const enum omap_display_type *ports;
        int num_ports;
        const struct dss_ops *ops;
+       struct dss_reg_field dispc_clk_switch;
 };
 
 static struct {
 static void dss_select_dispc_clk_source(enum dss_clk_source clk_src)
 {
        int b;
-       u8 start, end;
 
        /*
         * We always use PRCM clock as the DISPC func clock, except on DSS3,
                return;
        }
 
-       dss_feat_get_reg_field(FEAT_REG_DISPC_CLK_SWITCH, &start, &end);
-
-       REG_FLD_MOD(DSS_CONTROL, b, start, end);        /* DISPC_CLK_SWITCH */
+       REG_FLD_MOD(DSS_CONTROL, b,                     /* DISPC_CLK_SWITCH */
+                   dss.feat->dispc_clk_switch.start,
+                   dss.feat->dispc_clk_switch.end);
 
        dss.dispc_clk_source = clk_src;
 }
        .ports                  =       omap2plus_ports,
        .num_ports              =       ARRAY_SIZE(omap2plus_ports),
        .ops                    =       &dss_ops_omap2_omap3,
+       .dispc_clk_switch       =       { 0, 0 },
 };
 
 static const struct dss_features omap34xx_dss_feats = {
        .ports                  =       omap34xx_ports,
        .num_ports              =       ARRAY_SIZE(omap34xx_ports),
        .ops                    =       &dss_ops_omap2_omap3,
+       .dispc_clk_switch       =       { 0, 0 },
 };
 
 static const struct dss_features omap3630_dss_feats = {
        .ports                  =       omap2plus_ports,
        .num_ports              =       ARRAY_SIZE(omap2plus_ports),
        .ops                    =       &dss_ops_omap2_omap3,
+       .dispc_clk_switch       =       { 0, 0 },
 };
 
 static const struct dss_features omap44xx_dss_feats = {
        .ports                  =       omap2plus_ports,
        .num_ports              =       ARRAY_SIZE(omap2plus_ports),
        .ops                    =       &dss_ops_omap4,
+       .dispc_clk_switch       =       { 9, 8 },
 };
 
 static const struct dss_features omap54xx_dss_feats = {
        .ports                  =       omap2plus_ports,
        .num_ports              =       ARRAY_SIZE(omap2plus_ports),
        .ops                    =       &dss_ops_omap5,
+       .dispc_clk_switch       =       { 9, 7 },
 };
 
 static const struct dss_features am43xx_dss_feats = {
        .ports                  =       omap2plus_ports,
        .num_ports              =       ARRAY_SIZE(omap2plus_ports),
        .ops                    =       &dss_ops_omap2_omap3,
+       .dispc_clk_switch       =       { 0, 0 },
 };
 
 static const struct dss_features dra7xx_dss_feats = {
        .ports                  =       dra7xx_ports,
        .num_ports              =       ARRAY_SIZE(dra7xx_ports),
        .ops                    =       &dss_ops_dra7,
+       .dispc_clk_switch       =       { 9, 7 },
 };
 
 static int dss_init_ports(struct platform_device *pdev)
 
 #include "dss.h"
 #include "dss_features.h"
 
-/* Defines a generic omap register field */
-struct dss_reg_field {
-       u8 start, end;
-};
-
 struct dss_param_range {
        int min, max;
 };
        [FEAT_REG_FIFOSIZE]                     = { 8, 0 },
        [FEAT_REG_HORIZONTALACCU]               = { 9, 0 },
        [FEAT_REG_VERTICALACCU]                 = { 25, 16 },
-       [FEAT_REG_DISPC_CLK_SWITCH]             = { 0, 0 },
 };
 
 static const struct dss_reg_field omap3_dss_reg_fields[] = {
        [FEAT_REG_FIFOSIZE]                     = { 10, 0 },
        [FEAT_REG_HORIZONTALACCU]               = { 9, 0 },
        [FEAT_REG_VERTICALACCU]                 = { 25, 16 },
-       [FEAT_REG_DISPC_CLK_SWITCH]             = { 0, 0 },
 };
 
 static const struct dss_reg_field am43xx_dss_reg_fields[] = {
        [FEAT_REG_FIFOSIZE]             = { 10, 0 },
        [FEAT_REG_HORIZONTALACCU]               = { 9, 0 },
        [FEAT_REG_VERTICALACCU]                 = { 25, 16 },
-       [FEAT_REG_DISPC_CLK_SWITCH]             = { 0, 0 },
 };
 
 static const struct dss_reg_field omap4_dss_reg_fields[] = {
        [FEAT_REG_FIFOSIZE]                     = { 15, 0 },
        [FEAT_REG_HORIZONTALACCU]               = { 10, 0 },
        [FEAT_REG_VERTICALACCU]                 = { 26, 16 },
-       [FEAT_REG_DISPC_CLK_SWITCH]             = { 9, 8 },
 };
 
 static const struct dss_reg_field omap5_dss_reg_fields[] = {
        [FEAT_REG_FIFOSIZE]                     = { 15, 0 },
        [FEAT_REG_HORIZONTALACCU]               = { 10, 0 },
        [FEAT_REG_VERTICALACCU]                 = { 26, 16 },
-       [FEAT_REG_DISPC_CLK_SWITCH]             = { 9, 7 },
 };
 
 static const enum omap_dss_output_id omap2_dss_supported_outputs[] = {