platform: mellanox: nvsw-sn2200: Add support for new system flavour

Add support for SN2201 system flavour, which is fitting OCP rack
form-factor and feeded from external power source through the rack
standard busbar interface.

Validate system type through DMI decode.
For new system flavour:
- Skip internal power supply configuration.
- Attach power hotswap device.

Reviewed-by: Michael Shych <michaelsh@nvidia.com>
Signed-off-by: Vadim Pasternak <vadimp@nvidia.com>
Link: https://lore.kernel.org/r/20250504165507.9003-2-vadimp@nvidia.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

1 files changed, 107 insertions, 3 deletions

diff --git a/drivers/platform/mellanox/nvsw-sn2201.c b/drivers/platform/mellanox/nvsw-sn2201.c
index d0e5a18c0303..8c31189a94dd 100644
--- a/drivers/platform/mellanox/nvsw-sn2201.c
+++ b/drivers/platform/mellanox/nvsw-sn2201.c
@@ -6,6 +6,7 @@
  */
 
 #include <linux/device.h>
+#include <linux/dmi.h>
 #include <linux/i2c.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
@@ -104,6 +105,9 @@
 	| NVSW_SN2201_CPLD_AGGR_PSU_MASK_DEF \
 	| NVSW_SN2201_CPLD_AGGR_PWR_MASK_DEF \
 	| NVSW_SN2201_CPLD_AGGR_FAN_MASK_DEF)
+#define NVSW_SN2201_CPLD_AGGR_BUSBAR_MASK_DEF \
+	(NVSW_SN2201_CPLD_AGGR_ASIC_MASK_DEF \
+	| NVSW_SN2201_CPLD_AGGR_FAN_MASK_DEF)
 
 #define NVSW_SN2201_CPLD_ASIC_MASK		GENMASK(3, 1)
 #define NVSW_SN2201_CPLD_PSU_MASK		GENMASK(1, 0)
@@ -132,6 +136,7 @@
  * @cpld_devs: I2C devices for cpld;
  * @cpld_devs_num: number of I2C devices for cpld;
  * @main_mux_deferred_nr: I2C adapter number must be exist prior creating devices execution;
+ * @ext_pwr_source: true if system powered by external power supply; false - by internal;
  */
 struct nvsw_sn2201 {
 	struct device *dev;
@@ -152,6 +157,7 @@ struct nvsw_sn2201 {
 	struct mlxreg_hotplug_device *cpld_devs;
 	int cpld_devs_num;
 	int main_mux_deferred_nr;
+	bool ext_pwr_source;
 };
 
 static bool nvsw_sn2201_writeable_reg(struct device *dev, unsigned int reg)
@@ -522,6 +528,35 @@ struct mlxreg_core_hotplug_platform_data nvsw_sn2201_hotplug = {
 	.mask = NVSW_SN2201_CPLD_AGGR_MASK_DEF,
 };
 
+static struct mlxreg_core_item nvsw_sn2201_busbar_items[] = {
+	{
+		.data = nvsw_sn2201_fan_items_data,
+		.aggr_mask = NVSW_SN2201_CPLD_AGGR_FAN_MASK_DEF,
+		.reg = NVSW_SN2201_FAN_PRSNT_STATUS_OFFSET,
+		.mask = NVSW_SN2201_CPLD_FAN_MASK,
+		.count = ARRAY_SIZE(nvsw_sn2201_fan_items_data),
+		.inversed = 1,
+		.health = false,
+	},
+	{
+		.data = nvsw_sn2201_sys_items_data,
+		.aggr_mask = NVSW_SN2201_CPLD_AGGR_ASIC_MASK_DEF,
+		.reg = NVSW_SN2201_ASIC_STATUS_OFFSET,
+		.mask = NVSW_SN2201_CPLD_ASIC_MASK,
+		.count = ARRAY_SIZE(nvsw_sn2201_sys_items_data),
+		.inversed = 1,
+		.health = false,
+	},
+};
+
+static
+struct mlxreg_core_hotplug_platform_data nvsw_sn2201_busbar_hotplug = {
+	.items = nvsw_sn2201_items,
+	.count = ARRAY_SIZE(nvsw_sn2201_busbar_items),
+	.cell = NVSW_SN2201_SYS_INT_STATUS_OFFSET,
+	.mask = NVSW_SN2201_CPLD_AGGR_BUSBAR_MASK_DEF,
+};
+
 /* SN2201 static devices. */
 static struct i2c_board_info nvsw_sn2201_static_devices[] = {
 	{
@@ -557,6 +592,9 @@ static struct i2c_board_info nvsw_sn2201_static_devices[] = {
 	{
 		I2C_BOARD_INFO("pmbus", 0x40),
 	},
+	{
+		I2C_BOARD_INFO("lm5066i", 0x15),
+	},
 };
 
 /* SN2201 default static board info. */
@@ -607,6 +645,58 @@ static struct mlxreg_hotplug_device nvsw_sn2201_static_brdinfo[] = {
 	},
 };
 
