linux-kernel - Re: [PATCH 04/14] soc: qcom: smd-rpm: Match rpmsg channel instead of compatible

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Date:   Mon, 5 Jun 2023 20:49:13 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Stephan Gerhold <stephan@...hold.net>,
        Bjorn Andersson <andersson@...nel.org>
Cc:     Andy Gross <agross@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-remoteproc@...r.kernel.org
Subject: Re: [PATCH 04/14] soc: qcom: smd-rpm: Match rpmsg channel instead of
 compatible



On 5.06.2023 09:08, Stephan Gerhold wrote:
> There is an ever growing list of compatibles in the smd-rpm.c driver.
> A fallback compatible would help here but would still require keeping
> the current list around for backwards compatibility.
> 
> As an alternative, let's switch the driver to match the rpmsg_device_id
> instead, which is always "rpm_requests" on all platforms. Add a check
> to ensure that there is a device tree node defined for the device since
> otherwise the of_platform_populate() call will operate on the root node (/).
> 
> Similar approaches with matching rpmsg_device_id are already used in
> qcom_sysmon, qcom_glink_ssr, qrtr, and rpmsg_wwan_ctrl.
> 
> Signed-off-by: Stephan Gerhold <stephan@...hold.net>
> ---
Tested-by: Konrad Dybcio <konrad.dybcio@...aro.org> # SM6375 (G-Link)
Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>

Konrad
>  drivers/soc/qcom/smd-rpm.c | 35 +++++++++--------------------------
>  1 file changed, 9 insertions(+), 26 deletions(-)
> 
> diff --git a/drivers/soc/qcom/smd-rpm.c b/drivers/soc/qcom/smd-rpm.c
> index 0c1aa809cc4e..13d8c52330d0 100644
> --- a/drivers/soc/qcom/smd-rpm.c
> +++ b/drivers/soc/qcom/smd-rpm.c
> @@ -199,6 +199,9 @@ static int qcom_smd_rpm_probe(struct rpmsg_device *rpdev)
>  	struct qcom_smd_rpm *rpm;
>  	int ret;
>  
> +	if (!rpdev->dev.of_node)
> +		return -EINVAL;
> +
>  	rpm = devm_kzalloc(&rpdev->dev, sizeof(*rpm), GFP_KERNEL);
>  	if (!rpm)
>  		return -ENOMEM;
> @@ -230,38 +233,18 @@ static void qcom_smd_rpm_remove(struct rpmsg_device *rpdev)
>  	of_platform_depopulate(&rpdev->dev);
>  }
>  
> -static const struct of_device_id qcom_smd_rpm_of_match[] = {
> -	{ .compatible = "qcom,rpm-apq8084" },
> -	{ .compatible = "qcom,rpm-ipq6018" },
> -	{ .compatible = "qcom,rpm-ipq9574" },
> -	{ .compatible = "qcom,rpm-msm8226" },
> -	{ .compatible = "qcom,rpm-msm8909" },
> -	{ .compatible = "qcom,rpm-msm8916" },
> -	{ .compatible = "qcom,rpm-msm8936" },
> -	{ .compatible = "qcom,rpm-msm8953" },
> -	{ .compatible = "qcom,rpm-msm8974" },
> -	{ .compatible = "qcom,rpm-msm8976" },
> -	{ .compatible = "qcom,rpm-msm8994" },
> -	{ .compatible = "qcom,rpm-msm8996" },
> -	{ .compatible = "qcom,rpm-msm8998" },
> -	{ .compatible = "qcom,rpm-sdm660" },
> -	{ .compatible = "qcom,rpm-sm6115" },
> -	{ .compatible = "qcom,rpm-sm6125" },
> -	{ .compatible = "qcom,rpm-sm6375" },
> -	{ .compatible = "qcom,rpm-qcm2290" },
> -	{ .compatible = "qcom,rpm-qcs404" },
> -	{}
> +static const struct rpmsg_device_id qcom_smd_rpm_id_table[] = {
> +	{ .name = "rpm_requests", },
> +	{ /* sentinel */ }
>  };
> -MODULE_DEVICE_TABLE(of, qcom_smd_rpm_of_match);
> +MODULE_DEVICE_TABLE(rpmsg, qcom_smd_rpm_id_table);
>  
>  static struct rpmsg_driver qcom_smd_rpm_driver = {
>  	.probe = qcom_smd_rpm_probe,
>  	.remove = qcom_smd_rpm_remove,
>  	.callback = qcom_smd_rpm_callback,
> -	.drv  = {
> -		.name  = "qcom_smd_rpm",
> -		.of_match_table = qcom_smd_rpm_of_match,
> -	},
> +	.id_table = qcom_smd_rpm_id_table,
> +	.drv.name = "qcom_smd_rpm",
>  };
>  
>  static int __init qcom_smd_rpm_init(void)
>