[PATCH] rtc: Add fallbacks for dm functions

[Tom Rini]

On Fri, Sep 23, 2022 at 02:30:16PM -0400, Sean Anderson wrote:

> This adds fallbacks for the various dm_rtc_* functions. This allows
> common code to use these functions without ifdefs.
> 
> Fixes: c8ce7ba87d1 ("misc: Add support for nvmem cells")
> Signed-off-by: Sean Anderson <sean.anderson at seco.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>

This breaks a number of platforms such as malta64el:
+include/rtc.h: In function 'dm_rtc_get':
+include/rtc.h:225:17: error: 'ENOSYS' undeclared (first use in this function)
+  225 |         return -ENOSYS;
+      |                 ^~~~~~

-- 
Tom
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