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spi: altera: add SPI core parameters support via platform data.

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This patch introduced SPI core parameters in platform data, it
allows passing these SPI core parameters via platform data.

Signed-off-by: Wu Hao <hao.wu@intel.com>
Signed-off-by: Xu Yilun <yilun.xu@intel.com>
Signed-off-by: Matthew Gerlach <matthew.gerlach@linux.intel.com>
Signed-off-by: Russ Weight <russell.h.weight@intel.com>
Reviewed-by: Tom Rix <trix@redhat.com>
Link: https://lore.kernel.org/r/1591845911-10197-3-git-send-email-yilun.xu@intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Xu Yilun 2020-06-11 11:25:07 +08:00 committed by Mark Brown
parent 3011d31475
commit 8e04187c1b
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
2 changed files with 46 additions and 3 deletions
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25
drivers/spi/spi-altera.c
View File

@ -14,6 +14,7 @@
#include <linux/errno.h> #include <linux/errno.h>
#include <linux/module.h> #include <linux/module.h>
#include <linux/platform_device.h> #include <linux/platform_device.h>
#include <linux/spi/altera.h>
#include <linux/spi/spi.h> #include <linux/spi/spi.h>
#include <linux/io.h> #include <linux/io.h>
#include <linux/of.h> #include <linux/of.h>
@ -40,6 +41,8 @@
#define ALTERA_SPI_CONTROL_IE_MSK 0x100 #define ALTERA_SPI_CONTROL_IE_MSK 0x100
#define ALTERA_SPI_CONTROL_SSO_MSK 0x400 #define ALTERA_SPI_CONTROL_SSO_MSK 0x400
#define ALTERA_SPI_MAX_CS 32
struct altera_spi { struct altera_spi {
void __iomem *base; void __iomem *base;
int irq; int irq;
@ -182,6 +185,7 @@ static irqreturn_t altera_spi_irq(int irq, void *dev)
static int altera_spi_probe(struct platform_device *pdev) static int altera_spi_probe(struct platform_device *pdev)
{ {
struct altera_spi_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct altera_spi *hw; struct altera_spi *hw;
struct spi_master *master; struct spi_master *master;
int err = -ENODEV; int err = -ENODEV;
@ -192,9 +196,24 @@ static int altera_spi_probe(struct platform_device *pdev)
/* setup the master state. */ /* setup the master state. */
master->bus_num = pdev->id; master->bus_num = pdev->id;
master->num_chipselect = 16;
master->mode_bits = SPI_CS_HIGH; if (pdata) {
master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 16); if (pdata->num_chipselect > ALTERA_SPI_MAX_CS) {
dev_err(&pdev->dev,
"Invalid number of chipselect: %hu\n",
pdata->num_chipselect);
return -EINVAL;
}
master->num_chipselect = pdata->num_chipselect;
master->mode_bits = pdata->mode_bits;
master->bits_per_word_mask = pdata->bits_per_word_mask;
} else {
master->num_chipselect = 16;
master->mode_bits = SPI_CS_HIGH;
master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 16);
}
master->dev.of_node = pdev->dev.of_node; master->dev.of_node = pdev->dev.of_node;
master->transfer_one = altera_spi_txrx; master->transfer_one = altera_spi_txrx;
master->set_cs = altera_spi_set_cs; master->set_cs = altera_spi_set_cs;

24
include/linux/spi/altera.h Normal file
View File

@ -0,0 +1,24 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Header File for Altera SPI Driver.
*/
#ifndef __LINUX_SPI_ALTERA_H
#define __LINUX_SPI_ALTERA_H
#include <linux/regmap.h>
#include <linux/spi/spi.h>
#include <linux/types.h>
/**
* struct altera_spi_platform_data - Platform data of the Altera SPI driver
* @mode_bits: Mode bits of SPI master.
* @num_chipselect: Number of chipselects.
* @bits_per_word_mask: bitmask of supported bits_per_word for transfers.
*/
struct altera_spi_platform_data {
u16 mode_bits;
u16 num_chipselect;
u32 bits_per_word_mask;
};
#endif /* __LINUX_SPI_ALTERA_H */