| Message ID | 20180725155517.4872-2-krzk@kernel.org (mailing list archive) |
|---|---|
| State | Awaiting Upstream, archived |
| Headers | show |
| Series | clk/dts: s2mps11: Fix matching as module | expand |
Quoting Krzysztof Kozlowski (2018-07-25 08:55:15) > When driver is built as module and DT node contains clocks compatible > (e.g. "samsung,s2mps11-clk"), the module will not be autoloaded because > module aliases won't match. > > The modalias from uevent: of:NclocksT<NULL>Csamsung,s2mps11-clk > The modalias from driver: platform:s2mps11-clk > > The devices are instantiated by parent's MFD. However both Device Tree > bindings and parent define the compatible for clocks devices. In case > of module matching this DT compatible will be used. > > The issue will not happen if this is built-in (no need for module > matching) or when clocks DT node does not contain compatible (not > correct from bindings perspective but working for driver). > > Note when backporting to stable kernels: adjust the list of device ID > entries. > > Cc: <stable@vger.kernel.org> > Fixes: 53c31b3437a6 ("mfd: sec-core: Add of_compatible strings for clock MFD cells") > Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org> > --- Acked-by: Stephen Boyd <sboyd@kernel.org> -- To unsubscribe from this list: send the line "unsubscribe linux-clk" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/clk/clk-s2mps11.c b/drivers/clk/clk-s2mps11.c index d44e0eea31ec..11a1e83ff805 100644 --- a/drivers/clk/clk-s2mps11.c +++ b/drivers/clk/clk-s2mps11.c @@ -245,6 +245,36 @@ static const struct platform_device_id s2mps11_clk_id[] = { }; MODULE_DEVICE_TABLE(platform, s2mps11_clk_id); +#ifdef CONFIG_OF +/* + * Device is instantiated through parent MFD device and device matching is done + * through platform_device_id. + * + * However if device's DT node contains proper clock compatible and it is built + * as a module, then the module matching will be done trough DT aliases. This + * requires of_device_id table. In the same time this will not change the + * actual device matching so do not add .of_match_table. + */ +static const struct of_device_id s2mps11_dt_match[] = { + { + .compatible = "samsung,s2mps11-clk", + .data = (void *)S2MPS11X, + }, { + .compatible = "samsung,s2mps13-clk", + .data = (void *)S2MPS13X, + }, { + .compatible = "samsung,s2mps14-clk", + .data = (void *)S2MPS14X, + }, { + .compatible = "samsung,s5m8767-clk", + .data = (void *)S5M8767X, + }, { + /* Sentinel */ + }, +}; +MODULE_DEVICE_TABLE(of, s2mps11_dt_match); +#endif + static struct platform_driver s2mps11_clk_driver = { .driver = { .name = "s2mps11-clk",
When driver is built as module and DT node contains clocks compatible (e.g. "samsung,s2mps11-clk"), the module will not be autoloaded because module aliases won't match. The modalias from uevent: of:NclocksT<NULL>Csamsung,s2mps11-clk The modalias from driver: platform:s2mps11-clk The devices are instantiated by parent's MFD. However both Device Tree bindings and parent define the compatible for clocks devices. In case of module matching this DT compatible will be used. The issue will not happen if this is built-in (no need for module matching) or when clocks DT node does not contain compatible (not correct from bindings perspective but working for driver). Note when backporting to stable kernels: adjust the list of device ID entries. Cc: <stable@vger.kernel.org> Fixes: 53c31b3437a6 ("mfd: sec-core: Add of_compatible strings for clock MFD cells") Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org> --- drivers/clk/clk-s2mps11.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+)