Messages in this thread | | | Date | Thu, 23 Jan 2014 11:56:32 +0100 | From | Lothar Waßmann <> | Subject | Re: [PATCH 1/2] PWM: let of_xlate handlers check args count |
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Hi,
Sascha Hauer wrote: > of_pwm_n_cells for the of_xlate handler is stored in struct pwm_chip, > but it is only ever used by the of_xlate handler itsel. Remove > of_pwm_n_cells from struct pwm_chip and let the handler do the argument > count checking to simplify the code. > This still does not make the PWM_POLARITY flag in the pwms node optional as was the goal because of_parse_phandle_with_args() requires at least #pwm-cells arguments in the node.
So, with a DT configuration like: pwm0: pwm@0 { #pwm-cells = <3>; }; backlight { pwms = <&pwm0 0 100000>; }; the driver will bail out at of_parse_phandle_with_args() in of_pwm_get() with the error message: "/backlight: arguments longer than property" and never reach your clever xlate function.
Thus you will still need to replace of_parse_phandle_with_args() with different code that copies most but not all of the functionality.
Lothar Waßmann -- ___________________________________________________________
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