Re: [PATCH v3 2/3] soc: mediatek: mtk-socinfo: Add driver for getting chip information

[AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>]

Il 20/12/23 11:39, William-tw Lin ha scritto:
> Add driver for socinfo retrieval. This patch includes the following:
> 1. mtk-socinfo driver for chip info retrieval
> 2. Related changes to Makefile and Kconfig
> 
> Signed-off-by: William-tw Lin <william-tw.lin@mediatek.com>
> ---
>   drivers/soc/mediatek/Kconfig       |   8 ++
>   drivers/soc/mediatek/Makefile      |   1 +
>   drivers/soc/mediatek/mtk-socinfo.c | 186 +++++++++++++++++++++++++++++
>   3 files changed, 195 insertions(+)
>   create mode 100644 drivers/soc/mediatek/mtk-socinfo.c
> 
> diff --git a/drivers/soc/mediatek/Kconfig b/drivers/soc/mediatek/Kconfig
> index 0810b5b0c688..f34d93977ba6 100644
> --- a/drivers/soc/mediatek/Kconfig
> +++ b/drivers/soc/mediatek/Kconfig
> @@ -68,4 +68,12 @@ config MTK_SVS
>   	  chip process corner, temperatures and other factors. Then DVFS
>   	  driver could apply SVS bank voltage to PMIC/Buck.
>   
> +config MTK_SOCINFO
> +	tristate "MediaTek SoC Information"
> +	default y

Add the dependency please.

