@@ -133,6 +133,13 @@ int i2c_dw_init_regmap(struct dw_i2c_dev *dev)
u32 reg;
int ret;
+ /*
+ * Skip detecting the registers map configuration if the regmap has
+ * already been provided by a higher code.
+ */
+ if (dev->map)
+ return 0;
+
ret = i2c_dw_acquire_lock(dev);
if (ret)
return ret;
@@ -212,10 +212,16 @@ int i2c_dw_plat_setup(struct dw_i2c_dev *dev)
if (dev->irq < 0)
return dev->irq;
- mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- dev->base = devm_ioremap_resource(&pdev->dev, mem);
- if (IS_ERR(dev->base))
- return PTR_ERR(dev->base);
+ /*
+ * Don't try to get the controller registers MMIO space if regmap has
+ * been provided by a higher level code.
+ */
+ if (!dev->map) {
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ dev->base = devm_ioremap_resource(&pdev->dev, mem);
+ if (IS_ERR(dev->base))
+ return PTR_ERR(dev->base);
+ }
dev->rst = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL);
if (IS_ERR(dev->rst))
This is a preparation patch before adding a glue platform driver for the Baikal-T1 I2C controller. Since the i2c controller registers are indirectly accessed by means of the Baikal-T1 System Controller registers we need to have a way to disable the default registers mapping setup procedure and make the DW I2C core/platform code to use a provided by a glue driver regmap. Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru> Cc: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Paul Burton <paulburton@kernel.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Rob Herring <robh+dt@kernel.org> Cc: Frank Rowand <frowand.list@gmail.com> Cc: linux-mips@vger.kernel.org Cc: devicetree@vger.kernel.org --- drivers/i2c/busses/i2c-designware-common.c | 7 +++++++ drivers/i2c/busses/i2c-designware-platdrv.c | 14 ++++++++++---- 2 files changed, 17 insertions(+), 4 deletions(-)