c564e6ae6c
The platform data for the i2c-s3c2410 driver used to allow a min, max and desired frequency for the I2C bus. This patch reduces it to simply a desired frequency ceiling and corrects all the uses of the platform data appropriately. This means, for example, that on a system with a 66MHz fclk, a request for 100KHz will achieve 65KHz which is safe and acceptable, rather than 378KHz which it would have achieved without this change. Signed-off-by: Simtec Linux Team <linux@simtec.co.uk> Signed-off-by: Daniel Silverstone <dsilvers@simtec.co.uk> [ben-linux@fluff.org: tidy subject and description] Signed-off-by: Ben Dooks <ben-linux@fluff.org>
69 lines
1.5 KiB
C
69 lines
1.5 KiB
C
/* linux/arch/arm/plat-s3c/dev-i2c1.c
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*
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* Copyright 2008,2009 Simtec Electronics
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* Ben Dooks <ben@simtec.co.uk>
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* http://armlinux.simtec.co.uk/
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*
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* S3C series device definition for i2c device 1
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/platform_device.h>
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#include <mach/irqs.h>
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#include <mach/map.h>
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#include <plat/regs-iic.h>
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#include <plat/iic.h>
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#include <plat/devs.h>
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#include <plat/cpu.h>
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static struct resource s3c_i2c_resource[] = {
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[0] = {
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.start = S3C_PA_IIC1,
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.end = S3C_PA_IIC1 + SZ_4K - 1,
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.flags = IORESOURCE_MEM,
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},
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[1] = {
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.start = IRQ_IIC1,
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.end = IRQ_IIC1,
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.flags = IORESOURCE_IRQ,
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},
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};
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struct platform_device s3c_device_i2c1 = {
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.name = "s3c2410-i2c",
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.id = 1,
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.num_resources = ARRAY_SIZE(s3c_i2c_resource),
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.resource = s3c_i2c_resource,
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};
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static struct s3c2410_platform_i2c default_i2c_data1 __initdata = {
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.flags = 0,
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.bus_num = 1,
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.slave_addr = 0x10,
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.frequency = 100*1000,
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.sda_delay = 100,
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};
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void __init s3c_i2c1_set_platdata(struct s3c2410_platform_i2c *pd)
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{
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struct s3c2410_platform_i2c *npd;
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if (!pd)
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pd = &default_i2c_data1;
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npd = kmemdup(pd, sizeof(struct s3c2410_platform_i2c), GFP_KERNEL);
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if (!npd)
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printk(KERN_ERR "%s: no memory for platform data\n", __func__);
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else if (!npd->cfg_gpio)
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npd->cfg_gpio = s3c_i2c1_cfg_gpio;
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s3c_device_i2c1.dev.platform_data = npd;
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}
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