[PATCH 10/12] mtd: rawnand: stm32_fmc2: add a platform data structure

[Christophe Kerello <christophe.kerello@xxxxxxxxxxx>]

Before the introduction of MP25 SOC, let's use a platform data
structure for parameters that will differ (number of chip select).

The FMC2 NAND can support up to 4 chips select. On MP1 SOCs, only 2
chip select are available.

Signed-off-by: Christophe Kerello <christophe.kerello@xxxxxxxxxxx>
---
 drivers/mtd/nand/raw/stm32_fmc2_nand.c | 32 +++++++++++++++++++++-----
 1 file changed, 26 insertions(+), 6 deletions(-)

diff --git a/drivers/mtd/nand/raw/stm32_fmc2_nand.c b/drivers/mtd/nand/raw/stm32_fmc2_nand.c
index a7db7b675514..c5bdb43f7221 100644
--- a/drivers/mtd/nand/raw/stm32_fmc2_nand.c
+++ b/drivers/mtd/nand/raw/stm32_fmc2_nand.c
@@ -16,6 +16,7 @@
 #include <linux/module.h>
 #include <linux/mtd/rawnand.h>
 #include <linux/of_address.h>
+#include <linux/of_device.h>
 #include <linux/pinctrl/consumer.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
@@ -37,7 +38,7 @@
 #define FMC2_MAX_SG			16
 
 /* Max chip enable */
-#define FMC2_MAX_CE			2
+#define FMC2_MAX_CE			4
 
 /* Max ECC buffer length */
 #define FMC2_MAX_ECC_BUF_LEN		(FMC2_BCHDSRS_LEN * FMC2_MAX_SG)
@@ -243,6 +244,10 @@ static inline struct stm32_fmc2_nand *to_fmc2_nand(struct nand_chip *chip)
 	return container_of(chip, struct stm32_fmc2_nand, chip);
 }
 
+struct stm32_fmc2_nfc_data {
+	int max_ncs;
+};
+
 struct stm32_fmc2_nfc {
 	struct nand_controller base;
 	struct stm32_fmc2_nand nand;
@@ -256,6 +261,7 @@ struct stm32_fmc2_nfc {
 	phys_addr_t data_phys_addr[FMC2_MAX_CE];
 	struct clk *clk;
 	u8 irq_state;
+	const struct stm32_fmc2_nfc_data *data;
 
 	struct dma_chan *dma_tx_ch;
 	struct dma_chan *dma_rx_ch;
@@ -1809,7 +1815,7 @@ static int stm32_fmc2_nfc_parse_child(struct stm32_fmc2_nfc *nfc,
 			return ret;
 		}
 
-		if (cs >= FMC2_MAX_CE) {
+		if (cs >= nfc->data->max_ncs) {
 			dev_err(nfc->dev, "invalid reg value: %d\n", cs);
 			return -EINVAL;
 		}
@@ -1915,6 +1921,10 @@ static int stm32_fmc2_nfc_probe(struct platform_device *pdev)
 	nand_controller_init(&nfc->base);
 	nfc->base.ops = &stm32_fmc2_nfc_controller_ops;
 
+	nfc->data = of_device_get_match_data(dev);
+	if (!nfc->data)
+		return -EINVAL;
+
 	ret = stm32_fmc2_nfc_set_cdev(nfc);
 	if (ret)
 		return ret;
@@ -1936,7 +1946,7 @@ static int stm32_fmc2_nfc_probe(struct platform_device *pdev)
 	if (nfc->dev == nfc->cdev)
 		start_region = 1;
 
-	for (chip_cs = 0, mem_region = start_region; chip_cs < FMC2_MAX_CE;
+	for (chip_cs = 0, mem_region = start_region; chip_cs < nfc->data->max_ncs;
 	     chip_cs++, mem_region += 3) {
 		if (!(nfc->cs_assigned & BIT(chip_cs)))
 			continue;
@@ -2092,7 +2102,7 @@ static int __maybe_unused stm32_fmc2_nfc_resume(struct device *dev)
 
 	stm32_fmc2_nfc_wp_disable(nand);
 
-	for (chip_cs = 0; chip_cs < FMC2_MAX_CE; chip_cs++) {
+	for (chip_cs = 0; chip_cs < nfc->data->max_ncs; chip_cs++) {
 		if (!(nfc->cs_assigned & BIT(chip_cs)))
 			continue;
 
@@ -2105,9 +2115,19 @@ static int __maybe_unused stm32_fmc2_nfc_resume(struct device *dev)
 static SIMPLE_DEV_PM_OPS(stm32_fmc2_nfc_pm_ops, stm32_fmc2_nfc_suspend,
 			 stm32_fmc2_nfc_resume);
 
+static const struct stm32_fmc2_nfc_data stm32_fmc2_nfc_mp1_data = {
+	.max_ncs = 2,
+};
+
 static const struct of_device_id stm32_fmc2_nfc_match[] = {
-	{.compatible = "st,stm32mp15-fmc2"},
-	{.compatible = "st,stm32mp1-fmc2-nfc"},
+	{
+		.compatible = "st,stm32mp15-fmc2",
+		.data = &stm32_fmc2_nfc_mp1_data,
+	},
+	{
+		.compatible = "st,stm32mp1-fmc2-nfc",
+		.data = &stm32_fmc2_nfc_mp1_data,
+	},
 	{}
 };
 MODULE_DEVICE_TABLE(of, stm32_fmc2_nfc_match);
-- 
2.25.1