2b1c6b21b5
As usual these patches were extracted and rebased from the raspberry pi repo: https://github.com/raspberrypi/linux/tree/rpi-4.4.y Also adds support for Raspberry Pi Compute Module 3 (untested). Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
99 lines
2.8 KiB
Diff
99 lines
2.8 KiB
Diff
From 4efc768113042d0b48fdb4e170d5469f93f6e20b Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Tue, 19 Jan 2016 16:28:05 +0000
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Subject: [PATCH] FIXUP i2c_bcm2708: Don't change module baudrate parameter
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Overwriting the baudrate module parameter creates an apparent
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forced baudrate for i2c busses after the first. Not only does this
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override the baudrate from DT it also prevents the bus ID from
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being initialised.
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Also fix whitespace errors.
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---
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drivers/i2c/busses/i2c-bcm2708.c | 48 +++++++++++++++++++++-------------------
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1 file changed, 25 insertions(+), 23 deletions(-)
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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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@@ -71,7 +71,6 @@
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#define DRV_NAME "bcm2708_i2c"
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-static unsigned int baudrate_default = CONFIG_I2C_BCM2708_BAUDRATE;
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static unsigned int 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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@@ -317,25 +316,28 @@ static int bcm2708_i2c_probe(struct plat
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struct i2c_adapter *adap;
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unsigned long bus_hz;
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u32 cdiv, clk_tout;
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-
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- if (!baudrate) {
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- baudrate = baudrate_default;
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- if (pdev->dev.of_node) {
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- u32 bus_clk_rate;
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- pdev->id = of_alias_get_id(pdev->dev.of_node, "i2c");
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- if (pdev->id < 0) {
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- dev_err(&pdev->dev, "alias is missing\n");
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- return -EINVAL;
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- }
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- if (!of_property_read_u32(pdev->dev.of_node,
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- "clock-frequency", &bus_clk_rate))
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- baudrate = bus_clk_rate;
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- else
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- dev_warn(&pdev->dev,
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- "Could not read clock-frequency property\n");
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+ u32 baud;
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+
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+ baud = CONFIG_I2C_BCM2708_BAUDRATE;
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+
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+ if (pdev->dev.of_node) {
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+ u32 bus_clk_rate;
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+ pdev->id = of_alias_get_id(pdev->dev.of_node, "i2c");
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+ if (pdev->id < 0) {
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+ dev_err(&pdev->dev, "alias is missing\n");
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+ return -EINVAL;
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}
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+ if (!of_property_read_u32(pdev->dev.of_node,
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+ "clock-frequency", &bus_clk_rate))
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+ baud = bus_clk_rate;
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+ else
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+ dev_warn(&pdev->dev,
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+ "Could not read clock-frequency property\n");
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}
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+ if (baudrate)
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+ baud = baudrate;
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+
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regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!regs) {
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dev_err(&pdev->dev, "could not get IO memory\n");
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@@ -419,21 +421,21 @@ static int bcm2708_i2c_probe(struct plat
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}
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bus_hz = clk_get_rate(bi->clk);
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- cdiv = bus_hz / baudrate;
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+ cdiv = bus_hz / baud;
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if (cdiv > 0xffff) {
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cdiv = 0xffff;
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- baudrate = bus_hz / cdiv;
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+ baud = bus_hz / cdiv;
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}
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-
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- clk_tout = 35/1000*baudrate; //35ms timeout as per SMBus specs.
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- if (clk_tout > 0xffff)
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+
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+ clk_tout = 35/1000*baud; //35ms timeout as per SMBus specs.
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+ if (clk_tout > 0xffff)
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clk_tout = 0xffff;
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bi->cdiv = cdiv;
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bi->clk_tout = clk_tout;
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dev_info(&pdev->dev, "BSC%d Controller at 0x%08lx (irq %d) (baudrate %d)\n",
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- pdev->id, (unsigned long)regs->start, irq, baudrate);
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+ pdev->id, (unsigned long)regs->start, irq, baud);
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return 0;
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