lkml.org 
[lkml]   [2014]   [Sep]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH V1] ASoC: fsl_ssi: refine ipg clock usage in this module
On Tue, Sep 09, 2014 at 03:03:53PM -0500, Timur Tabi wrote:
> On 09/09/2014 02:59 PM, Nicolin Chen wrote:
> >+ /*
> >+ * Initially mark the clock to NULL for all platforms so that later
> >+ * clk_prepare_enable() will ignore and return 0 for non-clock cases.
> >+ */
> >+ ssi_private->clk = NULL;
>
> According to Mark, NULL is a valid clock, so this should be instead:
>
> ssi_private->clk = PTR_ERR(-EINVAL);
>
> although that doesn't sit well with me.

I guess Mark's comment is merely against the check for clk validation
because if talking about clk validation, we should check IS_ERR(clk)
rather than check !=NULL directly.

However, my approach doesn't need any check. The open() or pm_resume()
can just call clk_prepare_enable() directly. The __clk_enable() will
then handle the 'clk == NULL' case:

static int __clk_enable(struct clk *clk)
{
int ret = 0;

if (!clk)
return 0;


\
 
 \ /
  Last update: 2014-09-09 23:01    [W:0.068 / U:0.064 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site