[PATCH v3 04/12] mtd: rawnand: introduce struct onfi_helper

[PATCH v3 04/12] mtd: rawnand: introduce struct onfi_helper

[Shivamurthy Shastri (sshivamurthy)]

Create onfi_helper object. This is base to turn ONFI code to generic.

Signed-off-by: Shivamurthy Shastri <sshivamurthy@micron.com>
---
 include/linux/mtd/nand.h | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 3cdf06cae8b6..645dde4c5797 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -11,6 +11,7 @@
 #define __LINUX_MTD_NAND_H
 
 #include <linux/mtd/mtd.h>
+#include <linux/mtd/onfi.h>
 
 /**
  * struct nand_memory_organization - Memory organization structure
@@ -157,6 +158,24 @@ struct nand_ops {
 	bool (*isbad)(struct nand_device *nand, const struct nand_pos *pos);
 };
 
+/**
+ * struct onfi_helper - ONFI helper functions that should be implemented by
+ * specialized layers (raw NAND, SPI NAND, etc.)
+ * @page: Page number for ONFI parameter table
+ * @check_revision: Check ONFI revision number
+ * @parameter_page_read: Function to read parameter pages
+ * @init_intf_data: Initialize interface specific data or fixups
+ */
+struct onfi_helper {
+	u8 page;
+	int (*check_revision)(struct nand_device *base,
+			      struct nand_onfi_params *p, int *onfi_version);
+	int (*parameter_page_read)(struct nand_device *base, u8 page,
+				   void *buf, unsigned int len);
+	int (*init_intf_data)(struct nand_device *base,
+			      struct nand_onfi_params *p);
+};
+
 /**
  * struct nand_device - NAND device
  * @mtd: MTD instance attached to the NAND device
@@ -165,6 +184,7 @@ struct nand_ops {
  * @rowconv: position to row address converter
  * @bbt: bad block table info
  * @ops: NAND operations attached to the NAND device
+ * @helper: Helper functions to detect and initialize ONFI NAND
  *
  * Generic NAND object. Specialized NAND layers (raw NAND, SPI NAND, OneNAND)
  * should declare their own NAND object embedding a nand_device struct (that's
@@ -183,6 +203,7 @@ struct nand_device {
 	struct nand_row_converter rowconv;
 	struct nand_bbt bbt;
 	const struct nand_ops *ops;
+	struct onfi_helper helper;
 };
 
 /**
-- 
2.17.1

[PATCH v3 04/12] mtd: rawnand: introduce struct onfi_helper

[Shivamurthy Shastri (sshivamurthy)]

Create onfi_helper object. This is base to turn ONFI code to generic.

Signed-off-by: Shivamurthy Shastri <sshivamurthy@micron.com>
---
 include/linux/mtd/nand.h | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 3cdf06cae8b6..645dde4c5797 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -11,6 +11,7 @@
 #define __LINUX_MTD_NAND_H
 
 #include <linux/mtd/mtd.h>
+#include <linux/mtd/onfi.h>
 
 /**
  * struct nand_memory_organization - Memory organization structure
@@ -157,6 +158,24 @@ struct nand_ops {
 	bool (*isbad)(struct nand_device *nand, const struct nand_pos *pos);
 };
 
+/**
+ * struct onfi_helper - ONFI helper functions that should be implemented by
+ * specialized layers (raw NAND, SPI NAND, etc.)
+ * @page: Page number for ONFI parameter table
+ * @check_revision: Check ONFI revision number
+ * @parameter_page_read: Function to read parameter pages
+ * @init_intf_data: Initialize interface specific data or fixups
+ */
+struct onfi_helper {
+	u8 page;
+	int (*check_revision)(struct nand_device *base,
+			      struct nand_onfi_params *p, int *onfi_version);
+	int (*parameter_page_read)(struct nand_device *base, u8 page,
+				   void *buf, unsigned int len);
+	int (*init_intf_data)(struct nand_device *base,
+			      struct nand_onfi_params *p);
+};
+
 /**
  * struct nand_device - NAND device
  * @mtd: MTD instance attached to the NAND device
@@ -165,6 +184,7 @@ struct nand_ops {
  * @rowconv: position to row address converter
  * @bbt: bad block table info
  * @ops: NAND operations attached to the NAND device
+ * @helper: Helper functions to detect and initialize ONFI NAND
  *
  * Generic NAND object. Specialized NAND layers (raw NAND, SPI NAND, OneNAND)
  * should declare their own NAND object embedding a nand_device struct (that's
@@ -183,6 +203,7 @@ struct nand_device {
 	struct nand_row_converter rowconv;
 	struct nand_bbt bbt;
 	const struct nand_ops *ops;
+	struct onfi_helper helper;
 };
 
