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Only use the TROCR register on R-Car Gen3 as it is not present on other SoCs. Offsets used for the undocumented registers are considered reserved and should not be written to. After some internal investigation with Renesas it remains unclear why this driver accesses these fields on R-Car Gen2 but regardless of what the historical reasons are the current code is considered incorrect. Signed-off-by: Simon Horman <horms+renesas@verge.net.au> Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Acked-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> Signed-off-by: David S. Miller <davem@davemloft.net>