* [PATCH 1/3] clk: s2mps11: Fix matching when built as module and DT node contains compatible
2018-07-25 15:55 [PATCH 0/3] clk/dts: s2mps11: Fix matching as module Krzysztof Kozlowski
@ 2018-07-25 15:55 ` Krzysztof Kozlowski
2018-07-25 23:48 ` Stephen Boyd
2018-07-25 15:55 ` [PATCH 2/3] ARM: dts: exynos: Add compatible for s2mps11 clocks node on Exynos542x Krzysztof Kozlowski
2018-07-25 15:55 ` [PATCH 3/3] ARM: dts: exynos: Add compatible for s5m8767 clocks node on Itop Core Krzysztof Kozlowski
2 siblings, 1 reply; 5+ messages in thread
From: Krzysztof Kozlowski @ 2018-07-25 15:55 UTC (permalink / raw)
To: linux-arm-kernel
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(+)
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",
--
2.14.1
^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCH 2/3] ARM: dts: exynos: Add compatible for s2mps11 clocks node on Exynos542x
2018-07-25 15:55 [PATCH 0/3] clk/dts: s2mps11: Fix matching as module Krzysztof Kozlowski
2018-07-25 15:55 ` [PATCH 1/3] clk: s2mps11: Fix matching when built as module and DT node contains compatible Krzysztof Kozlowski
@ 2018-07-25 15:55 ` Krzysztof Kozlowski
2018-07-25 15:55 ` [PATCH 3/3] ARM: dts: exynos: Add compatible for s5m8767 clocks node on Itop Core Krzysztof Kozlowski
2 siblings, 0 replies; 5+ messages in thread
From: Krzysztof Kozlowski @ 2018-07-25 15:55 UTC (permalink / raw)
To: linux-arm-kernel
The bindings for s2mps11/s5m8767 clocks driver require a compatible for
clocks node. Parent MFD sec-core driver will also use it when
instantiating children.
The compatible is not needed for proper working because device will be
anyway created by parent MFD device. Add it for correctness.
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
---
arch/arm/boot/dts/exynos5420-arndale-octa.dts | 1 +
arch/arm/boot/dts/exynos5420-smdk5420.dts | 1 +
arch/arm/boot/dts/exynos5422-odroid-core.dtsi | 1 +
3 files changed, 3 insertions(+)
diff --git a/arch/arm/boot/dts/exynos5420-arndale-octa.dts b/arch/arm/boot/dts/exynos5420-arndale-octa.dts
index cdda614e417e..3447160e1fbf 100644
--- a/arch/arm/boot/dts/exynos5420-arndale-octa.dts
+++ b/arch/arm/boot/dts/exynos5420-arndale-octa.dts
@@ -89,6 +89,7 @@
pinctrl-0 = <&s2mps11_irq>;
s2mps11_osc: clocks {
+ compatible = "samsung,s2mps11-clk";
#clock-cells = <1>;
clock-output-names = "s2mps11_ap",
"s2mps11_cp", "s2mps11_bt";
diff --git a/arch/arm/boot/dts/exynos5420-smdk5420.dts b/arch/arm/boot/dts/exynos5420-smdk5420.dts
index 831c7336f237..3cf905047893 100644
--- a/arch/arm/boot/dts/exynos5420-smdk5420.dts
+++ b/arch/arm/boot/dts/exynos5420-smdk5420.dts
@@ -141,6 +141,7 @@
reg = <0x66>;
s2mps11_osc: clocks {
+ compatible = "samsung,s2mps11-clk";
#clock-cells = <1>;
clock-output-names = "s2mps11_ap",
"s2mps11_cp", "s2mps11_bt";
diff --git a/arch/arm/boot/dts/exynos5422-odroid-core.dtsi b/arch/arm/boot/dts/exynos5422-odroid-core.dtsi
index 2f4f40882dab..a368c73a1e48 100644
--- a/arch/arm/boot/dts/exynos5422-odroid-core.dtsi
+++ b/arch/arm/boot/dts/exynos5422-odroid-core.dtsi
@@ -141,6 +141,7 @@
pinctrl-0 = <&s2mps11_irq>;
s2mps11_osc: clocks {
+ compatible = "samsung,s2mps11-clk";
#clock-cells = <1>;
clock-output-names = "s2mps11_ap",
"s2mps11_cp", "s2mps11_bt";
--
2.14.1
^ permalink raw reply related [flat|nested] 5+ messages in thread