 /**
-- 
2.17.1


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Re: [PATCH v3 04/12] mtd: rawnand: introduce struct onfi_helper

[Boris Brezillon]

Hi Shivamurthy,

On Mon, 3 Jun 2019 12:43:28 +0000
"Shivamurthy Shastri (sshivamurthy)" <sshivamurthy@micron.com> wrote:

> Create onfi_helper object. This is base to turn ONFI code to generic.
> 
> Signed-off-by: Shivamurthy Shastri <sshivamurthy@micron.com>
> ---
>  include/linux/mtd/nand.h | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
> 
> diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
> index 3cdf06cae8b6..645dde4c5797 100644
> --- a/include/linux/mtd/nand.h
> +++ b/include/linux/mtd/nand.h
> @@ -11,6 +11,7 @@
>  #define __LINUX_MTD_NAND_H
>  
>  #include <linux/mtd/mtd.h>
> +#include <linux/mtd/onfi.h>
>  
>  /**
>   * struct nand_memory_organization - Memory organization structure
> @@ -157,6 +158,24 @@ struct nand_ops {
>  	bool (*isbad)(struct nand_device *nand, const struct nand_pos *pos);
>  };
>  
> +/**
> + * struct onfi_helper - ONFI helper functions that should be implemented by
> + * specialized layers (raw NAND, SPI NAND, etc.)
> + * @page: Page number for ONFI parameter table
> + * @check_revision: Check ONFI revision number
> + * @parameter_page_read: Function to read parameter pages
> + * @init_intf_data: Initialize interface specific data or fixups
> + */
> +struct onfi_helper {
> +	u8 page;
> +	int (*check_revision)(struct nand_device *base,
> +			      struct nand_onfi_params *p, int *onfi_version);
> +	int (*parameter_page_read)(struct nand_device *base, u8 page,
> +				   void *buf, unsigned int len);
> +	int (*init_intf_data)(struct nand_device *base,
> +			      struct nand_onfi_params *p);
> +};
> +
>  /**
>   * struct nand_device - NAND device
>   * @mtd: MTD instance attached to the NAND device
> @@ -165,6 +184,7 @@ struct nand_ops {
>   * @rowconv: position to row address converter
>   * @bbt: bad block table info
>   * @ops: NAND operations attached to the NAND device
> + * @helper: Helper functions to detect and initialize ONFI NAND
>   *
>   * Generic NAND object. Specialized NAND layers (raw NAND, SPI NAND, OneNAND)
>   * should declare their own NAND object embedding a nand_device struct (that's
> @@ -183,6 +203,7 @@ struct nand_device {
>  	struct nand_row_converter rowconv;
>  	struct nand_bbt bbt;
>  	const struct nand_ops *ops;
> +	struct onfi_helper helper;

Sorry, but I don't think that's the right solution. When I said we
should have ONFI code shared I was thinking about the code that parses
the ONFI struct/data to extract nand_memory_organization bits or other
generic info, not something that would abstract how to retrieve the
ONFI param page. Clearly, the generic NAND layer is not supposed to
handle such protocol/low-level details.

Regards,

Boris

Re: [PATCH v3 04/12] mtd: rawnand: introduce struct onfi_helper

[Boris Brezillon]

Hi Shivamurthy,

On Mon, 3 Jun 2019 12:43:28 +0000
"Shivamurthy Shastri (sshivamurthy)" <sshivamurthy@micron.com> wrote:

