From: Luis Oliveira <Luis.Oliveira@synopsys.com>
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 [thread overview]
Message-ID: <ea8b611c3b7c2af8088e2dbc16554af5c8aed368.1482934380.git.lolivei@synopsys.com> (raw)
In-Reply-To: <cover.1482934380.git.lolivei@synopsys.com>
In-Reply-To: <cover.1482934380.git.lolivei@synopsys.com>
- 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 <lolivei@synopsys.com>
---
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: <reg | I2C_OWN_SLAVE_ADDRESS>
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 <dt-bindings/i2c/i2c.h>
#include <linux/acpi.h>
#include <linux/clk-provider.h>
#include <linux/clk.h>
@@ -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
next prev parent reply other threads:[~2016-12-28 14:49 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-28 14:43 [PATCH v5 0/7] i2c: designware: add I2C SLAVE support Luis Oliveira
2016-12-28 14:43 ` [PATCH v5 1/7] i2c: designware: Cleaning and comment style fixes Luis Oliveira
2016-12-28 14:43 ` [PATCH v5 2/7] i2c: designware: refactoring of the i2c-designware Luis Oliveira
2016-12-28 15:12 ` Andy Shevchenko
2016-12-28 15:30 ` Luis Oliveira
2016-12-28 14:43 ` [PATCH v5 3/7] i2c: designware: MASTER mode as separated driver Luis Oliveira
2016-12-28 14:43 ` [PATCH v5 4/7] i2c: designware: introducing I2C_SLAVE definitions Luis Oliveira
2016-12-28 15:17 ` Andy Shevchenko
2016-12-28 14:43 ` [PATCH v5 5/7] i2c: designware: add SLAVE mode functions Luis Oliveira
2016-12-28 15:36 ` Andy Shevchenko
2016-12-28 16:00 ` Luis Oliveira
2016-12-31 23:45 ` kbuild test robot
2016-12-28 14:43 ` Luis Oliveira [this message]
2016-12-28 15:44 ` [PATCH v5 6/7] i2c: designware: enable SLAVE in platform module Andy Shevchenko
2016-12-28 15:53 ` Luis Oliveira
2016-12-28 16:31 ` Andy Shevchenko
2016-12-28 16:41 ` Luis Oliveira
2016-12-28 16:49 ` Carlos Palminha
2016-12-28 17:10 ` Andy Shevchenko
2016-12-28 18:10 ` Luis Oliveira
2017-01-05 12:13 ` Luis Oliveira
2017-01-05 12:43 ` Andy Shevchenko
2016-12-28 14:43 ` [PATCH v5 7/7] i2c: designware: style changes in existing code Luis Oliveira
2016-12-28 15:50 ` Andy Shevchenko
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