Re: [PATCH V6 08/13] interconnect: mediatek: Add interconnect provider driver

[Henry Chen <henryc.chen@mediatek.com>]

On Mon, 2021-01-04 at 20:36 +0200, Georgi Djakov wrote:
> 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@mediatek.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.
Ok
> 
> >   
> >   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.
Ok
> 
> > 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?
Do you means change to "depends on (MTK_DVFSRC && OF) || 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.
OK, thanks for reminding me.
> 
> > + *
> > + */
> > +
> > +#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.
OK.
> 
> [..]
> > +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.
OK.

Thanks,
Henry
> 
> 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);
> > +}
> > +