> Create onfi_helper object. This is base to turn ONFI code to generic.
> 
> Signed-off-by: Shivamurthy Shastri <sshivamurthy@micron.com>
> ---
>  include/linux/mtd/nand.h | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
> 
> diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
> index 3cdf06cae8b6..645dde4c5797 100644
> --- a/include/linux/mtd/nand.h
> +++ b/include/linux/mtd/nand.h
> @@ -11,6 +11,7 @@
>  #define __LINUX_MTD_NAND_H
>  
>  #include <linux/mtd/mtd.h>
> +#include <linux/mtd/onfi.h>
>  
>  /**
>   * struct nand_memory_organization - Memory organization structure
> @@ -157,6 +158,24 @@ struct nand_ops {
>  	bool (*isbad)(struct nand_device *nand, const struct nand_pos *pos);
>  };
>  
> +/**
> + * struct onfi_helper - ONFI helper functions that should be implemented by
> + * specialized layers (raw NAND, SPI NAND, etc.)
> + * @page: Page number for ONFI parameter table
> + * @check_revision: Check ONFI revision number
> + * @parameter_page_read: Function to read parameter pages
> + * @init_intf_data: Initialize interface specific data or fixups
> + */
> +struct onfi_helper {
> +	u8 page;
> +	int (*check_revision)(struct nand_device *base,
> +			      struct nand_onfi_params *p, int *onfi_version);
> +	int (*parameter_page_read)(struct nand_device *base, u8 page,
> +				   void *buf, unsigned int len);
> +	int (*init_intf_data)(struct nand_device *base,
> +			      struct nand_onfi_params *p);
> +};
> +
>  /**
>   * struct nand_device - NAND device
>   * @mtd: MTD instance attached to the NAND device
> @@ -165,6 +184,7 @@ struct nand_ops {
>   * @rowconv: position to row address converter
>   * @bbt: bad block table info
>   * @ops: NAND operations attached to the NAND device
> + * @helper: Helper functions to detect and initialize ONFI NAND
>   *
>   * Generic NAND object. Specialized NAND layers (raw NAND, SPI NAND, OneNAND)
>   * should declare their own NAND object embedding a nand_device struct (that's
> @@ -183,6 +203,7 @@ struct nand_device {
>  	struct nand_row_converter rowconv;
>  	struct nand_bbt bbt;
>  	const struct nand_ops *ops;
> +	struct onfi_helper helper;

Sorry, but I don't think that's the right solution. When I said we
should have ONFI code shared I was thinking about the code that parses
the ONFI struct/data to extract nand_memory_organization bits or other
generic info, not something that would abstract how to retrieve the
ONFI param page. Clearly, the generic NAND layer is not supposed to
handle such protocol/low-level details.

Regards,

Boris

______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

RE: [EXT] Re: [PATCH v3 04/12] mtd: rawnand: introduce struct onfi_helper

[Shivamurthy Shastri (sshivamurthy)]

Hi Boris,

> > Create onfi_helper object. This is base to turn ONFI code to generic.
> >
> > Signed-off-by: Shivamurthy Shastri <sshivamurthy@micron.com>
> > ---
> >  include/linux/mtd/nand.h | 21 +++++++++++++++++++++
> >  1 file changed, 21 insertions(+)
> >
> > diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
> > index 3cdf06cae8b6..645dde4c5797 100644
> > --- a/include/linux/mtd/nand.h
> > +++ b/include/linux/mtd/nand.h
> > @@ -11,6 +11,7 @@
> >  #define __LINUX_MTD_NAND_H
> >
> >  #include <linux/mtd/mtd.h>
> > +#include <linux/mtd/onfi.h>
> >
> >  /**
> >   * struct nand_memory_organization - Memory organization structure
> > @@ -157,6 +158,24 @@ struct nand_ops {
> >  	bool (*isbad)(struct nand_device *nand, const struct nand_pos
> *pos);
> >  };
> >
> > +/**
> > + * struct onfi_helper - ONFI helper functions that should be implemented
> by
> > + * specialized layers (raw NAND, SPI NAND, etc.)
> > + * @page: Page number for ONFI parameter table
> > + * @check_revision: Check ONFI revision number
> > + * @parameter_page_read: Function to read parameter pages
> > + * @init_intf_data: Initialize interface specific data or fixups
> > + */
> > +struct onfi_helper {
> > +	u8 page;
> > +	int (*check_revision)(struct nand_device *base,
> > +			      struct nand_onfi_params *p, int *onfi_version);
> > +	int (*parameter_page_read)(struct nand_device *base, u8 page,
> > +				   void *buf, unsigned int len);
> > +	int (*init_intf_data)(struct nand_device *base,
> > +			      struct nand_onfi_params *p);
> > +};
> > +
> >  /**
> >   * struct nand_device - NAND device
> >   * @mtd: MTD instance attached to the NAND device
> > @@ -165,6 +184,7 @@ struct nand_ops {
> >   * @rowconv: position to row address converter
> >   * @bbt: bad block table info
> >   * @ops: NAND operations attached to the NAND device
> > + * @helper: Helper functions to detect and initialize ONFI NAND
> >   *
> >   * Generic NAND object. Specialized NAND layers (raw NAND, SPI NAND,
> OneNAND)
> >   * should declare their own NAND object embedding a nand_device struct
> (that's
> > @@ -183,6 +203,7 @@ struct nand_device {
> >  	struct nand_row_converter rowconv;
> >  	struct nand_bbt bbt;
> >  	const struct nand_ops *ops;
> > +	struct onfi_helper helper;
> 
> Sorry, but I don't think that's the right solution. When I said we
> should have ONFI code shared I was thinking about the code that parses
> the ONFI struct/data to extract nand_memory_organization bits or other
> generic info, not something that would abstract how to retrieve the
> ONFI param page. Clearly, the generic NAND layer is not supposed to
> handle such protocol/low-level details.
> 

