From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm0-x242.google.com ([2a00:1450:400c:c09::242]) by bombadil.infradead.org with esmtps (Exim 4.85_2 #1 (Red Hat Linux)) id 1bWU5C-0004eb-Eg for linux-mtd@lists.infradead.org; Sun, 07 Aug 2016 19:50:04 +0000 Received: by mail-wm0-x242.google.com with SMTP id i5so11987991wmg.2 for ; Sun, 07 Aug 2016 12:49:42 -0700 (PDT) From: Heiner Kallweit Subject: [PATCH 1/3] spi: introduce max message size flag in spi_master To: Mark Brown , Brian Norris Cc: "linux-spi@vger.kernel.org" , MTD Maling List Message-ID: <6c95366c-7fcc-ef4c-033a-f9f6e152a669@gmail.com> Date: Sun, 7 Aug 2016 21:47:18 +0200 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Recently a maximum transfer size was was introduced in struct spi_master. However there are also spi controllers with a maximum message size, e.g. fsl-espi has a max message size of 64KB. As there are no (known) spi controller with differing size limits for transfer and message, introduce a flag in spi_master to indicate that the max transfer size is also the maximum message size. Signed-off-by: Heiner Kallweit --- include/linux/spi/spi.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h index 072cb2a..cadb1de 100644 --- a/include/linux/spi/spi.h +++ b/include/linux/spi/spi.h @@ -312,6 +312,8 @@ static inline void spi_unregister_driver(struct spi_driver *sdrv) * @flags: other constraints relevant to this driver * @max_transfer_size: function that returns the max transfer size for * a &spi_device; may be %NULL, so the default %SIZE_MAX will be used. + * @max_message_size_flag: indicates that max transfer size is also + * max message size * @io_mutex: mutex for physical bus access * @bus_lock_spinlock: spinlock for SPI bus locking * @bus_lock_mutex: mutex for exclusion of multiple callers @@ -446,6 +448,8 @@ struct spi_master { * the limit may depend on device transfer settings */ size_t (*max_transfer_size)(struct spi_device *spi); + /* flag indicating that max transfer size is also max message size */ + bool max_message_size_flag; /* I/O mutex */ struct mutex io_mutex; -- 2.9.2