The change looks good to me, however if you change from
platform_get_drvdata() to dev_get_drvdata(), you might also want to
change from using platform_set_drvdata() to dev_set_drvdata() for
symmetry no? If not, then maybe this patch should be dropped?

In theory, yes. However, I haven't finished the coccinelle script yet
because there are a lot more usage patterns. I can do this individually
for this driver first if you want.