On 08/04/2016 10:57 PM, Stephen Boyd wrote:

On 07/19, Masahiro Yamada wrote:

quoted

quoted

The .get(_hw) callback of an OF clock provider can return a NULL
pointer in some cases.

For example, of_clk_src_onecell_get() returns NULL for index 1 of a
sparse array of clocks like follows:

  clk_num == 3
  idx 0: UART clk
  idx 1: NULL (no clk is allocated)
  idx 2: I2C clk

In such cases, clk_get() successfully returns NULL.

I remember running into same issue before, we have addressed
it by initializing the array of clocks with some errno value,
e.g ERR_PTR(-ENOENT), so there is no chance to get NULL from
the array - either a valid clk pointer or an ERR_PTR() value.

--
Thanks,
Sylwester