linux-kernel - Re: [PATCH v11 2/2] memory: mtk-smi: mt8188: Add SMI reset and clamp

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Message-ID: <3ecf0545-513f-4a84-9772-f6cecc50f48b@kernel.org>
Date: Sat, 18 Oct 2025 18:41:48 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Friday Yang <friday.yang@...iatek.com>, Yong Wu <yong.wu@...iatek.com>,
 Rob Herring <robh@...nel.org>, Conor Dooley <conor+dt@...nel.org>,
 Matthias Brugger <matthias.bgg@...il.com>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
 Philipp Zabel <p.zabel@...gutronix.de>
Cc: linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v11 2/2] memory: mtk-smi: mt8188: Add SMI reset and clamp

On 17/09/2025 14:07, Friday Yang wrote:
>  static int mtk_smi_device_link_common(struct device *dev, struct device **com_dev)
>  {
>  	struct platform_device *smi_com_pdev;
> @@ -638,6 +711,46 @@ static int mtk_smi_dts_clk_init(struct device *dev, struct mtk_smi *smi,
>  	return ret;
>  }
> 
> +static int mtk_smi_larb_parse_syscon(struct mtk_smi_larb *larb, int larbid)
> +{
> +	struct device *dev = larb->dev;
> +	const struct mtk_smi_larb_gen *larb_gen = larb->larb_gen;
> +	int ret;
> +
> +	larb->smi_comm_in_port_id = larb_gen->clamp_port[larbid];
> +	larb->smi_comm_syscon = syscon_regmap_lookup_by_phandle(dev->of_node,
> +								"mediatek,smi");

The code already parses this phandle (in other place). Why do you need
second time?

> +	if (IS_ERR(larb->smi_comm_syscon)) {
> +		ret = PTR_ERR(larb->smi_comm_syscon);
> +		larb->smi_comm_syscon = NULL;
> +		return dev_err_probe(dev, ret,
> +				     "Failed to get smi syscon for larb %d\n", larbid);
> +	}
> +
> +	return 0;
> +}
> +
> +static int mtk_smi_larb_parse_reset(struct mtk_smi_larb *larb)
> +{
> +	struct device *dev = larb->dev;
> +	int ret;
> +
> +	larb->rst_con = devm_reset_control_get_exclusive(dev, "larb");
> +	if (IS_ERR(larb->rst_con))
> +		return dev_err_probe(dev, PTR_ERR(larb->rst_con),
> +				     "Failed to get reset controller\n");


This looks like ABI break. Aren't all devices affected?

> +
> +	larb->nb.notifier_call = mtk_smi_genpd_callback;
> +	ret = dev_pm_genpd_add_notifier(dev, &larb->nb);
> +	if (ret) {
> +		larb->nb.notifier_call = NULL;
> +		return dev_err_probe(dev, ret,
> +				     "Failed to add genpd callback\n");
> +	}
> +
> +	return 0;
> +}
> +
Best regards,
Krzysztof