• Gerhard Sittig's avatar
    can: mscan: improve clock API use · 1149108e
    Gerhard Sittig authored
    the .get_clock() callback is run from probe() and might allocate
    resources, introduce a .put_clock() callback that is run from remove()
    to undo any allocation activities
    
    prepare and enable the clocks in open(), disable and unprepare the
    clocks in close() if clocks were acquired during probe(), to not assume
    knowledge about which activities are done in probe() and remove()
    
    use devm_get_clk() to lookup the SYS and REF clocks, to have the clocks
    put upon device shutdown
    
    store pointers to data structures upon successful allocation already
    instead of deferral until complete setup, such that subroutines in the
    setup sequence may access those data structures as well to track their
    resource acquisition
    
    since clock allocation remains optional, the release callback as well as
    the enable/disable calls in open/close are optional as well
    
    Cc: linux-can@vger.kernel.org
    Cc: netdev@vger.kernel.org
    Signed-off-by: default avatarGerhard Sittig <gsi@denx.de>
    Signed-off-by: default avatarAnatolij Gustschin <agust@denx.de>
    Signed-off-by: default avatarMarc Kleine-Budde <mkl@pengutronix.de>
    1149108e
mscan.h 9.57 KB