Hi, Stephen
> -----Original Message-----
> From: Stephen Boyd <[email protected]>
> Sent: Monday, June 10, 2019 11:14 PM
> To: [email protected]; [email protected];
> [email protected]; [email protected];
> [email protected]; [email protected];
> [email protected]; [email protected];
> [email protected]; [email protected]; linux-arm-
> [email protected]; [email protected]; linux-
> [email protected]; [email protected];
> [email protected]; [email protected]; [email protected];
> [email protected]; s.hauer@pengutronix .de <[email protected]>;
> [email protected]; [email protected]; Abel Vesa
> <[email protected]>; Aisheng Dong <[email protected]>; Anson
> Huang <[email protected]>; Jacky Bai <[email protected]>; Leonard
> Crestez <[email protected]>
> Cc: dl-linux-imx <[email protected]>
> Subject: RE: [PATCH V3 3/4] clk: imx: Add support for i.MX8MN clock driver
>
> Quoting Anson Huang (2019-06-08 02:58:18)
> > Hi, Stephen
> >
> > > -----Original Message-----
> > > From: Stephen Boyd <[email protected]>
> > > Sent: Saturday, June 8, 2019 2:01 AM
> > > To: [email protected]; [email protected];
> > > [email protected]; [email protected];
> > > [email protected]; [email protected];
> > > [email protected]; [email protected];
> > > [email protected]; [email protected]; linux-arm-
> > > [email protected]; [email protected]; linux-
> > > [email protected]; [email protected];
> > > [email protected]; [email protected]; [email protected];
> > > [email protected]; s.hauer@pengutronix .de
> > > robh+<[email protected]>;
> > > [email protected]; [email protected]; Abel Vesa
> > > <[email protected]>; Aisheng Dong <[email protected]>; Anson
> > > Huang <[email protected]>; Jacky Bai <[email protected]>;
> Leonard
> > > Crestez <[email protected]>
> > > Cc: dl-linux-imx <[email protected]>
> > > Subject: RE: [PATCH V3 3/4] clk: imx: Add support for i.MX8MN clock
> > > driver
> > >
> > > Quoting Anson Huang (2019-06-06 17:50:28)
> > > >
> > > > I will use devm_platform_ioremap_resource() instead of ioremap(),
> > > > and can you be more specific about devmified clk registration?
> > > >
> > >
> > > I mean using things like devm_clk_hw_register().
> >
> > Sorry, I am still a little confused, all the clock
> > register(clk_register()) are via each different clock types like
> > imx_clk_gate4/imx_clk_pll14xx, if using clk_hw_register, means we need
> > to re-write the clock driver using different clk register method, that
> > will make the driver completely different from i.mx8mq/i.mx8mm, they
> > are actually same series of SoC as i.mx8mn, it will introduce many
> confusion, is my understanding correct? And is it OK to just keep what it is
> and make them all aligned?
> >
>
> Ok, the problem I'm trying to point out is that clk registrations need to be
> undone, i.e. clk_unregister() needs to be called, when the driver fails to
> probe. devm_*() is one way to do this, but if you have other ways of
> removing all the registered clks then that works too. Makes sense?
Yes, it makes sense. Do you think it is OK to add an imx_unregister_clocks()
API, then
call it in every place of returning failure in .probe function? If yes, I will
add it and also
fix it in i.MX8MQ driver which uses platform driver model but does NOT handle
this case.
base = devm_platform_ioremap_resource(pdev, 0);
- if (WARN_ON(IS_ERR(base)))
- return PTR_ERR(base);
+ if (WARN_ON(IS_ERR(base))) {
+ ret = PTR_ERR(base);
+ goto unregister_clks;
+ }
pr_err("failed to register clks for i.MX8MN\n");
- return -EINVAL;
+ goto unregister_clks;
}
return 0;
+
+unregister_clks:
+ imx_unregister_clocks(clks, ARRAY_SIZE(clks));
+
+ return ret;
+void imx_unregister_clocks(struct clk *clks[], unsigned int count)
+{
+ unsigned i;
+
+ for (i = 0; i < count; i++)
+ clk_unregister(clks[i]);
+}
+
Thanks,
Anson.
