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Message-ID: <c8b951b0-6412-d905-99e1-6350283b57c1@linaro.org>
Date: Mon, 4 Jan 2021 20:36:04 +0200
From: Georgi Djakov <georgi.djakov@...aro.org>
To: Henry Chen <henryc.chen@...iatek.com>,
Rob Herring <robh+dt@...nel.org>,
Matthias Brugger <matthias.bgg@...il.com>,
Stephen Boyd <swboyd@...omium.org>,
Ryan Case <ryandcase@...omium.org>,
Mark Brown <broonie@...nel.org>
Cc: Mark Rutland <mark.rutland@....com>,
Nicolas Boichat <drinkcat@...gle.com>,
Fan Chen <fan.chen@...iatek.com>,
James Liao <jamesjj.liao@...iatek.com>,
Arvin Wang <arvin.wang@...iatek.com>,
devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
linux-pm@...r.kernel.org
Subject: Re: [PATCH V6 08/13] interconnect: mediatek: Add interconnect
provider driver
On 12/24/20 08:08, Henry Chen wrote:
> Introduce Mediatek MT6873/MT8183/MT8192 specific provider driver
> using the interconnect framework.
>
> ICC provider ICC Nodes
> ---- ----
> --------- |CPU | |--- |VPU |
> ----- | |----- ---- | ----
> |DRAM |--|DRAM | ---- | ----
> | |--|scheduler|----- |GPU | |--- |DISP|
> | |--|(EMI) | ---- | ----
> | |--| | ----- | ----
> ----- | |----- |MMSYS|--|--- |VDEC|
> --------- ----- | ----
> /|\ | ----
> |change DRAM freq |--- |VENC|
> ---------- | ----
> | DVFSR | |
> | | | ----
> ---------- |--- |IMG |
> | ----
> | ----
> |--- |CAM |
> ----
>
> Signed-off-by: Henry Chen <henryc.chen@...iatek.com>
> ---
> drivers/interconnect/Kconfig | 1 +
> drivers/interconnect/Makefile | 1 +
> drivers/interconnect/mediatek/Kconfig | 13 ++
> drivers/interconnect/mediatek/Makefile | 3 +
> drivers/interconnect/mediatek/mtk-emi.c | 330 ++++++++++++++++++++++++++++++++
> 5 files changed, 348 insertions(+)
> create mode 100644 drivers/interconnect/mediatek/Kconfig
> create mode 100644 drivers/interconnect/mediatek/Makefile
> create mode 100644 drivers/interconnect/mediatek/mtk-emi.c
>
> diff --git a/drivers/interconnect/Kconfig b/drivers/interconnect/Kconfig
> index 5b7204e..e939f5a 100644
> --- a/drivers/interconnect/Kconfig
> +++ b/drivers/interconnect/Kconfig
> @@ -13,5 +13,6 @@ if INTERCONNECT
>
> source "drivers/interconnect/imx/Kconfig"
> source "drivers/interconnect/qcom/Kconfig"
> +source "drivers/interconnect/mediatek/Kconfig"
Sort alphabetically please.
>
> endif
> diff --git a/drivers/interconnect/Makefile b/drivers/interconnect/Makefile
> index d203520..0643a24 100644
> --- a/drivers/interconnect/Makefile
> +++ b/drivers/interconnect/Makefile
> @@ -6,3 +6,4 @@ icc-core-objs := core.o bulk.o
> obj-$(CONFIG_INTERCONNECT) += icc-core.o
> obj-$(CONFIG_INTERCONNECT_IMX) += imx/
> obj-$(CONFIG_INTERCONNECT_QCOM) += qcom/
> +obj-$(CONFIG_INTERCONNECT_MTK) += mediatek/
Ditto.
> diff --git a/drivers/interconnect/mediatek/Kconfig b/drivers/interconnect/mediatek/Kconfig
> new file mode 100644
> index 0000000..972d3bb
> --- /dev/null
> +++ b/drivers/interconnect/mediatek/Kconfig
> @@ -0,0 +1,13 @@
> +config INTERCONNECT_MTK
> + bool "Mediatek Network-on-Chip interconnect drivers"
> + depends on ARCH_MEDIATEK
> + help
> + Support for Mediatek's Network-on-Chip interconnect hardware.
