Hi Laurent,
information for data lane shifter is passed through platform data:

/**
 * struct isp_parallel_platform_data - Parallel interface platform data
 * @data_lane_shift: Data lane shifter
 *              0 - CAMEXT[13:0] -> CAM[13:0]
 *              1 - CAMEXT[13:2] -> CAM[11:0]
 *              2 - CAMEXT[13:4] -> CAM[9:0]
 *              3 - CAMEXT[13:6] -> CAM[7:0]
 * @clk_pol: Pixel clock polarity
 *              0 - Non Inverted, 1 - Inverted
 * @bridge: CCDC Bridge input control
 *              ISPCTRL_PAR_BRIDGE_DISABLE - Disable
 *              ISPCTRL_PAR_BRIDGE_LENDIAN - Little endian
 *              ISPCTRL_PAR_BRIDGE_BENDIAN - Big endian
 */
struct isp_parallel_platform_data {
        unsigned int data_lane_shift:2;
        unsigned int clk_pol:1;
        unsigned int bridge:4;
};

This way I am able to convert from 12bpp to 8bpp:
data_lane_shift = 2  and  bridge = ISPCTRL_PAR_BRIDGE_DISABLE

-- 
Javier Martin
Vista Silicon S.L.
CDTUC - FASE C - Oficina S-345
Avda de los Castros s/n
39005- Santander. Cantabria. Spain
+34 942 25 32 60
www.vista-silicon.com
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