linux-kernel - Re: [PATCH v3 03/12] soc: qcom: geni-se: Introduce helper API for resource initialization

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Message-ID: <f3a47ca9-643a-4885-b8cf-0e32c6a1ea2f@oss.qualcomm.com>
Date: Fri, 30 Jan 2026 13:10:15 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Praveen Talari <praveen.talari@....qualcomm.com>,
        Andi Shyti <andi.shyti@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>,
        Mukesh Kumar Savaliya <mukesh.savaliya@....qualcomm.com>,
        Viken Dadhaniya <viken.dadhaniya@....qualcomm.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, linux-arm-msm@...r.kernel.org,
        linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, bryan.odonoghue@...aro.org,
        dmitry.baryshkov@....qualcomm.com, bjorn.andersson@....qualcomm.com
Cc: prasad.sodagudi@....qualcomm.com, quic_vtanuku@...cinc.com,
        aniket.randive@....qualcomm.com, chandana.chiluveru@....qualcomm.com
Subject: Re: [PATCH v3 03/12] soc: qcom: geni-se: Introduce helper API for
 resource initialization

On 1/12/26 11:47 AM, Praveen Talari wrote:
> The GENI Serial Engine drivers (I2C, SPI, and SERIAL) currently duplicate
> code for initializing shared resources such as clocks and interconnect
> paths.
> 
> Introduce a new helper API, geni_se_resources_init(), to centralize this
> initialization logic, improving modularity and simplifying the probe
> function.
> 
> Signed-off-by: Praveen Talari <praveen.talari@....qualcomm.com>
> ---
> v1 -> v2:
> From kernel test robot
> - Updated proper return value for devm_pm_opp_set_clkname()
> ---
>  drivers/soc/qcom/qcom-geni-se.c  | 47 ++++++++++++++++++++++++++++++++
>  include/linux/soc/qcom/geni-se.h |  6 ++++
>  2 files changed, 53 insertions(+)
> 
> diff --git a/drivers/soc/qcom/qcom-geni-se.c b/drivers/soc/qcom/qcom-geni-se.c
> index b0542f836453..75e722cd1a94 100644
> --- a/drivers/soc/qcom/qcom-geni-se.c
> +++ b/drivers/soc/qcom/qcom-geni-se.c
> @@ -19,6 +19,7 @@
>  #include <linux/of_platform.h>
>  #include <linux/pinctrl/consumer.h>
>  #include <linux/platform_device.h>
> +#include <linux/pm_opp.h>
>  #include <linux/soc/qcom/geni-se.h>
>  
>  /**
> @@ -1012,6 +1013,52 @@ int geni_icc_disable(struct geni_se *se)
>  }
>  EXPORT_SYMBOL_GPL(geni_icc_disable);
>  
> +/**
> + * geni_se_resources_init() - Initialize resources for a GENI SE device.
> + * @se: Pointer to the geni_se structure representing the GENI SE device.
> + *
> + * This function initializes various resources required by the GENI Serial Engine
> + * (SE) device, including clock resources (core and SE clocks), interconnect
> + * paths for communication.
> + * It retrieves optional and mandatory clock resources, adds an OF-based
> + * operating performance point (OPP) table, and sets up interconnect paths
> + * with default bandwidths. The function also sets a flag (`has_opp`) to
> + * indicate whether OPP support is available for the device.
> + *
> + * Return: 0 on success, or a negative errno on failure.
> + */
> +int geni_se_resources_init(struct geni_se *se)
> +{
> +	int ret;
> +
> +	se->core_clk = devm_clk_get_optional(se->dev, "core");
> +	if (IS_ERR(se->core_clk))
> +		return dev_err_probe(se->dev, PTR_ERR(se->core_clk),
> +				     "Failed to get optional core clk\n");
> +
> +	se->clk = devm_clk_get(se->dev, "se");
> +	if (IS_ERR(se->clk) && !has_acpi_companion(se->dev))
> +		return dev_err_probe(se->dev, PTR_ERR(se->clk),
> +				     "Failed to get SE clk\n");
> +
> +	ret = devm_pm_opp_set_clkname(se->dev, "se");
> +	if (ret)
> +		return ret;
> +
> +	ret = devm_pm_opp_of_add_table(se->dev);
> +	if (ret && ret != -ENODEV)
> +		return dev_err_probe(se->dev, ret, "Failed to add OPP table\n");
> +
> +	se->has_opp = (ret == 0);
> +
> +	ret = geni_icc_get(se, "qup-memory");

The second argument is a NOP after patch 1.. originally I think I had a
cross-subsys patch to get rid of that, neither solution is exactly pretty..

But otherwise, this looks good

Konrad