spi: altera: add SPI core parameters support via platform data. (8e04187c) · Commits · 戴 / test

drivers/spi/spi-altera.c

+22 −3

Original line number	Diff line number	Diff line
		@@ -14,6 +14,7 @@
		#include <linux/errno.h>
		#include <linux/module.h>
		#include <linux/platform_device.h>
		#include <linux/spi/altera.h>
		#include <linux/spi/spi.h>
		#include <linux/io.h>
		#include <linux/of.h>
		@@ -40,6 +41,8 @@
		#define ALTERA_SPI_CONTROL_IE_MSK 0x100
		#define ALTERA_SPI_CONTROL_SSO_MSK 0x400

		#define ALTERA_SPI_MAX_CS 32

		struct altera_spi {
		void __iomem *base;
		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)
		{
		struct altera_spi_platform_data *pdata = dev_get_platdata(&pdev->dev);
		struct altera_spi *hw;
		struct spi_master *master;
		int err = -ENODEV;
		@@ -192,9 +196,24 @@ static int altera_spi_probe(struct platform_device *pdev)

		/* setup the master state. */
		master->bus_num = pdev->id;

		if (pdata) {
		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->transfer_one = altera_spi_txrx;
		master->set_cs = altera_spi_set_cs;

0 → 100644

+24 −0

Original line number	Diff line number	Diff line
		/* 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 */