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i2c: designware: Rework probe() to get clock a bit later 

In order to be able to create missing clock for AMD (and in future possibly
others) we move getting clock for the device a bit later. Also make ACPI/DT
configuration in the same place depending on from where the device was
enumerated from.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Mika Westerberg 2014-09-30 13:04:54 +03:00 committed by Wolfram Sang
parent 0b26c845df
commit 925ddb240d
1 changed files with 18 additions and 20 deletions
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38
drivers/i2c/busses/i2c-designware-platdrv.c
View File

@ -81,9 +81,6 @@ static int dw_i2c_acpi_configure(struct platform_device *pdev)
{
struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
if (!ACPI_HANDLE(&pdev->dev))
return -ENODEV;
dev->adapter.nr = -1;
dev->tx_fifo_depth = 32;
dev->rx_fifo_depth = 32;
@ -123,7 +120,7 @@ static int dw_i2c_probe(struct platform_device *pdev)
struct resource *mem;
struct dw_i2c_platform_data *pdata;
int irq, r;
u32 clk_freq;
u32 clk_freq, ht = 0;
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
@ -146,24 +143,14 @@ static int dw_i2c_probe(struct platform_device *pdev)
dev->irq = irq;
platform_set_drvdata(pdev, dev);
dev->clk = devm_clk_get(&pdev->dev, NULL);
dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
if (IS_ERR(dev->clk))
return PTR_ERR(dev->clk);
clk_prepare_enable(dev->clk);
/* fast mode by default because of legacy reasons */
clk_freq = 400000;
if (pdev->dev.of_node) {
u32 ht = 0;
u32 ic_clk = dev->get_clk_rate_khz(dev);
if (ACPI_COMPANION(&pdev->dev)) {
dw_i2c_acpi_configure(pdev);
} else if (pdev->dev.of_node) {
of_property_read_u32(pdev->dev.of_node,
"i2c-sda-hold-time-ns", &ht);
dev->sda_hold_time = div_u64((u64)ic_clk * ht + 500000,
1000000);
of_property_read_u32(pdev->dev.of_node,
"i2c-sda-falling-time-ns",
@ -202,9 +189,20 @@ static int dw_i2c_probe(struct platform_device *pdev)
dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE |
DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_FAST;
/* Try first if we can configure the device from ACPI */
r = dw_i2c_acpi_configure(pdev);
if (r) {
dev->clk = devm_clk_get(&pdev->dev, NULL);
dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
if (IS_ERR(dev->clk))
return PTR_ERR(dev->clk);
clk_prepare_enable(dev->clk);
if (!dev->sda_hold_time && ht) {
u32 ic_clk = dev->get_clk_rate_khz(dev);
dev->sda_hold_time = div_u64((u64)ic_clk * ht + 500000,
1000000);
}
if (!dev->tx_fifo_depth) {
u32 param1 = i2c_dw_read_comp_param(dev);
dev->tx_fifo_depth = ((param1 >> 16) & 0xff) + 1;