In that case, I am thinking to design as follows, which splits into generic independent code.
Let me know, if you have any concerns or inputs.

I will parsing code from nand_onfi_detect function and move it to mtd/nand/onfi.c.
Also, I will move functions like sanitize_string, nand_bit_wise_majority, onfi_crc16, and 
any other generic info to mtd/nand/onfi.c.

Thanks,
Shiva

RE: [EXT] Re: [PATCH v3 04/12] mtd: rawnand: introduce struct onfi_helper

[Shivamurthy Shastri (sshivamurthy)]

Hi Boris,

> > Create onfi_helper object. This is base to turn ONFI code to generic.
> >
> > Signed-off-by: Shivamurthy Shastri <sshivamurthy@micron.com>
> > ---
> >  include/linux/mtd/nand.h | 21 +++++++++++++++++++++
> >  1 file changed, 21 insertions(+)
> >
> > diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
> > index 3cdf06cae8b6..645dde4c5797 100644
> > --- a/include/linux/mtd/nand.h
> > +++ b/include/linux/mtd/nand.h
> > @@ -11,6 +11,7 @@
> >  #define __LINUX_MTD_NAND_H
> >
> >  #include <linux/mtd/mtd.h>
> > +#include <linux/mtd/onfi.h>
> >
> >  /**
> >   * struct nand_memory_organization - Memory organization structure
> > @@ -157,6 +158,24 @@ struct nand_ops {
> >  	bool (*isbad)(struct nand_device *nand, const struct nand_pos
> *pos);
> >  };
> >
> > +/**
> > + * struct onfi_helper - ONFI helper functions that should be implemented
> by
> > + * specialized layers (raw NAND, SPI NAND, etc.)
> > + * @page: Page number for ONFI parameter table
> > + * @check_revision: Check ONFI revision number
> > + * @parameter_page_read: Function to read parameter pages
> > + * @init_intf_data: Initialize interface specific data or fixups
> > + */
> > +struct onfi_helper {
> > +	u8 page;
> > +	int (*check_revision)(struct nand_device *base,
> > +			      struct nand_onfi_params *p, int *onfi_version);
> > +	int (*parameter_page_read)(struct nand_device *base, u8 page,
> > +				   void *buf, unsigned int len);
> > +	int (*init_intf_data)(struct nand_device *base,
> > +			      struct nand_onfi_params *p);
> > +};
> > +
> >  /**
> >   * struct nand_device - NAND device
> >   * @mtd: MTD instance attached to the NAND device
> > @@ -165,6 +184,7 @@ struct nand_ops {
> >   * @rowconv: position to row address converter
> >   * @bbt: bad block table info
> >   * @ops: NAND operations attached to the NAND device
> > + * @helper: Helper functions to detect and initialize ONFI NAND
> >   *
> >   * Generic NAND object. Specialized NAND layers (raw NAND, SPI NAND,
> OneNAND)
> >   * should declare their own NAND object embedding a nand_device struct
> (that's
> > @@ -183,6 +203,7 @@ struct nand_device {
> >  	struct nand_row_converter rowconv;
> >  	struct nand_bbt bbt;
> >  	const struct nand_ops *ops;
> > +	struct onfi_helper helper;
> 
> Sorry, but I don't think that's the right solution. When I said we
> should have ONFI code shared I was thinking about the code that parses
> the ONFI struct/data to extract nand_memory_organization bits or other
> generic info, not something that would abstract how to retrieve the
> ONFI param page. Clearly, the generic NAND layer is not supposed to
> handle such protocol/low-level details.
> 

In that case, I am thinking to design as follows, which splits into generic independent code.
Let me know, if you have any concerns or inputs.

