Rename the pad to sw_data as per description of this field in the hardware spec(refer sprugr9 from www.ti.com). Latest version of the document is at http://www.ti.com/lit/ug/sprugr9h/sprugr9h.pdf and section 3.1 Host Packet Descriptor describes this field.
Also define and use a constant for the size of sw_data field similar to other fields in the struct for desc and document the sw_data field in the header. As the sw_data is not touched by hw, it's type can be changed to u32. Cc: Wingman Kwok <w-kw...@ti.com> Cc: Mugunthan V N <mugunthan...@ti.com> CC: Arnd Bergmann <a...@arndb.de> CC: Grygorii Strashko <grygorii.stras...@ti.com> CC: David Laight <david.lai...@aculab.com> Signed-off-by: Murali Karicheri <m-kariche...@ti.com> --- new patch based on discussion at https://patchwork.ozlabs.org/patch/580860/ include/linux/soc/ti/knav_dma.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/include/linux/soc/ti/knav_dma.h b/include/linux/soc/ti/knav_dma.h index 343c13a..35cb926 100644 --- a/include/linux/soc/ti/knav_dma.h +++ b/include/linux/soc/ti/knav_dma.h @@ -44,6 +44,7 @@ #define KNAV_DMA_NUM_EPIB_WORDS 4 #define KNAV_DMA_NUM_PS_WORDS 16 +#define KNAV_DMA_NUM_SW_DATA_WORDS 4 #define KNAV_DMA_FDQ_PER_CHAN 4 /* Tx channel scheduling priority */ @@ -142,6 +143,7 @@ struct knav_dma_cfg { * @orig_buff: buff pointer since 'buff' can be overwritten * @epib: Extended packet info block * @psdata: Protocol specific + * @sw_data: Software private data not touched by h/w */ struct knav_dma_desc { __le32 desc_info; @@ -154,7 +156,7 @@ struct knav_dma_desc { __le32 orig_buff; __le32 epib[KNAV_DMA_NUM_EPIB_WORDS]; __le32 psdata[KNAV_DMA_NUM_PS_WORDS]; - __le32 pad[4]; + u32 sw_data[KNAV_DMA_NUM_SW_DATA_WORDS]; } ____cacheline_aligned; #if IS_ENABLED(CONFIG_KEYSTONE_NAVIGATOR_DMA) -- 1.9.1
