On Wed, Jun 14, 2017 at 1:43 PM, Luis Oliveira
<Luis.Oliveira@xxxxxxxxxxxx> wrote:
> - Slave mode selected in platform module if the support is detected in
> the DT.
>
> Signed-off-by: Luis Oliveira <lolivei@xxxxxxxxxxxx>
This one looks fine to me.
Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
> ---
> v10-v11
> - no changes
>
> drivers/i2c/busses/i2c-designware-core.h | 2 ++
> drivers/i2c/busses/i2c-designware-platdrv.c | 41 +++++++++++++++++++++++++----
> 2 files changed, 38 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/i2c/busses/i2c-designware-core.h b/drivers/i2c/busses/i2c-designware-core.h
> index 64a39a983410..7bfbcc62f6c5 100644
> --- a/drivers/i2c/busses/i2c-designware-core.h
> +++ b/drivers/i2c/busses/i2c-designware-core.h
> @@ -228,6 +228,7 @@
> * @disable: function to disable the controller
> * @disable_int: function to disable all interrupts
> * @init: function to initialize the I2C hardware
> + * @mode: operation mode - DW_IC_MASTER or DW_IC_SLAVE
> *
> * 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.
> @@ -282,6 +283,7 @@ 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);
> + int mode;
> };
>
> #define ACCESS_SWAP 0x00000001
> diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
> index 1f38c807be5f..2ea6d0d25a01 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.
> *
> @@ -174,9 +174,13 @@ 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;
> @@ -189,6 +193,28 @@ 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))
> @@ -302,9 +328,10 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
> if (ret)
> goto exit_reset;
>
> - 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)) {
> @@ -333,7 +360,11 @@ 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)
> goto exit_probe;
>
> --
> 2.13.0
>
>
--
With Best Regards,
Andy Shevchenko
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