I will parsing code from nand_onfi_detect function and move it to mtd/nand/onfi.c.
Also, I will move functions like sanitize_string, nand_bit_wise_majority, onfi_crc16, and 
any other generic info to mtd/nand/onfi.c.

Thanks,
Shiva

______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

Re: [EXT] Re: [PATCH v3 04/12] mtd: rawnand: introduce struct onfi_helper

[Boris Brezillon]

On Tue, 4 Jun 2019 12:02:28 +0000
"Shivamurthy Shastri (sshivamurthy)" <sshivamurthy@micron.com> wrote:

> Hi Boris,
> 
> > > Create onfi_helper object. This is base to turn ONFI code to generic.
> > >
> > > Signed-off-by: Shivamurthy Shastri <sshivamurthy@micron.com>
> > > ---
> > >  include/linux/mtd/nand.h | 21 +++++++++++++++++++++
> > >  1 file changed, 21 insertions(+)
> > >
> > > diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
> > > index 3cdf06cae8b6..645dde4c5797 100644
> > > --- a/include/linux/mtd/nand.h
> > > +++ b/include/linux/mtd/nand.h
> > > @@ -11,6 +11,7 @@
> > >  #define __LINUX_MTD_NAND_H
> > >
> > >  #include <linux/mtd/mtd.h>
> > > +#include <linux/mtd/onfi.h>
> > >
> > >  /**
> > >   * struct nand_memory_organization - Memory organization structure
> > > @@ -157,6 +158,24 @@ struct nand_ops {
> > >  	bool (*isbad)(struct nand_device *nand, const struct nand_pos  
> > *pos);  
> > >  };
> > >
> > > +/**
> > > + * struct onfi_helper - ONFI helper functions that should be implemented  
> > by  
> > > + * specialized layers (raw NAND, SPI NAND, etc.)
> > > + * @page: Page number for ONFI parameter table
> > > + * @check_revision: Check ONFI revision number
> > > + * @parameter_page_read: Function to read parameter pages
> > > + * @init_intf_data: Initialize interface specific data or fixups
> > > + */
> > > +struct onfi_helper {
> > > +	u8 page;
> > > +	int (*check_revision)(struct nand_device *base,
> > > +			      struct nand_onfi_params *p, int *onfi_version);
> > > +	int (*parameter_page_read)(struct nand_device *base, u8 page,
> > > +				   void *buf, unsigned int len);
> > > +	int (*init_intf_data)(struct nand_device *base,
> > > +			      struct nand_onfi_params *p);
> > > +};
> > > +
> > >  /**
> > >   * struct nand_device - NAND device
> > >   * @mtd: MTD instance attached to the NAND device
> > > @@ -165,6 +184,7 @@ struct nand_ops {
> > >   * @rowconv: position to row address converter
> > >   * @bbt: bad block table info
> > >   * @ops: NAND operations attached to the NAND device
> > > + * @helper: Helper functions to detect and initialize ONFI NAND
> > >   *
> > >   * Generic NAND object. Specialized NAND layers (raw NAND, SPI NAND,  
> > OneNAND)  
> > >   * should declare their own NAND object embedding a nand_device struct  
> > (that's  
> > > @@ -183,6 +203,7 @@ struct nand_device {
> > >  	struct nand_row_converter rowconv;
> > >  	struct nand_bbt bbt;
> > >  	const struct nand_ops *ops;
> > > +	struct onfi_helper helper;  
> > 
> > Sorry, but I don't think that's the right solution. When I said we
> > should have ONFI code shared I was thinking about the code that parses
> > the ONFI struct/data to extract nand_memory_organization bits or other
> > generic info, not something that would abstract how to retrieve the
> > ONFI param page. Clearly, the generic NAND layer is not supposed to
> > handle such protocol/low-level details.
> >   
> 
> In that case, I am thinking to design as follows, which splits into generic independent code.
> Let me know, if you have any concerns or inputs.
> 
> I will parsing code from nand_onfi_detect function and move it to mtd/nand/onfi.c.
> Also, I will move functions like sanitize_string, nand_bit_wise_majority, onfi_crc16, and 
> any other generic info to mtd/nand/onfi.c.

