diff options
| author | Mika Westerberg <mika.westerberg@linux.intel.com> | 2014-09-30 12:04:54 +0200 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2014-10-06 19:49:51 +0200 |
| commit | 925ddb240d6c76e56dd3aa22493f5755c452ba61 (patch) | |
| tree | 333b0683d4753a81a9441b927109b39199606dc4 /drivers/i2c/busses/i2c-designware-platdrv.c | |
| parent | i2c: designware: Default to fast mode in case of ACPI (diff) | |
| download | linux-925ddb240d6c76e56dd3aa22493f5755c452ba61.tar.xz linux-925ddb240d6c76e56dd3aa22493f5755c452ba61.zip | |
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>
Diffstat (limited to 'drivers/i2c/busses/i2c-designware-platdrv.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-designware-platdrv.c | 38 |
1 files changed, 18 insertions, 20 deletions
diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c index 353adc4dc583..e59c63ae4d41 100644 --- a/drivers/i2c/busses/i2c-designware-platdrv.c +++ b/drivers/i2c/busses/i2c-designware-platdrv.c @@ -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; |