+/* SN2201 default busbar static board info. */
+static struct mlxreg_hotplug_device nvsw_sn2201_busbar_static_brdinfo[] = {
+	{
+		.brdinfo = &nvsw_sn2201_static_devices[0],
+		.nr = NVSW_SN2201_MAIN_NR,
+	},
+	{
+		.brdinfo = &nvsw_sn2201_static_devices[1],
+		.nr = NVSW_SN2201_MAIN_MUX_CH0_NR,
+	},
+	{
+		.brdinfo = &nvsw_sn2201_static_devices[2],
+		.nr = NVSW_SN2201_MAIN_MUX_CH0_NR,
+	},
+	{
+		.brdinfo = &nvsw_sn2201_static_devices[3],
+		.nr = NVSW_SN2201_MAIN_MUX_CH0_NR,
+	},
+	{
+		.brdinfo = &nvsw_sn2201_static_devices[4],
+		.nr = NVSW_SN2201_MAIN_MUX_CH3_NR,
+	},
+	{
+		.brdinfo = &nvsw_sn2201_static_devices[5],
+		.nr = NVSW_SN2201_MAIN_MUX_CH5_NR,
+	},
+	{
+		.brdinfo = &nvsw_sn2201_static_devices[6],
+		.nr = NVSW_SN2201_MAIN_MUX_CH5_NR,
+	},
+	{
+		.brdinfo = &nvsw_sn2201_static_devices[7],
+		.nr = NVSW_SN2201_MAIN_MUX_CH5_NR,
+	},
+	{
+		.brdinfo = &nvsw_sn2201_static_devices[8],
+		.nr = NVSW_SN2201_MAIN_MUX_CH6_NR,
+	},
+	{
+		.brdinfo = &nvsw_sn2201_static_devices[9],
+		.nr = NVSW_SN2201_MAIN_MUX_CH6_NR,
+	},
+	{
+		.brdinfo = &nvsw_sn2201_static_devices[10],
+		.nr = NVSW_SN2201_MAIN_MUX_CH7_NR,
+	},
+	{
+		.brdinfo = &nvsw_sn2201_static_devices[11],
+		.nr = NVSW_SN2201_MAIN_MUX_CH1_NR,
+	},
+};
+
 /* LED default data. */
 static struct mlxreg_core_data nvsw_sn2201_led_data[] = {
 	{
@@ -981,7 +1071,10 @@ static int nvsw_sn2201_config_init(struct nvsw_sn2201 *nvsw_sn2201, void *regmap
 	nvsw_sn2201->io_data = &nvsw_sn2201_regs_io;
 	nvsw_sn2201->led_data = &nvsw_sn2201_led;
 	nvsw_sn2201->wd_data = &nvsw_sn2201_wd;
-	nvsw_sn2201->hotplug_data = &nvsw_sn2201_hotplug;
+	if (nvsw_sn2201->ext_pwr_source)
+		nvsw_sn2201->hotplug_data = &nvsw_sn2201_busbar_hotplug;
+	else
+		nvsw_sn2201->hotplug_data = &nvsw_sn2201_hotplug;
 
 	/* Register IO access driver. */
 	if (nvsw_sn2201->io_data) {
@@ -1198,12 +1291,18 @@ static int nvsw_sn2201_config_pre_init(struct nvsw_sn2201 *nvsw_sn2201)
 static int nvsw_sn2201_probe(struct platform_device *pdev)
 {
 	struct nvsw_sn2201 *nvsw_sn2201;
+	const char *sku;
 	int ret;
 
 	nvsw_sn2201 = devm_kzalloc(&pdev->dev, sizeof(*nvsw_sn2201), GFP_KERNEL);
 	if (!nvsw_sn2201)
 		return -ENOMEM;
 
+	/* Validate system powering type - only HI168 SKU supports external power. */
+	sku = dmi_get_system_info(DMI_PRODUCT_SKU);
+	if (sku && !strcmp(sku, "HI168"))
+		nvsw_sn2201->ext_pwr_source = true;
+
 	nvsw_sn2201->dev = &pdev->dev;
 	platform_set_drvdata(pdev, nvsw_sn2201);
 	ret = platform_device_add_resources(pdev, nvsw_sn2201_lpc_io_resources,
@@ -1214,8 +1313,13 @@ static int nvsw_sn2201_probe(struct platform_device *pdev)
 	nvsw_sn2201->main_mux_deferred_nr = NVSW_SN2201_MAIN_MUX_DEFER_NR;
 	nvsw_sn2201->main_mux_devs = nvsw_sn2201_main_mux_brdinfo;
 	nvsw_sn2201->cpld_devs = nvsw_sn2201_cpld_brdinfo;
-	nvsw_sn2201->sn2201_devs = nvsw_sn2201_static_brdinfo;
-	nvsw_sn2201->sn2201_devs_num = ARRAY_SIZE(nvsw_sn2201_static_brdinfo);
+	if (nvsw_sn2201->ext_pwr_source) {
+		nvsw_sn2201->sn2201_devs = nvsw_sn2201_busbar_static_brdinfo;
+		nvsw_sn2201->sn2201_devs_num = ARRAY_SIZE(nvsw_sn2201_busbar_static_brdinfo);
+	} else {
+		nvsw_sn2201->sn2201_devs = nvsw_sn2201_static_brdinfo;
+		nvsw_sn2201->sn2201_devs_num = ARRAY_SIZE(nvsw_sn2201_static_brdinfo);
+	}
 
 	return nvsw_sn2201_config_pre_init(nvsw_sn2201);
 }