On 15/09/2023 17:26, William-tw Lin wrote: > 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@xxxxxxxxxxxx> > --- > drivers/soc/mediatek/Kconfig | 9 ++ > drivers/soc/mediatek/Makefile | 1 + > drivers/soc/mediatek/mtk-socinfo.c | 166 +++++++++++++++++++++++++++++ > 3 files changed, 176 insertions(+) > create mode 100644 drivers/soc/mediatek/mtk-socinfo.c > > diff --git a/drivers/soc/mediatek/Kconfig b/drivers/soc/mediatek/Kconfig > index a88cf04fc803..5746d3b4c67d 100644 > --- a/drivers/soc/mediatek/Kconfig > +++ b/drivers/soc/mediatek/Kconfig > @@ -91,4 +91,13 @@ 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 SOCINFO" > + depends on MTK_EFUSE && NVMEM > + help > + Say y here to enable mtk socinfo information. > + This enables a sysfs node which shows attributes of MTK soc info. > + Information of soc info includes the manufacturer, the marketing > + name, and the soc used. > + > 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..fe5a68925f58 > --- /dev/null > +++ b/drivers/soc/mediatek/mtk-socinfo.c > @@ -0,0 +1,166 @@ > +// 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> > + > +#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 socinfo_data { > + char *soc_name; > + char *segment_name; > + char *marketing_name; > + u32 cell_data[MAX_CELLS]; > +}; > + > +const char *soc_manufacturer = "MediaTek"; Drop, not needed, not even static/ > +struct soc_device *soc_dev; Drop. First, it's not even static. You cannot have global variables. Second, it's not even used... This is some poor code. > +char *cell_names[MAX_CELLS] = {"socinfo-data1", "socinfo-data2"}; static > + > +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}; > + > + attrs = devm_kzalloc(mtk_socinfop->dev, sizeof(*attrs), GFP_KERNEL); > + if (!attrs) > + return -ENOMEM; > + > + snprintf(machine, 30, "%s (%s)", mtk_socinfop->socinfo_data->marketing_name, > + mtk_socinfop->socinfo_data->soc_name); > + attrs->family = soc_manufacturer; > + attrs->machine = machine; > + > + soc_dev = soc_device_register(attrs); > + if (IS_ERR(soc_dev)) > + return PTR_ERR(soc_dev); > + > + dev_info(mtk_socinfop->dev, "%s SoC detected.\n", attrs->machine); > + return 0; > +} > + > +static int mtk_socinfo_get_socinfo_data(struct mtk_socinfo *mtk_socinfop) > +{ > + unsigned int i = 0, j = 0; > + unsigned int num_cell_data = 0; > + u32 *cell_datap[MAX_CELLS] = { NULL }; > + size_t efuse_bytes; > + struct nvmem_cell *cell; > + bool match_socinfo = true; > + int match_socinfo_index = -1; > + > + for (i = 0; i < MAX_CELLS; i++) { > + cell = nvmem_cell_get(mtk_socinfop->dev, cell_names[i]); > + if (IS_ERR_OR_NULL(cell)) > + break; > + cell_datap[i] = (u32 *)nvmem_cell_read(cell, &efuse_bytes); > + nvmem_cell_put(cell); > + num_cell_data++; > + } > + > + if (!num_cell_data) > + return -ENOENT; > + > + for (i = 0; i < ARRAY_SIZE(socinfo_data_table); i++) { > + match_socinfo = true; > + for (j = 0; j < num_cell_data; j++) { > + if (*(cell_datap[j]) != socinfo_data_table[i].cell_data[j]) > + match_socinfo = false; > + } > + if (num_cell_data > 0 && match_socinfo) { > + mtk_socinfop->socinfo_data = &(socinfo_data_table[i]); > + match_socinfo_index = i; > + break; > + } > + } > + > + return match_socinfo_index >= 0 ? match_socinfo_index : -ENOENT; > +} > + > +static const struct of_device_id mtk_socinfo_id_table[] = { > + { .compatible = "mediatek,socinfo" }, > + { /* sentinel */ }, > +}; > +MODULE_DEVICE_TABLE(of, mtk_socinfo_id_table); > + > +static int mtk_socinfo_probe(struct platform_device *pdev) > +{ > + struct mtk_socinfo *mtk_socinfop; > + int ret = 0; > + > + mtk_socinfop = devm_kzalloc(&pdev->dev, sizeof(*mtk_socinfop), GFP_KERNEL); > + if (!mtk_socinfop) > + return -ENOMEM; > + > + mtk_socinfop->dev = &pdev->dev; > + > + ret = mtk_socinfo_get_socinfo_data(mtk_socinfop); > + if (ret < 0) > + return dev_err_probe(mtk_socinfop->dev, ret, "Failed to get socinfo data\n"); > + > + ret = mtk_socinfo_create_socinfo_node(mtk_socinfop); > + if (ret != 0) > + return dev_err_probe(mtk_socinfop->dev, -EINVAL, "Failed to create socinfo node\n"); Wrap your code according to Linux coding style (see Coding style document, not checkpatch). > + > + return 0; > +} > + > +static int mtk_socinfo_remove(struct platform_device *pdev) > +{ > + if (soc_dev) And how it could be NULL here? This does not make any sense. > + soc_device_unregister(soc_dev); > + return 0; > +} > + > +static struct platform_driver mtk_socinfo = { > + .probe = mtk_socinfo_probe, > + .remove = mtk_socinfo_remove, > + .driver = { > + .name = "mtk_socinfo", > + .owner = THIS_MODULE, Really? We dropped it years ago. Before submitting new drivers, always, *ALWAYS*, run coccinelle, smatch and sparse. Best regards, Krzysztof