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SubjectRe: [PATCH v7 5/6] i2c: designware: add SLAVE mode functions
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On 03/20/17 13:10, Luis Oliveira wrote:
> - Changes in Kconfig to enable I2C_DESIGNWARE_SLAVE support
> - Slave functions added to core library file
> - Slave abort sources added to common source file
> - New driver: i2c-designware-slave added
> - Changes in the Makefile to compile the I2C_DESIGNWARE_SLAVE module
> when supported by the architecture.
>
> All the SLAVE flow is added but it is not enabled via platform
> driver.
>
> Signed-off-by: Luis Oliveira <lolivei@synopsys.com>
> ---
> v6-v7
> - changed error description in [ABRT_SLAVE_RD_INTX]. @Jarkko
> - moved "bool mode;" comment/description to this patch
>
> drivers/i2c/busses/Kconfig | 14 +-
> drivers/i2c/busses/Makefile | 1 +
> drivers/i2c/busses/i2c-designware-common.c | 6 +
> drivers/i2c/busses/i2c-designware-core.h | 4 +
> drivers/i2c/busses/i2c-designware-slave.c | 403 +++++++++++++++++++++++++++++
> 5 files changed, 427 insertions(+), 1 deletion(-)
> create mode 100644 drivers/i2c/busses/i2c-designware-slave.c
>
> diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
> index 8adc0f1d7ad0..f23575da67fd 100644
> --- a/drivers/i2c/busses/Kconfig
> +++ b/drivers/i2c/busses/Kconfig
> @@ -474,11 +474,23 @@ config I2C_DESIGNWARE_PLATFORM
> depends on (ACPI && COMMON_CLK) || !ACPI
> help
> If you say yes to this option, support will be included for the
> - Synopsys DesignWare I2C adapter. Only master mode is supported.
> + Synopsys DesignWare I2C adapter.
>
> This driver can also be built as a module. If so, the module
> will be called i2c-designware-platform.
>
> +config I2C_DESIGNWARE_SLAVE
> + bool "Synopsys DesignWare Slave"
> + select I2C_SLAVE
> + select I2C_SLAVE_EEPROM
> + depends on I2C_DESIGNWARE_PLATFORM
> + help
> + If you say yes to this option, support will be included for the
> + Synopsys DesignWare I2C slave adapter.
> +
> + This is not a standalone module, this module compiles together with
> + i2c-designware-core.
> +
> config I2C_DESIGNWARE_PCI
> tristate "Synopsys DesignWare PCI"
> depends on PCI
> diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
> index c89a4314c563..678cf6f4a552 100644
> --- a/drivers/i2c/busses/Makefile
> +++ b/drivers/i2c/busses/Makefile
> @@ -41,6 +41,7 @@ obj-$(CONFIG_I2C_CPM) += i2c-cpm.o
> obj-$(CONFIG_I2C_DAVINCI) += i2c-davinci.o
> obj-$(CONFIG_I2C_DESIGNWARE_CORE) += i2c-designware-core.o
> i2c-designware-core-objs := i2c-designware-common.o i2c-designware-master.o
> +i2c-designware-core-$(CONFIG_I2C_DESIGNWARE_SLAVE) += i2c-designware-slave.o
> obj-$(CONFIG_I2C_DESIGNWARE_PLATFORM) += i2c-designware-platform.o
> i2c-designware-platform-objs := i2c-designware-platdrv.o
> i2c-designware-platform-$(CONFIG_I2C_DESIGNWARE_BAYTRAIL) += i2c-designware-baytrail.o
> diff --git a/drivers/i2c/busses/i2c-designware-common.c b/drivers/i2c/busses/i2c-designware-common.c
> index 6357c7c78f6d..5cc089ad9e19 100644
> --- a/drivers/i2c/busses/i2c-designware-common.c
> +++ b/drivers/i2c/busses/i2c-designware-common.c
> @@ -56,6 +56,12 @@ static char *abort_sources[] = {
> "trying to use disabled adapter",
> [ARB_LOST] =
> "lost arbitration",
> + [ABRT_SLAVE_FLUSH_TXFIFO] =
> + "read command so flush old data in the TX FIFO",
> + [ABRT_SLAVE_ARBLOST] =
> + "slave lost the bus while transmitting data to a remote master",
> + [ABRT_SLAVE_RD_INTX] =
> + "incorrect slave-transmitter mode configuration",
> };
>
> u32 dw_readl(struct dw_i2c_dev *dev, int offset)
> diff --git a/drivers/i2c/busses/i2c-designware-core.h b/drivers/i2c/busses/i2c-designware-core.h
> index 33087e640f69..08072dbe0ff4 100644
> --- a/drivers/i2c/busses/i2c-designware-core.h
> +++ b/drivers/i2c/busses/i2c-designware-core.h
> @@ -225,6 +225,7 @@
> * @disable: function to disable the controller
> * @disable_int: function to disable all interrupts
> * @init: function to initialize the I2C hardware
> + * @mode: operation mode - I2C slave or I2C master
> *
> * HCNT and LCNT parameters can be used if the platform knows more accurate
> * values than the one computed based only on the input clock frequency.
> @@ -278,6 +279,7 @@ struct dw_i2c_dev {
> void (*disable)(struct dw_i2c_dev *dev);
> void (*disable_int)(struct dw_i2c_dev *dev);
> int (*init)(struct dw_i2c_dev *dev);
> + bool mode;
> };
>
"bool mode" is not self explaining. Let it either be int which then get
value DW_IC_MASTER or DW_IC_SLAVE or use "bool master" or "bool slave"
with boolean value. Should actually move to patch 6/6 as it's used there.

--
Jarkko

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