Subject: [PATCH v2 2/5] i2c: mv64xxx: Add support for the Allwinner A31 I2C driver

From: [email-masked] (Gregory CLEMENT)
Date: Wed, 26 Feb 2014 10:54:35 +0100

Hi Maxime,

On 13/01/2014 11:34, Maxime Ripard wrote:
> The Allwinner A31 I2C controller is almost identical to the one used in the
> other Allwinner SoCs, except for the fact that it needs to clear the interrupt
> by setting the INT_FLAGS bit in the control register, instead of clearing it.

This patch doesn't apply on v3.14-rc4. Even by reducing the context the part
on i2c-mv64xxx.txt failed to be applied. I removed this part and I reduced the
context to one to be able to apply the part in the driver, it allowed me to
test it on Armada 370, and then you can also add my:

Reviewed-by: Gregory CLEMENT <[email-masked]>
Tested-by: Gregory CLEMENT <[email-masked]>

Gregory

> 
> Signed-off-by: Maxime Ripard <[email-masked]>
> ---
>  Documentation/devicetree/bindings/i2c/i2c-mv64xxx.txt |  9 ++++++---
>  drivers/i2c/busses/i2c-mv64xxx.c                      | 10 ++++++++++
>  2 files changed, 16 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/i2c/i2c-mv64xxx.txt b/Documentation/devicetree/bindings/i2c/i2c-mv64xxx.txt
> index 603003a..2763225 100644
> --- a/Documentation/devicetree/bindings/i2c/i2c-mv64xxx.txt
> +++ b/Documentation/devicetree/bindings/i2c/i2c-mv64xxx.txt
> @@ -4,15 +4,18 @@
>  Required properties :
>  
>   - reg             : Offset and length of the register set for the device
> - - compatible      : Should be "marvell,mv64xxx-i2c" or "allwinner,sun4i-i2c"
> -                     or "marvell,mv78230-i2c"
> + - compatible      : Should be "marvell,mv64xxx-i2c", "allwinner,sun4i-i2c",
> +                     "marvell,mv78230-i2c" or "allwinner,sun6i-a31-i2c"
>   - interrupts      : The interrupt number
>  
>  Optional properties :
>  
>   - clock-frequency : Desired I2C bus clock frequency in Hz. If not set the
>  default frequency is 100kHz
> - - resets          : phandle to the parent reset controller
> +
> + - resets          : phandle to the parent reset controller. Mandatory
> +                     whenever you're using the "allwinner,sun6i-a31-i2c"
> +                     compatible.
>  
>  Examples:
>  
> diff --git a/drivers/i2c/busses/i2c-mv64xxx.c b/drivers/i2c/busses/i2c-mv64xxx.c
> index 0f6dde5..12ecf4b 100644
> --- a/drivers/i2c/busses/i2c-mv64xxx.c
> +++ b/drivers/i2c/busses/i2c-mv64xxx.c
> @@ -151,6 +151,7 @@ struct mv64xxx_i2c_data {
>  /* 5us delay in order to avoid repeated start timing violation */
>  	bool			errata_delay;
>  	struct reset_control	*rstc;
> +	bool			irq_clear_inverted;
>  };
>  
>  static struct mv64xxx_i2c_regs mv64xxx_i2c_regs_mv64xxx = {
> @@ -568,6 +569,11 @@ mv64xxx_i2c_intr(int irq, void *dev_id)
>  		status = readl(drv_data->reg_base + drv_data->reg_offsets.status);
>  		mv64xxx_i2c_fsm(drv_data, status);
>  		mv64xxx_i2c_do_action(drv_data);
> +
> +		if (drv_data->irq_clear_inverted)
> +			writel(drv_data->cntl_bits | MV64XXX_I2C_REG_CONTROL_IFLG,
> +			       drv_data->reg_base + drv_data->reg_offsets.control);
> +
>  		rc = IRQ_HANDLED;
>  	}
>  	spin_unlock_irqrestore(&drv_data->lock, flags);
> @@ -692,6 +698,7 @@ static const struct i2c_algorithm mv64xxx_i2c_algo = {
>   */
>  static const struct of_device_id mv64xxx_i2c_of_match_table[] = {
>  	{ .compatible = "allwinner,sun4i-i2c", .data = &mv64xxx_i2c_regs_sun4i},
> +	{ .compatible = "allwinner,sun6i-a31-i2c", .data = &mv64xxx_i2c_regs_sun4i},
>  	{ .compatible = "marvell,mv64xxx-i2c", .data = &mv64xxx_i2c_regs_mv64xxx},
>  	{ .compatible = "marvell,mv78230-i2c", .data = &mv64xxx_i2c_regs_mv64xxx},
>  	{}
> @@ -795,6 +802,9 @@ mv64xxx_of_config(struct mv64xxx_i2c_data *drv_data,
>  		drv_data->errata_delay = true;
>  	}
>  
> +	if (of_device_is_compatible(np, "allwinner,sun6i-a31-i2c"))
> +		drv_data->irq_clear_inverted = true;
> +
>  out:
>  	return rc;
>  #endif
> 

-- 
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com