Sounds good.

Re: [EXT] Re: [PATCH v3 04/12] mtd: rawnand: introduce struct onfi_helper

[Boris Brezillon]

On Tue, 4 Jun 2019 12:02:28 +0000
"Shivamurthy Shastri (sshivamurthy)" <sshivamurthy@micron.com> wrote:

> Hi Boris,
> 
> > > Create onfi_helper object. This is base to turn ONFI code to generic.
> > >
> > > Signed-off-by: Shivamurthy Shastri <sshivamurthy@micron.com>
> > > ---
> > >  include/linux/mtd/nand.h | 21 +++++++++++++++++++++
> > >  1 file changed, 21 insertions(+)
> > >
> > > diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
> > > index 3cdf06cae8b6..645dde4c5797 100644
> > > --- a/include/linux/mtd/nand.h
> > > +++ b/include/linux/mtd/nand.h
> > > @@ -11,6 +11,7 @@
> > >  #define __LINUX_MTD_NAND_H
> > >
> > >  #include <linux/mtd/mtd.h>
> > > +#include <linux/mtd/onfi.h>
> > >
> > >  /**
> > >   * struct nand_memory_organization - Memory organization structure
> > > @@ -157,6 +158,24 @@ struct nand_ops {
> > >  	bool (*isbad)(struct nand_device *nand, const struct nand_pos  
> > *pos);  
> > >  };
> > >
> > > +/**
> > > + * struct onfi_helper - ONFI helper functions that should be implemented  
> > by  
> > > + * specialized layers (raw NAND, SPI NAND, etc.)
> > > + * @page: Page number for ONFI parameter table
> > > + * @check_revision: Check ONFI revision number
> > > + * @parameter_page_read: Function to read parameter pages
> > > + * @init_intf_data: Initialize interface specific data or fixups
> > > + */
> > > +struct onfi_helper {
> > > +	u8 page;
> > > +	int (*check_revision)(struct nand_device *base,
> > > +			      struct nand_onfi_params *p, int *onfi_version);
> > > +	int (*parameter_page_read)(struct nand_device *base, u8 page,
> > > +				   void *buf, unsigned int len);
> > > +	int (*init_intf_data)(struct nand_device *base,
> > > +			      struct nand_onfi_params *p);
> > > +};
> > > +
> > >  /**
> > >   * struct nand_device - NAND device
> > >   * @mtd: MTD instance attached to the NAND device
> > > @@ -165,6 +184,7 @@ struct nand_ops {
> > >   * @rowconv: position to row address converter
> > >   * @bbt: bad block table info
> > >   * @ops: NAND operations attached to the NAND device
> > > + * @helper: Helper functions to detect and initialize ONFI NAND
> > >   *
> > >   * Generic NAND object. Specialized NAND layers (raw NAND, SPI NAND,  
> > OneNAND)  
> > >   * should declare their own NAND object embedding a nand_device struct  
> > (that's  
> > > @@ -183,6 +203,7 @@ struct nand_device {
> > >  	struct nand_row_converter rowconv;
> > >  	struct nand_bbt bbt;
> > >  	const struct nand_ops *ops;
> > > +	struct onfi_helper helper;  
> > 
> > Sorry, but I don't think that's the right solution. When I said we
> > should have ONFI code shared I was thinking about the code that parses
> > the ONFI struct/data to extract nand_memory_organization bits or other
> > generic info, not something that would abstract how to retrieve the
> > ONFI param page. Clearly, the generic NAND layer is not supposed to
> > handle such protocol/low-level details.
> >   
> 
> In that case, I am thinking to design as follows, which splits into generic independent code.
> Let me know, if you have any concerns or inputs.
> 
> I will parsing code from nand_onfi_detect function and move it to mtd/nand/onfi.c.
> Also, I will move functions like sanitize_string, nand_bit_wise_majority, onfi_crc16, and 
> any other generic info to mtd/nand/onfi.c.

Sounds good.

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