78 lines
2.4 KiB
Diff
78 lines
2.4 KiB
Diff
From ec78c7da4fe9f7289cdc3e948b70a43c900f2be4 Mon Sep 17 00:00:00 2001
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From: popcornmix <popcornmix@gmail.com>
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Date: Wed, 3 Oct 2012 20:08:19 +0100
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Subject: [PATCH 036/196] set i2c speed via module-parameter or menuconfig.
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Thanks FrankBoesing
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---
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drivers/i2c/busses/Kconfig | 11 +++++++++++
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drivers/i2c/busses/i2c-bcm2708.c | 12 ++++++++----
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2 files changed, 19 insertions(+), 4 deletions(-)
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diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
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index 290aee4..abaff1a 100644
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--- a/drivers/i2c/busses/Kconfig
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+++ b/drivers/i2c/busses/Kconfig
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@@ -355,6 +355,17 @@ config I2C_BCM2708
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support for the BCM2708. BSC is a Broadcom proprietary bus compatible
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with I2C/TWI/SMBus.
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+config I2C_BCM2708_BAUDRATE
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+ prompt "BCM2708 I2C baudrate"
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+ depends on I2C_BCM2708
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+ int
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+ default 100000
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+ help
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+ Set the I2C baudrate. This will alter the default value. A
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+ different baudrate can be set by using a module parameter as well. If
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+ no parameter is provided when loading, this is the value that will be
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+ used.
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+
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config I2C_BLACKFIN_TWI
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tristate "Blackfin TWI I2C support"
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depends on BLACKFIN
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diff --git a/drivers/i2c/busses/i2c-bcm2708.c b/drivers/i2c/busses/i2c-bcm2708.c
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index 7cae615..3391889 100644
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--- a/drivers/i2c/busses/i2c-bcm2708.c
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+++ b/drivers/i2c/busses/i2c-bcm2708.c
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@@ -66,11 +66,15 @@
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#define BSC_S_DONE 0x00000002
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#define BSC_S_TA 0x00000001
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-#define I2C_CLOCK_HZ 100000 /* FIXME: get from DT */
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#define I2C_TIMEOUT_MS 150
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#define DRV_NAME "bcm2708_i2c"
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+static unsigned int baudrate = CONFIG_I2C_BCM2708_BAUDRATE;
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+module_param(baudrate, uint, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
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+MODULE_PARM_DESC(baudrate, "The I2C baudrate");
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+
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+
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struct bcm2708_i2c {
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struct i2c_adapter adapter;
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@@ -148,7 +152,7 @@ static inline void bcm2708_bsc_setup(struct bcm2708_i2c *bi)
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u32 c = BSC_C_I2CEN | BSC_C_INTD | BSC_C_ST | BSC_C_CLEAR_1;
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bus_hz = clk_get_rate(bi->clk);
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- cdiv = bus_hz / I2C_CLOCK_HZ;
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+ cdiv = bus_hz / baudrate;
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if (bi->msg->flags & I2C_M_RD)
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c |= BSC_C_INTR | BSC_C_READ;
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@@ -331,8 +335,8 @@ static int bcm2708_i2c_probe(struct platform_device *pdev)
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goto out_free_irq;
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}
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- dev_info(&pdev->dev, "BSC%d Controller at 0x%08lx (irq %d)\n",
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- pdev->id, (unsigned long)regs->start, irq);
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+ dev_info(&pdev->dev, "BSC%d Controller at 0x%08lx (irq %d) (baudrate %dk)\n",
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+ pdev->id, (unsigned long)regs->start, irq, baudrate/1000);
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return 0;
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--
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1.9.1
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