You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
100 lines
2.8 KiB
Diff
100 lines
2.8 KiB
Diff
From 8fc1dbc4b294803d2a6794b1ede681641da45711 Mon Sep 17 00:00:00 2001
|
|
From: Phil Elwell <phil@raspberrypi.org>
|
|
Date: Tue, 19 Jan 2016 16:28:05 +0000
|
|
Subject: [PATCH 139/304] FIXUP i2c_bcm2708: Don't change module baudrate
|
|
parameter
|
|
|
|
Overwriting the baudrate module parameter creates an apparent
|
|
forced baudrate for i2c busses after the first. Not only does this
|
|
override the baudrate from DT it also prevents the bus ID from
|
|
being initialised.
|
|
|
|
Also fix whitespace errors.
|
|
---
|
|
drivers/i2c/busses/i2c-bcm2708.c | 48 +++++++++++++++++++++-------------------
|
|
1 file changed, 25 insertions(+), 23 deletions(-)
|
|
|
|
--- a/drivers/i2c/busses/i2c-bcm2708.c
|
|
+++ b/drivers/i2c/busses/i2c-bcm2708.c
|
|
@@ -71,7 +71,6 @@
|
|
|
|
#define DRV_NAME "bcm2708_i2c"
|
|
|
|
-static unsigned int baudrate_default = CONFIG_I2C_BCM2708_BAUDRATE;
|
|
static unsigned int baudrate;
|
|
module_param(baudrate, uint, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
|
|
MODULE_PARM_DESC(baudrate, "The I2C baudrate");
|
|
@@ -317,25 +316,28 @@ static int bcm2708_i2c_probe(struct plat
|
|
struct i2c_adapter *adap;
|
|
unsigned long bus_hz;
|
|
u32 cdiv, clk_tout;
|
|
-
|
|
- if (!baudrate) {
|
|
- baudrate = baudrate_default;
|
|
- if (pdev->dev.of_node) {
|
|
- u32 bus_clk_rate;
|
|
- pdev->id = of_alias_get_id(pdev->dev.of_node, "i2c");
|
|
- if (pdev->id < 0) {
|
|
- dev_err(&pdev->dev, "alias is missing\n");
|
|
- return -EINVAL;
|
|
- }
|
|
- if (!of_property_read_u32(pdev->dev.of_node,
|
|
- "clock-frequency", &bus_clk_rate))
|
|
- baudrate = bus_clk_rate;
|
|
- else
|
|
- dev_warn(&pdev->dev,
|
|
- "Could not read clock-frequency property\n");
|
|
+ u32 baud;
|
|
+
|
|
+ baud = CONFIG_I2C_BCM2708_BAUDRATE;
|
|
+
|
|
+ if (pdev->dev.of_node) {
|
|
+ u32 bus_clk_rate;
|
|
+ pdev->id = of_alias_get_id(pdev->dev.of_node, "i2c");
|
|
+ if (pdev->id < 0) {
|
|
+ dev_err(&pdev->dev, "alias is missing\n");
|
|
+ return -EINVAL;
|
|
}
|
|
+ if (!of_property_read_u32(pdev->dev.of_node,
|
|
+ "clock-frequency", &bus_clk_rate))
|
|
+ baud = bus_clk_rate;
|
|
+ else
|
|
+ dev_warn(&pdev->dev,
|
|
+ "Could not read clock-frequency property\n");
|
|
}
|
|
|
|
+ if (baudrate)
|
|
+ baud = baudrate;
|
|
+
|
|
regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!regs) {
|
|
dev_err(&pdev->dev, "could not get IO memory\n");
|
|
@@ -419,21 +421,21 @@ static int bcm2708_i2c_probe(struct plat
|
|
}
|
|
|
|
bus_hz = clk_get_rate(bi->clk);
|
|
- cdiv = bus_hz / baudrate;
|
|
+ cdiv = bus_hz / baud;
|
|
if (cdiv > 0xffff) {
|
|
cdiv = 0xffff;
|
|
- baudrate = bus_hz / cdiv;
|
|
+ baud = bus_hz / cdiv;
|
|
}
|
|
-
|
|
- clk_tout = 35/1000*baudrate; //35ms timeout as per SMBus specs.
|
|
- if (clk_tout > 0xffff)
|
|
+
|
|
+ clk_tout = 35/1000*baud; //35ms timeout as per SMBus specs.
|
|
+ if (clk_tout > 0xffff)
|
|
clk_tout = 0xffff;
|
|
|
|
bi->cdiv = cdiv;
|
|
bi->clk_tout = clk_tout;
|
|
|
|
dev_info(&pdev->dev, "BSC%d Controller at 0x%08lx (irq %d) (baudrate %d)\n",
|
|
- pdev->id, (unsigned long)regs->start, irq, baudrate);
|
|
+ pdev->id, (unsigned long)regs->start, irq, baud);
|
|
|
|
return 0;
|
|
|