	depends on NVMEM_MTK_EFUSE

> +	help
> +	  The MediaTek SoC Information (mtk-socinfo) driver provides
> +	  information about the SoC to the userspace including the
> +	  manufacturer name, marketing name and soc name.
> +
>   endmenu
> diff --git a/drivers/soc/mediatek/Makefile b/drivers/soc/mediatek/Makefile
> index 9d3ce7878c5c..6830512848fd 100644
> --- a/drivers/soc/mediatek/Makefile
> +++ b/drivers/soc/mediatek/Makefile
> @@ -7,3 +7,4 @@ obj-$(CONFIG_MTK_REGULATOR_COUPLER) += mtk-regulator-coupler.o
>   obj-$(CONFIG_MTK_MMSYS) += mtk-mmsys.o
>   obj-$(CONFIG_MTK_MMSYS) += mtk-mutex.o
>   obj-$(CONFIG_MTK_SVS) += mtk-svs.o
> +obj-$(CONFIG_MTK_SOCINFO) += mtk-socinfo.o
> diff --git a/drivers/soc/mediatek/mtk-socinfo.c b/drivers/soc/mediatek/mtk-socinfo.c
> new file mode 100644
> index 000000000000..4a257b5c8eda
> --- /dev/null
> +++ b/drivers/soc/mediatek/mtk-socinfo.c
> @@ -0,0 +1,186 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2023 MediaTek Inc.
> + */
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_platform.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/nvmem-consumer.h>
> +#include <linux/device.h>
> +#include <linux/debugfs.h>
> +#include <linux/seq_file.h>
> +#include <linux/string.h>
> +#include <linux/sys_soc.h>
> +#include <linux/slab.h>
> +#include <linux/platform_device.h>
> +
> +#define MTK_SOCINFO_ENTRY(_soc_name, _segment_name, _marketing_name, _cell_data1, _cell_data2) {\
> +	.soc_name = _soc_name,									\
> +	.segment_name = _segment_name,								\
> +	.marketing_name = _marketing_name,							\
> +	.cell_data = {_cell_data1, _cell_data2}							\
> +}
> +#define CELL_NOT_USED (0xFFFFFFFF)
> +#define MAX_CELLS (2)
> +
> +struct mtk_socinfo {
> +	struct device *dev;
> +	struct name_data *name_data;
> +	struct socinfo_data *socinfo_data;
> +	struct soc_device *soc_dev;
> +};
> +
> +struct socinfo_data {
> +	char *soc_name;
> +	char *segment_name;
> +	char *marketing_name;
> +	u32 cell_data[MAX_CELLS];
> +};
> +
> +static const char *cell_names[MAX_CELLS] = {"socinfo-data1", "socinfo-data2"};
> +
> +static struct socinfo_data socinfo_data_table[] = {
> +	MTK_SOCINFO_ENTRY("MT8173", "MT8173V/AC", "MT8173", 0x6CA20004, 0x10000000),
> +	MTK_SOCINFO_ENTRY("MT8183", "MT8183V/AZA", "Kompanio 500", 0x00010043, 0x00000840),
> +	MTK_SOCINFO_ENTRY("MT8186", "MT8186GV/AZA", "Kompanio 520", 0x81861001, CELL_NOT_USED),
> +	MTK_SOCINFO_ENTRY("MT8186T", "MT8186TV/AZA", "Kompanio 528", 0x81862001, CELL_NOT_USED),
> +	MTK_SOCINFO_ENTRY("MT8188", "MT8188GV/AZA", "Kompanio 830", 0x81880000, 0x00000010),
> +	MTK_SOCINFO_ENTRY("MT8188", "MT8188GV/HZA", "Kompanio 830", 0x81880000, 0x00000011),
> +	MTK_SOCINFO_ENTRY("MT8192", "MT8192V/AZA", "Kompanio 820", 0x00001100, 0x00040080),
> +	MTK_SOCINFO_ENTRY("MT8192T", "MT8192V/ATZA", "Kompanio 828", 0x00000100, 0x000400C0),
> +	MTK_SOCINFO_ENTRY("MT8195", "MT8195GV/EZA", "Kompanio 1200", 0x81950300, CELL_NOT_USED),
> +	MTK_SOCINFO_ENTRY("MT8195", "MT8195GV/EHZA", "Kompanio 1200", 0x81950304, CELL_NOT_USED),
> +	MTK_SOCINFO_ENTRY("MT8195", "MT8195TV/EZA", "Kompanio 1380", 0x81950400, CELL_NOT_USED),
> +	MTK_SOCINFO_ENTRY("MT8195", "MT8195TV/EHZA", "Kompanio 1380", 0x81950404, CELL_NOT_USED),
> +};
> +
> +static int mtk_socinfo_create_socinfo_node(struct mtk_socinfo *mtk_socinfop)
> +{
> +	struct soc_device_attribute *attrs;
> +	static char machine[30] = {0};
> +	static const char *soc_manufacturer = "MediaTek";
> +
> +	attrs = devm_kzalloc(mtk_socinfop->dev, sizeof(*attrs), GFP_KERNEL);
> +	if (!attrs)
> +		return -ENOMEM;
> +
> +	snprintf(machine, sizeof(machine), "%s (%s)", mtk_socinfop->socinfo_data->marketing_name,
> +		mtk_socinfop->socinfo_data->soc_name);
> +	attrs->family = soc_manufacturer;
> +	attrs->machine = machine;
> +
> +	mtk_socinfop->soc_dev = soc_device_register(attrs);
> +	if (IS_ERR(mtk_socinfop->soc_dev))
> +		return PTR_ERR(mtk_socinfop->soc_dev);
> +
> +	dev_info(mtk_socinfop->dev, "%s %s SoC detected.\n", soc_manufacturer, attrs->machine);
> +	return 0;
> +}
> +
> +static u32 mtk_socinfo_read_cell(struct device *dev, const char *name)
> +{
> +	struct nvmem_device *nvmemp;
> +	struct device_node *np = dev->of_node;
> +	u32 offset;
> +	u32 cell_val = CELL_NOT_USED;
> +
> +	nvmemp = devm_nvmem_device_get(dev, "mtk-efuse0");

Are you sure that this is supposed to be "mtk-efuse0" and not "mtk-efuse"?
Looks strange.

Everything else looks ok.

Cheers,
Angelo