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spi: dw: Add support for master mode selection for DWC SSI controller

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Add support to select the controller mode as master mode by setting Bit 31
of CTRLR0 register. This feature is supported for controller versions above
v1.02.

Signed-off-by: Nandhini Srikandan <nandhini.srikandan@intel.com>
Acked-by: Serge Semin <fancer.lancer@gmail.com>
Link: https://lore.kernel.org/r/20220713042223.1458-4-nandhini.srikandan@intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Nandhini Srikandan 2022-07-13 12:22:22 +08:00 committed by Mark Brown
parent 0d085723c6
commit 51e41dc2f2
No known key found for this signature in database
GPG key ID: 24D68B725D5487D0
2 changed files with 4 additions and 9 deletions
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5
drivers/spi/spi-dw-core.c
View file

@ -307,8 +307,9 @@ static u32 dw_spi_prepare_cr0(struct dw_spi *dws, struct spi_device *spi)
if (spi->mode & SPI_LOOP)
cr0 |= DW_HSSI_CTRLR0_SRL;
if (dws->caps & DW_SPI_CAP_KEEMBAY_MST)
cr0 |= DW_HSSI_CTRLR0_KEEMBAY_MST;
/* CTRLR0[31] MST */
if (dw_spi_ver_is_ge(dws, HSSI, 102A))
cr0 |= DW_HSSI_CTRLR0_MST;
}
return cr0;

8
drivers/spi/spi-dw.h
View file

@ -94,13 +94,7 @@
#define DW_HSSI_CTRLR0_SCPOL BIT(9)
#define DW_HSSI_CTRLR0_TMOD_MASK GENMASK(11, 10)
#define DW_HSSI_CTRLR0_SRL BIT(13)
/*
* For Keem Bay, CTRLR0[31] is used to select controller mode.
* 0: SSI is slave
* 1: SSI is master
*/
#define DW_HSSI_CTRLR0_KEEMBAY_MST BIT(31)
#define DW_HSSI_CTRLR0_MST BIT(31)
/* Bit fields in CTRLR1 */
#define DW_SPI_NDF_MASK GENMASK(15, 0)