Re: [PATCH 2/4] i2c: qup: Add support for Fast Mode Plus

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On 4/25/2018 2:51 AM, Austin Christ wrote:
> Previously the QUP driver limited operation mode to I2C Fast Mode. Add
> Fast Mode Plus functionality by raising SCL limit from 400kHz to 1MHz.
> 
> Signed-off-by: Austin Christ <austinwc@xxxxxxxxxxxxxx>

 Reviewed-by: Sricharan R <sricharan@xxxxxxxxxxxxxx>

Regards,
 Sricharan



> ---
>  drivers/i2c/busses/i2c-qup.c | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-qup.c b/drivers/i2c/busses/i2c-qup.c
> index c024f85..ce5f215 100644
> --- a/drivers/i2c/busses/i2c-qup.c
> +++ b/drivers/i2c/busses/i2c-qup.c
> @@ -136,8 +136,13 @@
>   */
>  #define TOUT_MIN			2
>  
> +/* I2C Frequency Modes */
> +#define I2C_STANDARD_FREQ		100000
> +#define I2C_FAST_MODE_FREQ		400000
> +#define I2C_FAST_MODE_PLUS_FREQ		1000000
> +
>  /* Default values. Use these if FW query fails */
> -#define DEFAULT_CLK_FREQ 100000
> +#define DEFAULT_CLK_FREQ I2C_STANDARD_FREQ
>  #define DEFAULT_SRC_CLK 20000000
>  
>  /*
> @@ -1745,8 +1750,8 @@ static int qup_i2c_probe(struct platform_device *pdev)
>  	}
>  
>  nodma:
> -	/* We support frequencies up to FAST Mode (400KHz) */
> -	if (!clk_freq || clk_freq > 400000) {
> +	/* We support frequencies up to FAST Mode Plus (1MHz) */
> +	if (!clk_freq || clk_freq > I2C_FAST_MODE_PLUS_FREQ) {
>  		dev_err(qup->dev, "clock frequency not supported %d\n",
>  			clk_freq);
>  		return -EINVAL;
> 

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