_MEM) /* driver-specific */ -- 2.43.0.rc1.1.gbec44491f096