3.18-stable review patch. If anyone has any objections, please let me know.
------------------
From: Krzysztof Kozlowski krzk@kernel.org
commit 8985167ecf57f97061599a155bb9652c84ea4913 upstream.
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 a 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 Signed-off-by: Stephen Boyd sboyd@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/clk/clk-s2mps11.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+)
--- a/drivers/clk/clk-s2mps11.c +++ b/drivers/clk/clk-s2mps11.c @@ -285,6 +285,36 @@ static const struct platform_device_id s }; 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 driver 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",