From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mika Westerberg Subject: [PATCH v2 2/3] i2c: designware: Rework probe() to get clock a bit later Date: Tue, 30 Sep 2014 13:04:54 +0300 Message-ID: <1412071495-15323-3-git-send-email-mika.westerberg@linux.intel.com> References: <1412071495-15323-1-git-send-email-mika.westerberg@linux.intel.com> Return-path: In-Reply-To: <1412071495-15323-1-git-send-email-mika.westerberg-VuQAYsv1563Yd54FQh9/CA@public.gmane.org> Sender: linux-i2c-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Wolfram Sang Cc: Carl Peng , Huang Rui , Christian Ruppert , Romain Baeriswyl , linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Mika Westerberg List-Id: linux-i2c@vger.kernel.org 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 --- drivers/i2c/busses/i2c-designware-platdrv.c | 38 ++++++++++++++--------------- 1 file 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; -- 2.1.0