From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751811AbcL1OtK (ORCPT ); Wed, 28 Dec 2016 09:49:10 -0500 Received: from us01smtprelay-2.synopsys.com ([198.182.47.9]:49210 "EHLO smtprelay.synopsys.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751133AbcL1Orh (ORCPT ); Wed, 28 Dec 2016 09:47:37 -0500 From: Luis Oliveira To: wsa@the-dreams.de, robh+dt@kernel.org, mark.rutland@arm.com, jarkko.nikula@linux.intel.com, andriy.shevchenko@linux.intel.com, mika.westerberg@linux.intel.com, linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Luis.Oliveira@synopsys.com, Ramiro.Oliveira@synopsys.com, Joao.Pinto@synopsys.com, CARLOS.PALMINHA@synopsys.com Subject: [PATCH v5 6/7] i2c: designware: enable SLAVE in platform module Date: Wed, 28 Dec 2016 14:43:25 +0000 Message-Id: X-Mailer: git-send-email 2.11.0 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org - Slave mode selected in platform module (devicetree support only) - Check for ACPI - not supported in SLAVE mode: - Changed the ifndef style to the use of ACPI_HANDLE that returns NULL if the device was not enumerated from ACPI namespace. Signed-off-by: Luis Oliveira --- Changes V4->V5: (Andy Shevchenko, Rob Herring, Mark Rutland) - This is the patch that actually enable SLAVE mode in the platform module by probing the DT nodes (Rob suggestion). - Changed my device tree. Now I'm using: to identify a Slave. - I have a new way of checking if ACPI is not enabled using the ACPI_HANDLE and not ifdef. drivers/i2c/busses/i2c-designware-platdrv.c | 70 +++++++++++++++++++++++++---- 1 file changed, 62 insertions(+), 8 deletions(-) diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c index 5cf4df63dbe8..ef75031f8a62 100644 --- a/drivers/i2c/busses/i2c-designware-platdrv.c +++ b/drivers/i2c/busses/i2c-designware-platdrv.c @@ -21,6 +21,7 @@ * ---------------------------------------------------------------------------- * */ +#include #include #include #include @@ -143,11 +144,15 @@ static void i2c_dw_configure_master(struct platform_device *pdev) { struct dw_i2c_dev *dev = platform_get_drvdata(pdev); + dev->functionality = I2C_FUNC_10BIT_ADDR | DW_IC_DEFAULT_FUNCTIONALITY; + dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE | DW_IC_CON_RESTART_EN; dev_dbg(&pdev->dev, "I am registed as a I2C Master!\n"); + dev->mode = DW_IC_MASTER; + switch (dev->clk_freq) { case 100000: dev->master_cfg |= DW_IC_CON_SPEED_STD; @@ -160,6 +165,32 @@ static void i2c_dw_configure_master(struct platform_device *pdev) } } +static void i2c_dw_configure_slave(struct platform_device *pdev) +{ + struct dw_i2c_dev *dev = platform_get_drvdata(pdev); + + dev->functionality = I2C_FUNC_SLAVE | DW_IC_DEFAULT_FUNCTIONALITY; + + dev->slave_cfg = DW_IC_CON_RX_FIFO_FULL_HLD_CTRL | + DW_IC_CON_RESTART_EN | DW_IC_CON_STOP_DET_IFADDRESSED | + DW_IC_CON_SPEED_FAST; + + dev_dbg(&pdev->dev, "I am registed as a I2C Slave!\n"); + + dev->mode = DW_IC_SLAVE; + + switch (dev->clk_freq) { + case 100000: + dev->slave_cfg |= DW_IC_CON_SPEED_STD; + break; + case 3400000: + dev->slave_cfg |= DW_IC_CON_SPEED_HIGH; + break; + default: + dev->slave_cfg |= DW_IC_CON_SPEED_FAST; + } +} + static int i2c_dw_plat_prepare_clk(struct dw_i2c_dev *i_dev, bool prepare) { if (IS_ERR(i_dev->clk)) @@ -200,9 +231,11 @@ static int dw_i2c_plat_probe(struct platform_device *pdev) struct dw_i2c_platform_data *pdata = dev_get_platdata(&pdev->dev); struct i2c_adapter *adap; struct dw_i2c_dev *dev; + struct fwnode_handle *child; u32 acpi_speed, ht = 0; struct resource *mem; int irq, r; + u32 reg; irq = platform_get_irq(pdev, 0); if (irq < 0) @@ -264,9 +297,16 @@ static int dw_i2c_plat_probe(struct platform_device *pdev) if (r) return r; - dev->functionality = I2C_FUNC_10BIT_ADDR | DW_IC_DEFAULT_FUNCTIONALITY; - - i2c_dw_configure_master(pdev); + if (ACPI_HANDLE(&pdev->dev) == NULL) { + device_for_each_child_node(&pdev->dev, child) { + fwnode_property_read_u32(child, "reg", ®); + if (reg & I2C_OWN_SLAVE_ADDRESS) + i2c_dw_configure_slave(pdev); + else + i2c_dw_configure_master(pdev); + } + } else + i2c_dw_configure_master(pdev); dev->clk = devm_clk_get(&pdev->dev, NULL); if (!i2c_dw_plat_prepare_clk(dev, true)) { @@ -295,7 +335,11 @@ static int dw_i2c_plat_probe(struct platform_device *pdev) pm_runtime_enable(&pdev->dev); } - r = i2c_dw_probe(dev); + if (dev->mode == DW_IC_SLAVE) + r = i2c_dw_probe_slave(dev); + else + r = i2c_dw_probe(dev); + if (r && !dev->pm_runtime_disabled) pm_runtime_disable(&pdev->dev); @@ -310,7 +354,10 @@ static int dw_i2c_plat_remove(struct platform_device *pdev) i2c_del_adapter(&dev->adapter); - i2c_dw_disable(dev); + if (dev->mode == DW_IC_SLAVE) + i2c_dw_disable_slave(dev); + else + i2c_dw_disable(dev); pm_runtime_dont_use_autosuspend(&pdev->dev); pm_runtime_put_sync(&pdev->dev); @@ -350,7 +397,10 @@ static int dw_i2c_plat_suspend(struct device *dev) struct platform_device *pdev = to_platform_device(dev); struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev); - i2c_dw_disable(i_dev); + if (i_dev->mode == DW_IC_SLAVE) + i2c_dw_disable_slave(i_dev); + else + i2c_dw_disable(i_dev); i2c_dw_plat_prepare_clk(i_dev, false); return 0; @@ -363,8 +413,12 @@ static int dw_i2c_plat_resume(struct device *dev) i2c_dw_plat_prepare_clk(i_dev, true); - if (!i_dev->pm_runtime_disabled) - i2c_dw_init(i_dev); + if (!i_dev->pm_runtime_disabled) { + if (i_dev->mode == DW_IC_SLAVE) + i2c_dw_init_slave(i_dev); + else + i2c_dw_init(i_dev); + } return 0; } -- 2.11.0