From 7978b8c385a86f0b5b9304e81a1dfb5dcaf21528 Mon Sep 17 00:00:00 2001 From: Brian Niebuhr Date: Fri, 13 Aug 2010 10:11:03 +0530 Subject: spi: davinci: enable both activation and deactivation of chip-selects Let davinci_spi_chipselect() perform both activation and deactivation of chip selects. This lets spi_bitbang fully control chip select activation, as intended by the SPI API. With this change, the chip select activation code need not be duplicated in davinci_spi_bufs_{pio|dma}(). Also, keeping chip select active control is removed as a platform data and simply controlled using information from spi_bitbang on whether chip slect should be activated or de-activated. Signed-off-by: Brian Niebuhr Tested-By: Michael Williamson Signed-off-by: Sekhar Nori --- arch/arm/mach-davinci/dm355.c | 1 - arch/arm/mach-davinci/dm365.c | 1 - arch/arm/mach-davinci/include/mach/spi.h | 1 - 3 files changed, 3 deletions(-) (limited to 'arch/arm/mach-davinci') diff --git a/arch/arm/mach-davinci/dm355.c b/arch/arm/mach-davinci/dm355.c index 9be261beae7d..6a76dfa60ef7 100644 --- a/arch/arm/mach-davinci/dm355.c +++ b/arch/arm/mach-davinci/dm355.c @@ -413,7 +413,6 @@ static struct davinci_spi_platform_data dm355_spi0_pdata = { .version = SPI_VERSION_1, .num_chipselect = 2, .clk_internal = 1, - .cs_hold = 1, .intr_level = 0, .poll_mode = 1, /* 0 -> interrupt mode 1-> polling mode */ .c2tdelay = 0, diff --git a/arch/arm/mach-davinci/dm365.c b/arch/arm/mach-davinci/dm365.c index a12065e87266..cd623db8d7d7 100644 --- a/arch/arm/mach-davinci/dm365.c +++ b/arch/arm/mach-davinci/dm365.c @@ -626,7 +626,6 @@ static struct davinci_spi_platform_data dm365_spi0_pdata = { .version = SPI_VERSION_1, .num_chipselect = 2, .clk_internal = 1, - .cs_hold = 1, .intr_level = 0, .poll_mode = 1, /* 0 -> interrupt mode 1-> polling mode */ .c2tdelay = 0, diff --git a/arch/arm/mach-davinci/include/mach/spi.h b/arch/arm/mach-davinci/include/mach/spi.h index 910efbf099c0..2cb326e536bb 100644 --- a/arch/arm/mach-davinci/include/mach/spi.h +++ b/arch/arm/mach-davinci/include/mach/spi.h @@ -33,7 +33,6 @@ struct davinci_spi_platform_data { u8 wait_enable; u8 timer_disable; u8 clk_internal; - u8 cs_hold; u8 intr_level; u8 poll_mode; u8 use_dma; -- cgit v1.2.1 From 23853973d9b76eb8b3cf46157689bc6187e141d9 Mon Sep 17 00:00:00 2001 From: Brian Niebuhr Date: Fri, 13 Aug 2010 10:57:44 +0530 Subject: spi: davinci: enable GPIO lines to be used as chip selects Sometimes, the chip selects provided by SPI module are muxed with other functionality and cannot be used in some designs. In such cases, it becomes convenient to use an available GPIO line as chip select. This patch enables the DaVinci SPI driver to treat specific GPIO lines as chip selects based on information provided in platform data. Signed-off-by: Brian Niebuhr Tested-By: Michael Williamson Signed-off-by: Sekhar Nori --- arch/arm/mach-davinci/include/mach/spi.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'arch/arm/mach-davinci') diff --git a/arch/arm/mach-davinci/include/mach/spi.h b/arch/arm/mach-davinci/include/mach/spi.h index 2cb326e536bb..734d1fb99614 100644 --- a/arch/arm/mach-davinci/include/mach/spi.h +++ b/arch/arm/mach-davinci/include/mach/spi.h @@ -19,6 +19,8 @@ #ifndef __ARCH_ARM_DAVINCI_SPI_H #define __ARCH_ARM_DAVINCI_SPI_H +#define SPI_INTERN_CS 0xFF + enum { SPI_VERSION_1, /* For DM355/DM365/DM6467 */ SPI_VERSION_2, /* For DA8xx */ @@ -38,6 +40,7 @@ struct davinci_spi_platform_data { u8 use_dma; u8 c2tdelay; u8 t2cdelay; + u8 *chip_sel; }; #endif /* __ARCH_ARM_DAVINCI_SPI_H */ -- cgit v1.2.1 From 472880c73da124b6cb5cbc31a36754aa62935afe Mon Sep 17 00:00:00 2001 From: Brian Niebuhr Date: Mon, 16 Aug 2010 10:28:53 +0530 Subject: spi: davinci: remove 'wait_enable' platform data member The SPI_READY bit of struct spi_device:mode serves the purpose of letting the SPI master know if the slave can signal if it is ready for transfer or not. The 'wait_enable' platform data was duplicating this functionality. Use the framework provided method of indicating this capability. Signed-off-by: Brian Niebuhr Tested-By: Michael Williamson Signed-off-by: Sekhar Nori --- arch/arm/mach-davinci/include/mach/spi.h | 1 - 1 file changed, 1 deletion(-) (limited to 'arch/arm/mach-davinci') diff --git a/arch/arm/mach-davinci/include/mach/spi.h b/arch/arm/mach-davinci/include/mach/spi.h index 734d1fb99614..fe699140269c 100644 --- a/arch/arm/mach-davinci/include/mach/spi.h +++ b/arch/arm/mach-davinci/include/mach/spi.h @@ -32,7 +32,6 @@ struct davinci_spi_platform_data { u8 wdelay; u8 odd_parity; u8 parity_enable; - u8 wait_enable; u8 timer_disable; u8 clk_internal; u8 intr_level; -- cgit v1.2.1 From 53a31b07c5aea4001bbb36ddd5ef2addffc7ccbd Mon Sep 17 00:00:00 2001 From: Brian Niebuhr Date: Mon, 16 Aug 2010 15:05:51 +0530 Subject: spi: davinci: make chip-slect specific parameters really chip-select specific Some chip-select specific paramterers like wdelay, parity, usage of chip-select timers (and the actual timer values) are included in platform data forcing the same behaviour across all chip-selects. Create a new davinci_spi_config data structure which can be passed along using controller_data member of spi_device data structure on a per-device basis. Signed-off-by: Brian Niebuhr Tested-By: Michael Williamson Signed-off-by: Sekhar Nori --- arch/arm/mach-davinci/dm355.c | 3 --- arch/arm/mach-davinci/dm365.c | 3 --- arch/arm/mach-davinci/include/mach/spi.h | 13 ++++++++----- 3 files changed, 8 insertions(+), 11 deletions(-) (limited to 'arch/arm/mach-davinci') diff --git a/arch/arm/mach-davinci/dm355.c b/arch/arm/mach-davinci/dm355.c index 6a76dfa60ef7..a6d9b72190ff 100644 --- a/arch/arm/mach-davinci/dm355.c +++ b/arch/arm/mach-davinci/dm355.c @@ -413,10 +413,7 @@ static struct davinci_spi_platform_data dm355_spi0_pdata = { .version = SPI_VERSION_1, .num_chipselect = 2, .clk_internal = 1, - .intr_level = 0, .poll_mode = 1, /* 0 -> interrupt mode 1-> polling mode */ - .c2tdelay = 0, - .t2cdelay = 0, }; static struct platform_device dm355_spi0_device = { .name = "spi_davinci", diff --git a/arch/arm/mach-davinci/dm365.c b/arch/arm/mach-davinci/dm365.c index cd623db8d7d7..80dd159134cb 100644 --- a/arch/arm/mach-davinci/dm365.c +++ b/arch/arm/mach-davinci/dm365.c @@ -626,10 +626,7 @@ static struct davinci_spi_platform_data dm365_spi0_pdata = { .version = SPI_VERSION_1, .num_chipselect = 2, .clk_internal = 1, - .intr_level = 0, .poll_mode = 1, /* 0 -> interrupt mode 1-> polling mode */ - .c2tdelay = 0, - .t2cdelay = 0, }; static struct resource dm365_spi0_resources[] = { diff --git a/arch/arm/mach-davinci/include/mach/spi.h b/arch/arm/mach-davinci/include/mach/spi.h index fe699140269c..29c19c425b02 100644 --- a/arch/arm/mach-davinci/include/mach/spi.h +++ b/arch/arm/mach-davinci/include/mach/spi.h @@ -29,17 +29,20 @@ enum { struct davinci_spi_platform_data { u8 version; u8 num_chipselect; - u8 wdelay; - u8 odd_parity; - u8 parity_enable; - u8 timer_disable; u8 clk_internal; u8 intr_level; u8 poll_mode; u8 use_dma; + u8 *chip_sel; +}; + +struct davinci_spi_config { + u8 wdelay; + u8 odd_parity; + u8 parity_enable; + u8 timer_disable; u8 c2tdelay; u8 t2cdelay; - u8 *chip_sel; }; #endif /* __ARCH_ARM_DAVINCI_SPI_H */ -- cgit v1.2.1 From 7abbf23c5903e14b0cff1cdeab906eab164be767 Mon Sep 17 00:00:00 2001 From: Brian Niebuhr Date: Thu, 19 Aug 2010 15:07:38 +0530 Subject: spi: davinci: add support for wait enable timeouts Just enabling WAITENA in SPIFMTn register waits for the enable signal from the slave indefinitely. Allow support for finite waiting by adding support for c2e delay (maximum time for addressed slave to respond) and t2e delay (maximum time for slave to respond after transmit data finished). While at it, modify the T2C and C2T defines by prepending the register name as is the convention followed for other register field elsewhere in the driver. Signed-off-by: Brian Niebuhr Tested-By: Michael Williamson Signed-off-by: Sekhar Nori --- arch/arm/mach-davinci/include/mach/spi.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'arch/arm/mach-davinci') diff --git a/arch/arm/mach-davinci/include/mach/spi.h b/arch/arm/mach-davinci/include/mach/spi.h index 29c19c425b02..483b055da440 100644 --- a/arch/arm/mach-davinci/include/mach/spi.h +++ b/arch/arm/mach-davinci/include/mach/spi.h @@ -43,6 +43,8 @@ struct davinci_spi_config { u8 timer_disable; u8 c2tdelay; u8 t2cdelay; + u8 t2edelay; + u8 c2edelay; }; #endif /* __ARCH_ARM_DAVINCI_SPI_H */ -- cgit v1.2.1 From cf90fe73504764cbcc2552c7ea69b1866059db30 Mon Sep 17 00:00:00 2001 From: Brian Niebuhr Date: Fri, 20 Aug 2010 17:02:49 +0530 Subject: spi: davinci: remove non-useful interrupt mode support The interrupt mode support as it stands is another version of poll mode. Even when interrupt mode is selected, the code tight loops on interrupt status register, rendering it totally useless. A completion variable is initialized, but never used. Remove this fake interrupt mode since users can anyway use poll mode with no functional difference. A usefully implemented interrupt mode support can be added later. Signed-off-by: Brian Niebuhr Tested-By: Michael Williamson Signed-off-by: Sekhar Nori --- arch/arm/mach-davinci/dm355.c | 1 - arch/arm/mach-davinci/dm365.c | 1 - arch/arm/mach-davinci/include/mach/spi.h | 2 -- 3 files changed, 4 deletions(-) (limited to 'arch/arm/mach-davinci') diff --git a/arch/arm/mach-davinci/dm355.c b/arch/arm/mach-davinci/dm355.c index a6d9b72190ff..e311f29ffb57 100644 --- a/arch/arm/mach-davinci/dm355.c +++ b/arch/arm/mach-davinci/dm355.c @@ -413,7 +413,6 @@ static struct davinci_spi_platform_data dm355_spi0_pdata = { .version = SPI_VERSION_1, .num_chipselect = 2, .clk_internal = 1, - .poll_mode = 1, /* 0 -> interrupt mode 1-> polling mode */ }; static struct platform_device dm355_spi0_device = { .name = "spi_davinci", diff --git a/arch/arm/mach-davinci/dm365.c b/arch/arm/mach-davinci/dm365.c index 80dd159134cb..1e5012e196ba 100644 --- a/arch/arm/mach-davinci/dm365.c +++ b/arch/arm/mach-davinci/dm365.c @@ -626,7 +626,6 @@ static struct davinci_spi_platform_data dm365_spi0_pdata = { .version = SPI_VERSION_1, .num_chipselect = 2, .clk_internal = 1, - .poll_mode = 1, /* 0 -> interrupt mode 1-> polling mode */ }; static struct resource dm365_spi0_resources[] = { diff --git a/arch/arm/mach-davinci/include/mach/spi.h b/arch/arm/mach-davinci/include/mach/spi.h index 483b055da440..e68afe23885b 100644 --- a/arch/arm/mach-davinci/include/mach/spi.h +++ b/arch/arm/mach-davinci/include/mach/spi.h @@ -30,8 +30,6 @@ struct davinci_spi_platform_data { u8 version; u8 num_chipselect; u8 