> +
> +config INTERCONNECT_MTK_EMI
> + tristate "Mediatek EMI interconnect driver"
> + depends on INTERCONNECT_MTK
> + depends on (MTK_DVFSRC && OF)
Would it be possible to enable COMPILE_TEST?
> + help
> + This is a driver for the Mediatek Network-on-Chip on DVFSRC-based
> + platforms.
> diff --git a/drivers/interconnect/mediatek/Makefile b/drivers/interconnect/mediatek/Makefile
> new file mode 100644
> index 0000000..353842b
> --- /dev/null
> +++ b/drivers/interconnect/mediatek/Makefile
> @@ -0,0 +1,3 @@
> +# SPDX-License-Identifier: GPL-2.0
> +
> +obj-$(CONFIG_INTERCONNECT_MTK_EMI) += mtk-emi.o
> \ No newline at end of file
> diff --git a/drivers/interconnect/mediatek/mtk-emi.c b/drivers/interconnect/mediatek/mtk-emi.c
> new file mode 100644
> index 0000000..9670077
> --- /dev/null
> +++ b/drivers/interconnect/mediatek/mtk-emi.c
> @@ -0,0 +1,330 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2020, The Linux Foundation. All rights reserved.
Just a reminder that the year should be updated when you re-submit.
> + *
> + */
> +
> +#include <linux/device.h>
> +#include <linux/interconnect-provider.h>
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/soc/mediatek/mtk_dvfsrc.h>
> +#include <dt-bindings/interconnect/mtk,mt8183-emi.h>
> +#include <dt-bindings/interconnect/mtk,mt6873-emi.h>
Nit: Alphanumeric order please.
[..]
> +static int emi_icc_remove(struct platform_device *pdev);
> +static int emi_icc_probe(struct platform_device *pdev)
> +{
> + const struct of_device_id *match;
> + const struct mtk_icc_desc *desc;
> + struct device *dev = &pdev->dev;
> + struct icc_node *node;
> + struct icc_onecell_data *data;
> + struct icc_provider *provider;
> + struct mtk_icc_node **mnodes;
> + size_t num_nodes, i, j;
> + int ret;
> +
> + match = of_match_node(emi_icc_of_match, dev->parent->of_node);
> +
> + if (!match) {
> + dev_err(dev, "invalid compatible string\n");
> + return -ENODEV;
> + }
> +
> + desc = match->data;
> + mnodes = desc->nodes;
> + num_nodes = desc->num_nodes;
> +
> + provider = devm_kzalloc(dev, sizeof(*provider), GFP_KERNEL);
> + if (!provider)
> + return -ENOMEM;
> +
> + data = devm_kzalloc(dev, struct_size(data, nodes, num_nodes),
> + GFP_KERNEL);
> + if (!data)
> + return -ENOMEM;
> +
> + provider->dev = pdev->dev.parent;
> + provider->set = emi_icc_set;
> + provider->aggregate = emi_icc_aggregate;
> + provider->xlate = of_icc_xlate_onecell;
> + INIT_LIST_HEAD(&provider->nodes);
> + provider->data = data;
> +
> + ret = icc_provider_add(provider);
> + if (ret) {
> + dev_err(&pdev->dev, "error adding interconnect provider\n");
> + return ret;
> + }
> +
> + for (i = 0; i < num_nodes; i++) {
> + node = icc_node_create(mnodes[i]->id);
> + if (IS_ERR(node)) {
> + ret = PTR_ERR(node);
> + goto err;
> + }
> +
> + node->name = mnodes[i]->name;
> + node->data = mnodes[i];
> + icc_node_add(node, provider);
> +
> + for (j = 0; j < mnodes[i]->num_links; j++)
> + icc_link_create(node, mnodes[i]->links[j]);
> +
> + data->nodes[i] = node;
> + }
> + data->num_nodes = num_nodes;
> +
> + platform_set_drvdata(pdev, provider);
> +
> + return 0;
> +err:
> + icc_nodes_remove(provider);
Also call icc_provider_del() to restore the original state on error.
Thanks,
Georgi
> + return ret;
> +}
> +
> +static int emi_icc_remove(struct platform_device *pdev)
> +{
> + struct icc_provider *provider = platform_get_drvdata(pdev);
> +
> + icc_nodes_remove(provider);
> + return icc_provider_del(provider);
> +}
> +
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