Johnson, a former USC standout and
Whitmore provided the details after Johnson's publicist confirmed that the football player was a witness in the case.
When Johnson arrived at Bieber's home, he reached out his arm to prevent the garage door from closing and confronted Bieber, who was in the driver's seat, according to police reports.
"He was concerned about his daughter and he wanted to talk to Mr. Bieber about that," Whitmore said. "Mr. Bieber hurried into the home without talking to anybody."
A source told The Times that as Bieber went inside, someone threatened to call authorities on Johnson, to which Johnson agreed, "Call the cops."
A second witness who was taking his trash out also saw Bieber in the driver's seat, Whitmore said.
Bieber's team has denied that the singer was speeding through the neighborhood and was behind the wheel only as he backed the Ferrari into the garage, said a source familiar with the investigation.
L.A. County sheriff's officials said they were investigating the incident and will present the case to the the Los Angeles County district attorney's office for a possible criminal filing. Bieber refused to talk with sheriff's deputies who were called to the scene, Whitmore said.
Bieber isn't making any friends in his neighborhood.
Prosecutors are already weighing whether to charge Bieber for battery for allegedly spitting on a neighbor in March after the neighbor complained about the singer and his entourage speeding through the neighborhood.
In November, Bieber was cited by police in West Hollywood for making an unsafe turn.
NFL Hall of Famer Eric Dickerson -- also a Calabasas resident -- took to Twitter on Tuesday to chastise Bieber.
"Hey @justinbieber I use to have a white Ferrari too, but I knew the speed limit in neighborhoods where kids played," Dickerson tweeted.
He also tweeted: "I live in Calabasas too and @justinbieber needs to slow his ass down."