clk_internal; - u8 intr_level; - u8 poll_mode; u8 use_dma; u8 *chip_sel; }; -- cgit v1.2.1 From e0d205e9914476e96596c5339fa440fb314ef03b Mon Sep 17 00:00:00 2001 From: Brian Niebuhr Date: Thu, 2 Sep 2010 16:52:06 +0530 Subject: spi: davinci: add support for interrupt mode Add support for SPI interrupt mode operation. Define a per chip-select "io type" variable which specifies if the transfers on this chip-select should happen in interrupt mode or polled mode. Introduce a new function davinci_spi_process_events() to help consolidate the code between interrupt mode processing and polled mode processing. Signed-off-by: Brian Niebuhr Tested-By: Michael Williamson Signed-off-by: Sekhar Nori --- arch/arm/mach-davinci/include/mach/spi.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'arch/arm/mach-davinci') diff --git a/arch/arm/mach-davinci/include/mach/spi.h b/arch/arm/mach-davinci/include/mach/spi.h index e68afe23885b..ab45b89a0c5f 100644 --- a/arch/arm/mach-davinci/include/mach/spi.h +++ b/arch/arm/mach-davinci/include/mach/spi.h @@ -30,6 +30,7 @@ struct davinci_spi_platform_data { u8 version; u8 num_chipselect; u8 clk_internal; + u8 intr_line; u8 use_dma; u8 *chip_sel; }; @@ -38,6 +39,9 @@ struct davinci_spi_config { u8 wdelay; u8 odd_parity; u8 parity_enable; +#define SPI_IO_TYPE_INTR 0 +#define SPI_IO_TYPE_POLL 1 + u8 io_type; u8 timer_disable; u8 c2tdelay; u8 t2cdelay; -- cgit v1.2.1 From c29e3c60e75d1cc1262ac8af379738b6fd851f33 Mon Sep 17 00:00:00 2001 From: Brian Niebuhr Date: Tue, 28 Sep 2010 13:59:26 +0530 Subject: spi: davinci: always start transmit DMA Due to the full duplex nature of the SPI bus, the SPI master on DaVinci needs transmit to be active even if the tranfer is only meant to collect receive data. The current code achieves this by using a temporary zeroed buffer to provide DMA data in case the transfer does not have a transmit buffer provided. However, the transmit DMA is started only if transmit buffer is provided rendering the temporary buffer unused. Instead the code relies on a write to SPIDAT1 register to trigger transmit operation. This however only sends two bytes of data. Fix this by starting transmit DMA always. This changes exposes a bug on DM355 where the CSHOLD bit in SPIDAT1 needs to be written to in between transfers. Handle that by introducing a "cshold_bug" platform data which is set to true for DM355. Signed-off-by: Brian Niebuhr Tested-By: Michael Williamson Signed-off-by: Sekhar Nori --- arch/arm/mach-davinci/dm355.c | 1 + arch/arm/mach-davinci/include/mach/spi.h | 1 + 2 files changed, 2 insertions(+) (limited to 'arch/arm/mach-davinci') diff --git a/arch/arm/mach-davinci/dm355.c b/arch/arm/mach-davinci/dm355.c index e311f29ffb57..27ee870b2d27 100644 --- a/arch/arm/mach-davinci/dm355.c +++ b/arch/arm/mach-davinci/dm355.c @@ -413,6 +413,7 @@ static struct davinci_spi_platform_data dm355_spi0_pdata = { .version = SPI_VERSION_1, .num_chipselect = 2, .clk_internal = 1, + .cshold_bug = true, }; static struct platform_device dm355_spi0_device = { .name = "spi_davinci", diff --git a/arch/arm/mach-davinci/include/mach/spi.h b/arch/arm/mach-davinci/include/mach/spi.h index ab45b89a0c5f..68db6d5daaf4 100644 --- a/arch/arm/mach-davinci/include/mach/spi.h +++ b/arch/arm/mach-davinci/include/mach/spi.h @@ -33,6 +33,7 @@ struct davinci_spi_platform_data { u8 intr_line; u8 use_dma; u8 *chip_sel; + bool cshold_bug; }; struct davinci_spi_config { -- cgit v1.2.1 From 903ca25b219e28e3513ca4c2ff379fcdf19e057e Mon Sep 17 00:00:00 2001 From: Sekhar