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Release 4.14 drivers/mfd/atmel-flexcom.c

Directory: drivers/mfd
/*
 * Driver for Atmel Flexcom
 *
 * Copyright (C) 2015 Atmel Corporation
 *
 * Author: Cyrille Pitchen <cyrille.pitchen@atmel.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <dt-bindings/mfd/atmel-flexcom.h>

/* I/O register offsets */

#define FLEX_MR		0x0	
/* Mode Register */

#define FLEX_VERSION	0xfc	
/* Version Register */

/* Mode Register bit fields */

#define FLEX_MR_OPMODE_OFFSET	(0)  
/* Operating Mode */

#define FLEX_MR_OPMODE_MASK	(0x3 << FLEX_MR_OPMODE_OFFSET)

#define FLEX_MR_OPMODE(opmode)	(((opmode) << FLEX_MR_OPMODE_OFFSET) &  \
                                 FLEX_MR_OPMODE_MASK)



static int atmel_flexcom_probe(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; struct clk *clk; struct resource *res; void __iomem *base; u32 opmode; int err; err = of_property_read_u32(np, "atmel,flexcom-mode", &opmode); if (err) return err; if (opmode < ATMEL_FLEXCOM_MODE_USART || opmode > ATMEL_FLEXCOM_MODE_TWI) return -EINVAL; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); base = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(base)) return PTR_ERR(base); clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(clk)) return PTR_ERR(clk); err = clk_prepare_enable(clk); if (err) return err; /* * Set the Operating Mode in the Mode Register: only the selected device * is clocked. Hence, registers of the other serial devices remain * inaccessible and are read as zero. Also the external I/O lines of the * Flexcom are muxed to reach the selected device. */ writel(FLEX_MR_OPMODE(opmode), base + FLEX_MR); clk_disable_unprepare(clk); return devm_of_platform_populate(&pdev->dev); }

Contributors

PersonTokensPropCommitsCommitProp
Cyrille Pitchen17799.44%150.00%
Benjamin Gaignard10.56%150.00%
Total178100.00%2100.00%

static const struct of_device_id atmel_flexcom_of_match[] = { { .compatible = "atmel,sama5d2-flexcom" }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, atmel_flexcom_of_match); static struct platform_driver atmel_flexcom_driver = { .probe = atmel_flexcom_probe, .driver = { .name = "atmel_flexcom", .of_match_table = atmel_flexcom_of_match, }, }; module_platform_driver(atmel_flexcom_driver); MODULE_AUTHOR("Cyrille Pitchen <cyrille.pitchen@atmel.com>"); MODULE_DESCRIPTION("Atmel Flexcom MFD driver"); MODULE_LICENSE("GPL v2");

Overall Contributors

PersonTokensPropCommitsCommitProp
Cyrille Pitchen31099.68%150.00%
Benjamin Gaignard10.32%150.00%
Total311100.00%2100.00%
Directory: drivers/mfd
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