linux-kernel - Re: [PATCH v10 1/6] interconnect: icc-clk: Allow user to specify master/slave ids

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Message-ID: <4dadb3e5-e2e9-4a42-8020-51104ddca0e1@kernel.org>
Date: Mon, 29 Apr 2024 14:09:43 +0300
From: Georgi Djakov <djakov@...nel.org>
To: Varadarajan Narayanan <quic_varada@...cinc.com>, andersson@...nel.org,
 mturquette@...libre.com, sboyd@...nel.org, robh@...nel.org,
 krzk+dt@...nel.org, conor+dt@...nel.org, konrad.dybcio@...aro.org,
 dmitry.baryshkov@...aro.org, quic_anusha@...cinc.com,
 linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-pm@...r.kernel.org
Subject: Re: [PATCH v10 1/6] interconnect: icc-clk: Allow user to specify
 master/slave ids

On 29.04.24 12:13, Varadarajan Narayanan wrote:
> Presently, icc-clk driver autogenerates the master and slave ids.
> However, devices with multiple nodes on the interconnect could
> have other constraints and may not match with the auto generated
> node ids. Hence, allow the driver to provide the preferred master
> and slave ids.
> 
> Also, update clk-cbf-8996 accordingly.
> 
> Signed-off-by: Varadarajan Narayanan <quic_varada@...cinc.com>

Acked-by: Georgi Djakov <djakov@...nel.org>

> ---
> v9: squash cbf-msm8996 change into this
> v8: Per review feedback, set master/slave ids explicitly. Dont autogenerate
>      https://lore.kernel.org/linux-arm-msm/f1b0d280-6986-4055-a611-2caceb15867d@linaro.org/
> ---
>   drivers/clk/qcom/clk-cbf-8996.c  | 7 ++++++-
>   drivers/interconnect/icc-clk.c   | 6 +++---
>   include/linux/interconnect-clk.h | 2 ++
>   3 files changed, 11 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/clk/qcom/clk-cbf-8996.c b/drivers/clk/qcom/clk-cbf-8996.c
> index fe24b4abeab4..a077d4403967 100644
> --- a/drivers/clk/qcom/clk-cbf-8996.c
> +++ b/drivers/clk/qcom/clk-cbf-8996.c
> @@ -237,7 +237,12 @@ static int qcom_msm8996_cbf_icc_register(struct platform_device *pdev, struct cl
>   	struct device *dev = &pdev->dev;
>   	struct clk *clk = devm_clk_hw_get_clk(dev, cbf_hw, "cbf");
>   	const struct icc_clk_data data[] = {
> -		{ .clk = clk, .name = "cbf", },
> +		{
> +			.clk = clk,
> +			.name = "cbf",
> +			.master_id = MASTER_CBF_M4M,
> +			.slave_id = SLAVE_CBF_M4M,
> +		},
>   	};
>   	struct icc_provider *provider;
>   
> diff --git a/drivers/interconnect/icc-clk.c b/drivers/interconnect/icc-clk.c
> index d787f2ea36d9..2be193fd7d8f 100644
> --- a/drivers/interconnect/icc-clk.c
> +++ b/drivers/interconnect/icc-clk.c
> @@ -108,7 +108,7 @@ struct icc_provider *icc_clk_register(struct device *dev,
>   	for (i = 0, j = 0; i < num_clocks; i++) {
>   		qp->clocks[i].clk = data[i].clk;
>   
> -		node = icc_node_create(first_id + j);
> +		node = icc_node_create(first_id + data[i].master_id);
>   		if (IS_ERR(node)) {
>   			ret = PTR_ERR(node);
>   			goto err;
> @@ -118,10 +118,10 @@ struct icc_provider *icc_clk_register(struct device *dev,
>   		node->data = &qp->clocks[i];
>   		icc_node_add(node, provider);
>   		/* link to the next node, slave */
> -		icc_link_create(node, first_id + j + 1);
> +		icc_link_create(node, first_id + data[i].slave_id);
>   		onecell->nodes[j++] = node;
>   
> -		node = icc_node_create(first_id + j);
> +		node = icc_node_create(first_id + data[i].slave_id);
>   		if (IS_ERR(node)) {
>   			ret = PTR_ERR(node);
>   			goto err;
> diff --git a/include/linux/interconnect-clk.h b/include/linux/interconnect-clk.h
> index 0cd80112bea5..170898faaacb 100644
> --- a/include/linux/interconnect-clk.h
> +++ b/include/linux/interconnect-clk.h
> @@ -11,6 +11,8 @@ struct device;
>   struct icc_clk_data {
>   	struct clk *clk;
>   	const char *name;
> +	unsigned int master_id;
> +	unsigned int slave_id;
>   };
>   
>   struct icc_provider *icc_clk_register(struct device *dev,