Nori Date: Fri, 1 Oct 2010 14:51:40 +0530 Subject: spi: davinci: do not allocate DMA channels during SPI device setup Do not allocate (and de-allocate) SPI DMA channels during setup (and cleanup) for each SPI device. Instead, allocate the DMA channels once duing probe and use them for the life time of the driver. This makes sense since there are dedicated DMA channels meant for SPI use. This also helps remove the unnecessary DMA "sync_dev" variables being used to store DMA channel information. Also, the "use_dma" platform variable is now eliminated since it is possible to check if the platform supports DMA or not based upon whether DMA resources can be found or not. Tested-By: Michael Williamson Tested-By: Brian Niebuhr Signed-off-by: Sekhar Nori --- arch/arm/mach-davinci/include/mach/spi.h | 1 - 1 file changed, 1 deletion(-) (limited to 'arch/arm/mach-davinci') diff --git a/arch/arm/mach-davinci/include/mach/spi.h b/arch/arm/mach-davinci/include/mach/spi.h index 68db6d5daaf4..f7586a03678c 100644 --- a/arch/arm/mach-davinci/include/mach/spi.h +++ b/arch/arm/mach-davinci/include/mach/spi.h @@ -31,7 +31,6 @@ struct davinci_spi_platform_data { u8 num_chipselect; u8 clk_internal; u8 intr_line; - u8 use_dma; u8 *chip_sel; bool cshold_bug; }; -- cgit v1.2.1 From 87467bd9052725283b9a9f4b1b310fed8744fb1e Mon Sep 17 00:00:00 2001 From: Brian Niebuhr Date: Wed, 6 Oct 2010 17:03:10 +0530 Subject: spi: davinci: let DMA operation be specified on per-device basis Let DMA operation be specified on a per-device basis instead of selecting it once during probe. A side effect of this is the need to combine the PIO and DMA buffer txrx_bufs routine. This is good since they anyway share some common functionality. Signed-off-by: Brian Niebuhr Tested-By: Michael Williamson Signed-off-by: Sekhar Nori --- arch/arm/mach-davinci/include/mach/spi.h | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/arm/mach-davinci') diff --git a/arch/arm/mach-davinci/include/mach/spi.h b/arch/arm/mach-davinci/include/mach/spi.h index f7586a03678c..b3ab7d04943a 100644 --- a/arch/arm/mach-davinci/include/mach/spi.h +++ b/arch/arm/mach-davinci/include/mach/spi.h @@ -41,6 +41,7 @@ struct davinci_spi_config { u8 parity_enable; #define SPI_IO_TYPE_INTR 0 #define SPI_IO_TYPE_POLL 1 +#define SPI_IO_TYPE_DMA 2 u8 io_type; u8 timer_disable; u8 c2tdelay; -- cgit v1.2.1 From 3409e408ab0d7171ae81d198110a1f293852959f Mon Sep 17 00:00:00 2001 From: Brian Niebuhr Date: Wed, 6 Oct 2010 18:13:31 +0530 Subject: spi: davinci: remove non-useful "clk_internal" platform data The "clk_internal" platform data member which contols the CLKMOD bit in Global Control Register 1 is not useful since CLKMOD needs be set to 1 *always* to ensure master mode operation. Remove this platform data. Signed-off-by: Brian Niebuhr Tested-By: Michael Williamson Signed-off-by: Sekhar Nori --- arch/arm/mach-davinci/dm355.c | 1 - arch/arm/mach-davinci/dm365.c | 1 - arch/arm/mach-davinci/include/mach/spi.h | 1 - 3 files changed, 3 deletions(-) (limited to 'arch/arm/mach-davinci') diff --git a/arch/arm/mach-davinci/dm355.c b/arch/arm/mach-davinci/dm355.c index 27ee870b2d27..c0c501a4c139 100644 --- a/arch/arm/mach-davinci/dm355.c +++ b/arch/arm/mach-davinci/dm355.c @@ -412,7 +412,6 @@ static struct resource dm355_spi0_resources[] = { static struct davinci_spi_platform_data dm355_spi0_pdata = { .version = SPI_VERSION_1, .num_chipselect = 2, - .clk_internal = 1, .cshold_bug = true, }; static struct platform_device dm355_spi0_device = { diff --git a/arch/arm/mach-davinci/dm365.c