linux-kernel - [RESEND PATCH v6 6/6] i2c: designware: enable SLAVE in platform module

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Date:   Wed,  1 Mar 2017 15:59:46 +0000
From:   Luis Oliveira <Luis.Oliveira@...opsys.com>
To:     wsa@...-dreams.de, robh+dt@...nel.org, mark.rutland@....com,
        jarkko.nikula@...ux.intel.com, andriy.shevchenko@...ux.intel.com,
        mika.westerberg@...ux.intel.com, linux-i2c@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Luis.Oliveira@...opsys.com, Ramiro.Oliveira@...opsys.com,
        Joao.Pinto@...opsys.com, CARLOS.PALMINHA@...opsys.com
Subject: [RESEND PATCH v6 6/6] i2c: designware: enable SLAVE in platform module

- Slave mode selected in platform module if the support is detected in
  the DT.

Signed-off-by: Luis Oliveira <lolivei@...opsys.com>
---
V5->V6
- No changes

 drivers/i2c/busses/Kconfig                  |  1 +
 drivers/i2c/busses/i2c-designware-platdrv.c | 41 +++++++++++++++++++++++++----
 2 files changed, 37 insertions(+), 5 deletions(-)

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index b3d37ac9f5f6..13bd932c81f7 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -484,6 +484,7 @@ config I2C_DESIGNWARE_SLAVE
 	select I2C_SLAVE
 	select I2C_SLAVE_EEPROM
 	depends on I2C_DESIGNWARE_PLATFORM
+	default y
 	help
 	  If you say yes to this option, support will be included for the
 	  Synopsys DesignWare I2C slave adapter.
diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
index 671bdc0fdb24..5fcd9dbfc64c 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -1,5 +1,5 @@
 /*
- * Synopsys DesignWare I2C adapter driver (master only).
+ * Synopsys DesignWare I2C adapter driver.
  *
  * Based on the TI DAVINCI I2C adapter driver.
  *
@@ -142,9 +142,13 @@ static inline int dw_i2c_acpi_configure(struct platform_device *pdev)
 
 static void i2c_dw_configure_master(struct dw_i2c_dev *dev)
 {
+	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->mode = DW_IC_MASTER;
+
 	switch (dev->clk_freq) {
 	case 100000:
 		dev->master_cfg |= DW_IC_CON_SPEED_STD;
@@ -157,6 +161,28 @@ static void i2c_dw_configure_master(struct dw_i2c_dev *dev)
 	}
 }
 
+static void i2c_dw_configure_slave(struct dw_i2c_dev *dev)
+{
+	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->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))
@@ -261,9 +287,10 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	dev->functionality = I2C_FUNC_10BIT_ADDR | DW_IC_DEFAULT_FUNCTIONALITY;
-
-	i2c_dw_configure_master(dev);
+	if (i2c_detect_slave_mode(&pdev->dev))
+		i2c_dw_configure_slave(dev);
+	else
+		i2c_dw_configure_master(dev);
 
 	dev->clk = devm_clk_get(&pdev->dev, NULL);
 	if (!i2c_dw_plat_prepare_clk(dev, true)) {
@@ -292,7 +319,11 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
 		pm_runtime_enable(&pdev->dev);
 	}
 
-	ret = i2c_dw_probe(dev);
+	if (dev->mode == DW_IC_SLAVE)
+		ret = i2c_dw_probe_slave(dev);
+	else
+		ret = i2c_dw_probe(dev);
+
 	if (ret && !dev->pm_runtime_disabled)
 		pm_runtime_disable(&pdev->dev);
 
-- 
2.11.0