mtd: pxa3xx_nand: enable multiple chip select support

Current pxa3xx_nand controller has two chip select which
both be workable. This patch enable this feature.

Update platform driver to support this feature.

Another notice should be taken that:
When you want to use this feature, you should not enable the
keep configuration feature, for two chip select could be
attached with different nand chip. The different page size
and timing requirement make the keep configuration impossible.

Signed-off-by: Lei Wen <leiwen@marvell.com>

1 files changed, 18 insertions, 2 deletions

diff --git a/arch/arm/plat-pxa/include/plat/pxa3xx_nand.h b/arch/arm/plat-pxa/include/plat/pxa3xx_nand.h
index 442301fe48b..c42f39f2019 100644
--- a/arch/arm/plat-pxa/include/plat/pxa3xx_nand.h
+++ b/arch/arm/plat-pxa/include/plat/pxa3xx_nand.h
@@ -41,6 +41,19 @@ struct pxa3xx_nand_flash {
 	struct pxa3xx_nand_timing *timing;	/* NAND Flash timing */
 };
 
+/*
+ * Current pxa3xx_nand controller has two chip select which
+ * both be workable.
+ *
+ * Notice should be taken that:
+ * When you want to use this feature, you should not enable the
+ * keep configuration feature, for two chip select could be
+ * attached with different nand chip. The different page size
+ * and timing requirement make the keep configuration impossible.
+ */
+
+/* The max num of chip select current support */
+#define NUM_CHIP_SELECT		(2)
 struct pxa3xx_nand_platform_data {
 
 	/* the data flash bus is shared between the Static Memory
@@ -52,8 +65,11 @@ struct pxa3xx_nand_platform_data {
 	/* allow platform code to keep OBM/bootloader defined NFC config */
 	int	keep_config;
 
-	const struct mtd_partition		*parts;
-	unsigned int				nr_parts;
+	/* indicate how many chip selects will be used */
+	int	num_cs;
+
+	const struct mtd_partition		*parts[NUM_CHIP_SELECT];
+	unsigned int				nr_parts[NUM_CHIP_SELECT];
 
 	const struct pxa3xx_nand_flash * 	flash;
 	size_t					num_flash;