Re: [PATCH 7/7] i2c: qcom-geni: Use geni_se_set_rate() for setting source clock frequency

[Mukesh Savaliya <mukesh.savaliya@oss.qualcomm.com>]

On 8/5/2026 1:27 AM, Praveen Talari wrote:
> On the SA8255P platform there is no Linux clock handler for the SE source
> clock; resources are instead managed by firmware via a genpd performance
> domain. The I2C driver therefore relies on geni_se_set_rate() to apply the
> fixed 19.2 MHz source clock frequency expected by the SCL divider and

somewhere it's 32 MHz also and this may change too ?

> counter values programmed by qcom_geni_i2c_conf().
> 
> Call geni_se_set_rate() directly from qcom_geni_i2c_conf() so the
> configured frequency is applied to the correct device (the perf domain
> device on the firmware-managed path, or se->dev otherwise) without the I2C
> driver needing to know which resources_init() variant is in use.
> 
> Drop the now-unused set_rate field from struct geni_i2c_desc, the
> geni_se_set_perf_opp() usage on the SA8255P variant, and the unused freq
> parameter from qcom_geni_i2c_conf().
> 
> Signed-off-by: Praveen Talari <praveen.talari@oss.qualcomm.com>
> ---
>   drivers/i2c/busses/i2c-qcom-geni.c | 13 +++++++------
>   1 file changed, 7 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c
> index a23554d101fd..4561e2d235d5 100644
> --- a/drivers/i2c/busses/i2c-qcom-geni.c
> +++ b/drivers/i2c/busses/i2c-qcom-geni.c
> @@ -213,11 +213,11 @@ static int geni_i2c_clk_map_idx(struct geni_i2c_dev *gi2c)
>   	return -EINVAL;
>   }
>   
> -static int qcom_geni_i2c_conf(struct geni_se *se, unsigned long freq)
> +static int qcom_geni_i2c_conf(struct geni_se *se)
>   {
>   	struct geni_i2c_dev *gi2c = dev_get_drvdata(se->dev);
>   	const struct geni_i2c_clk_fld *itr = gi2c->clk_fld;
> -	u32 val;
> +	u32 val, ret;
>   
>   	writel_relaxed(0, gi2c->se.base + SE_GENI_CLK_SEL);
>   
> @@ -233,6 +233,10 @@ static int qcom_geni_i2c_conf(struct geni_se *se, unsigned long freq)
>   				 itr->clk_div, itr->t_high_cnt,
>   				 itr->t_low_cnt, itr->t_cycle_cnt);
>   
> +	ret = geni_se_set_rate(&gi2c->se, 19200000);

hard code ?
May work currently, but if higher frequency support added, source may 
change.

Also you have added in commit message, but add a comment also here.

> +	if (ret)
> +		return ret;
> +
>   	return geni_icc_set_bw_ab(&gi2c->se, GENI_DEFAULT_BW, GENI_DEFAULT_BW,
>   				  Bps_to_icc(gi2c->clk_freq_out));
>   }

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