b/arch/arm/mach-davinci/dm365.c index 1e5012e196ba..8b8204fa7578 100644 --- a/arch/arm/mach-davinci/dm365.c +++ b/arch/arm/mach-davinci/dm365.c @@ -625,7 +625,6 @@ static u64 dm365_spi0_dma_mask = DMA_BIT_MASK(32); static struct davinci_spi_platform_data dm365_spi0_pdata = { .version = SPI_VERSION_1, .num_chipselect = 2, - .clk_internal = 1, }; static struct resource dm365_spi0_resources[] = { diff --git a/arch/arm/mach-davinci/include/mach/spi.h b/arch/arm/mach-davinci/include/mach/spi.h index b3ab7d04943a..1f8b7866bea3 100644 --- a/arch/arm/mach-davinci/include/mach/spi.h +++ b/arch/arm/mach-davinci/include/mach/spi.h @@ -29,7 +29,6 @@ enum { struct davinci_spi_platform_data { u8 version; u8 num_chipselect; - u8 clk_internal; u8 intr_line; u8 *chip_sel; bool cshold_bug; -- cgit v1.2.1 From 035540f6ea2394bdd9675552d31e1125cd0e402e Mon Sep 17 00:00:00 2001 From: Brian Niebuhr Date: Wed, 6 Oct 2010 18:32:40 +0530 Subject: spi: davinci: add additional comments Add comments describing the platform data members and per-chip-select SPI configuration structure. Also, add some comments describing the what happens during the driver probe. Signed-off-by: Brian Niebuhr Tested-By: Michael Williamson Signed-off-by: Sekhar Nori --- arch/arm/mach-davinci/include/mach/spi.h | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) (limited to 'arch/arm/mach-davinci') diff --git a/arch/arm/mach-davinci/include/mach/spi.h b/arch/arm/mach-davinci/include/mach/spi.h index 1f8b7866bea3..38f4da5ca135 100644 --- a/arch/arm/mach-davinci/include/mach/spi.h +++ b/arch/arm/mach-davinci/include/mach/spi.h @@ -26,6 +26,20 @@ enum { SPI_VERSION_2, /* For DA8xx */ }; +/** + * davinci_spi_platform_data - Platform data for SPI master device on DaVinci + * + * @version: version of the SPI IP. Different DaVinci devices have slightly + * varying versions of the same IP. + * @num_chipselect: number of chipselects supported by this SPI master + * @intr_line: interrupt line used to connect the SPI IP to the ARM interrupt + * controller withn the SoC. Possible values are 0 and 1. + * @chip_sel: list of GPIOs which can act as chip-selects for the SPI. + * SPI_INTERN_CS denotes internal SPI chip-select. Not necessary + * to populate if all chip-selects are internal. + * @cshold_bug: set this to true if the SPI controller on your chip requires + * a write to CSHOLD bit in between transfers (like in DM355). + */ struct davinci_spi_platform_data { u8 version; u8 num_chipselect; @@ -34,6 +48,24 @@ struct davinci_spi_platform_data { bool cshold_bug; }; +/** + * davinci_spi_config - Per-chip-select configuration for SPI slave devices + * + * @wdelay: amount of delay between transmissions. Measured in number of + * SPI module clocks. + * @odd_parity: polarity of parity flag at the end of transmit data stream. + * 0 - odd parity, 1 - even parity. + * @parity_enable: enable transmission of parity at end of each transmit + * data stream. + * @io_type: type of IO transfer. Choose between polled, interrupt and DMA. + * @timer_disable: disable chip-select timers (setup and hold) + * @c2tdelay: chip-select setup time. Measured in number of SPI module clocks. + * @t2cdelay: chip-select hold time. Measured in number of SPI module clocks. + * @t2edelay: transmit data finished to SPI ENAn pin inactive time. Measured + * in number of SPI clocks. + * @c2edelay: chip-select active to SPI ENAn signal active time. Measured in + * number of SPI clocks. + */ struct davinci_spi_config { u8 wdelay; u8 odd_parity; -- cgit v1.2.1