On 12 March 2013 15:34, Heiko Stübner <[email protected]> wrote: > Am Dienstag, 12. März 2013, 10:57:30 schrieb Thomas Abraham: >> On 12 March 2013 05:15, Heiko Stübner <[email protected]> wrote: >> > The current code adds aliases, if necessary, directly when adding the >> > clock, limiting the number of possible aliases to one. >> > >> > Some platforms need more than one alias, like the hsmmc pclocks on >> > s3c2416 which need a "hsmmc" and "mmc_busclk.0" alias for the s3c-sdhci >> > driver. >> > >> > Therefore add the possibility to separately add clock aliases for >> > previously created clocks. >> > >> > Signed-off-by: Heiko Stuebner <[email protected]> >> > --- >> > change since the discussion: removed the list->alias check >> > >> > drivers/clk/samsung/clk.c | 33 +++++++++++++++++++++++++++++++++ >> > drivers/clk/samsung/clk.h | 21 +++++++++++++++++++++ >> > 2 files changed, 54 insertions(+), 0 deletions(-) >> > >> > diff --git a/drivers/clk/samsung/clk.c b/drivers/clk/samsung/clk.c >> > index 7c943f8..20ec566 100644 >> > --- a/drivers/clk/samsung/clk.c >> > +++ b/drivers/clk/samsung/clk.c >> > @@ -94,6 +94,39 @@ void samsung_clk_add_lookup(struct clk *clk, unsigned >> > int id) >> > >> > clk_table[id] = clk; >> > >> > } >> > >> > +/* register a list of aliases */ >> > +void __init samsung_clk_register_alias(struct samsung_clock_alias *list, >> > + unsigned int nr_clk) >> > +{ >> > + struct clk *clk; >> > + unsigned int idx, ret; >> > + >> > + if (!clk_table) { >> > + pr_err("%s: clock table missing\n", __func__); >> > + return; >> > + } >> > + >> > + for (idx = 0; idx < nr_clk; idx++, list++) { >> > + if (!list->id) { >> > + pr_err("%s: clock id missing for index %d\n", >> > __func__, + idx); >> > + continue; >> > + } >> > + >> > + clk = clk_table[list->id]; >> > + if (!clk) { >> > + pr_err("%s: failed to find clock %d\n", __func__, >> > + list->id); >> > + continue; >> > + } >> > + >> > + ret = clk_register_clkdev(clk, list->alias, >> > list->dev_name); + if (ret) >> > + pr_err("%s: failed to register lookup %s\n", >> > + __func__, list->alias); >> > + } >> > +} >> > + >> > >> > /* register a list of fixed clocks */ >> > void __init samsung_clk_register_fixed_rate( >> > >> > struct samsung_fixed_rate_clock *list, unsigned int >> > nr_clk) >> > >> > diff --git a/drivers/clk/samsung/clk.h b/drivers/clk/samsung/clk.h >> > index 26a752b..6bacd6f 100644 >> > --- a/drivers/clk/samsung/clk.h >> > +++ b/drivers/clk/samsung/clk.h >> > @@ -23,6 +23,25 @@ >> > >> > #include <mach/map.h> >> > >> > /** >> > >> > + * struct samsung_clock_alias: information about mux clock >> > + * @id: platform specific id of the clock. >> > + * @dev_name: name of the device to which this clock belongs. >> > + * @alias: optional clock alias name to be assigned to this clock. >> > + */ >> > +struct samsung_clock_alias { >> > + unsigned int id; >> > + const char *dev_name; >> > + const char *alias; >> > +}; >> > + >> > +#define ALIAS(_id, dname, a) \ >> > + { \ >> > + .id = _id, \ >> > + .dev_name = dname, \ >> > + .alias = a, \ >> > + } >> > + >> > +/** >> > >> > * struct samsung_fixed_rate_clock: information about fixed-rate clock >> > * @id: platform specific id of the clock. >> > * @name: name of this fixed-rate clock. >> > >> > @@ -251,6 +270,8 @@ extern void __init samsung_clk_of_register_fixed_ext( >> > >> > extern void samsung_clk_add_lookup(struct clk *clk, unsigned int id); >> > >> > +extern void samsung_clk_register_alias(struct samsung_clock_alias *list, >> > + unsigned int nr_clk); >> > >> > extern void __init samsung_clk_register_fixed_rate( >> > >> > struct samsung_fixed_rate_clock *clk_list, unsigned int >> > nr_clk); >> > >> > extern void __init samsung_clk_register_fixed_factor( >> > >> > -- >> > 1.7.2.3 >> >> This change looks fine but as discussed on 3/4 patch of this series, >> allocating clk_table for non-dt platforms would not be very helpful. > > But how would we look up the previously registered clk otherwise? > Using clk_table for this lookup seemed like the best way to easily access > these clocks.
I did assume that the aliases for a clock are set when that clock is registered. Are there any instances where the aliases have to be set after a clock has been registered (using the samsung clock driver helper functions)? Thanks, Thomas. > > > Thanks > Heiko -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
