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Message-Id: <20250111-topic-spmi_node_breakage-v1-1-3f60111a1d19@oss.qualcomm.com>
Date: Sat, 11 Jan 2025 12:21:00 +0100
From: Konrad Dybcio <konradybcio@...nel.org>
To: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
Stephen Boyd <sboyd@...nel.org>, Joe Hattori <joe@...is.s.u-tokyo.ac.jp>
Cc: Marijn Suijten <marijn.suijten@...ainline.org>,
linux-kernel@...r.kernel.org,
Bjorn Andersson <bjorn.andersson@....qualcomm.com>,
Abel Vesa <abel.vesa@...aro.org>, Johan Hovold <johan+linaro@...nel.org>,
Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Subject: [PATCH] spmi: Fix controller->node != parent->node breakage
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
On some platforms, like recent Qualcomm SoCs with multi-bus SPMI
arbiters, controller->node must be assigned to the individual buses'
subnodes, as the slave devices are children of these, like so:
arbiter@...0000
spmi@...d000
pmic@0
spmi@...2000
pmic@0
The commit referenced in Fixes changed that assignment, such that
spmi_controller_alloc() always assumes the PMICs come directly under
the arbiter node (which is true when there's only a single bus per
controller).
Make controller->node specifiable to both benefit from Joe's refcount
improvements and un-break the aforementioned platforms.
Fixes: 821b07853e32 ("spmi: hisi-spmi-controller: manage the OF node reference in device initialization and cleanup")
Signed-off-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
---
drivers/spmi/hisi-spmi-controller.c | 4 +++-
drivers/spmi/spmi-devres.c | 6 ++++--
drivers/spmi/spmi-pmic-arb.c | 2 +-
drivers/spmi/spmi.c | 4 +++-
include/linux/spmi.h | 5 ++++-
5 files changed, 15 insertions(+), 6 deletions(-)
diff --git a/drivers/spmi/hisi-spmi-controller.c b/drivers/spmi/hisi-spmi-controller.c
index dd21c5d1ca8301d508b85dfaf61ddfabed17aca9..7cb056bb5529708d37aeda9f6fa2058d4c7a536a 100644
--- a/drivers/spmi/hisi-spmi-controller.c
+++ b/drivers/spmi/hisi-spmi-controller.c
@@ -267,7 +267,9 @@ static int spmi_controller_probe(struct platform_device *pdev)
struct resource *iores;
int ret;
- ctrl = devm_spmi_controller_alloc(&pdev->dev, sizeof(*spmi_controller));
+ ctrl = devm_spmi_controller_alloc(&pdev->dev,
+ pdev->dev.of_node
+ sizeof(*spmi_controller));
if (IS_ERR(ctrl)) {
dev_err(&pdev->dev, "can not allocate spmi_controller data\n");
return PTR_ERR(ctrl);
diff --git a/drivers/spmi/spmi-devres.c b/drivers/spmi/spmi-devres.c
index 62c4b3f24d0656eea9b6da489b7716b9965bedbe..e84af711714d1892a5781111dc538747f5a5e835 100644
--- a/drivers/spmi/spmi-devres.c
+++ b/drivers/spmi/spmi-devres.c
@@ -11,7 +11,9 @@ static void devm_spmi_controller_release(struct device *parent, void *res)
spmi_controller_put(*(struct spmi_controller **)res);
}
-struct spmi_controller *devm_spmi_controller_alloc(struct device *parent, size_t size)
+struct spmi_controller *devm_spmi_controller_alloc(struct device *parent,
+ struct device_node *node,
+ size_t size)
{
struct spmi_controller **ptr, *ctrl;
@@ -19,7 +21,7 @@ struct spmi_controller *devm_spmi_controller_alloc(struct device *parent, size_t
if (!ptr)
return ERR_PTR(-ENOMEM);
- ctrl = spmi_controller_alloc(parent, size);
+ ctrl = spmi_controller_alloc(parent, node, size);
if (IS_ERR(ctrl)) {
devres_free(ptr);
return ctrl;
diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c
index 73f2f19737f8cec266a051a956ce2123661a714e..226f51d94a70328c6322664d2d05a8b64645674a 100644
--- a/drivers/spmi/spmi-pmic-arb.c
+++ b/drivers/spmi/spmi-pmic-arb.c
@@ -1674,7 +1674,7 @@ static int spmi_pmic_arb_bus_init(struct platform_device *pdev,
int index, ret;
int irq;
- ctrl = devm_spmi_controller_alloc(dev, sizeof(*bus));
+ ctrl = devm_spmi_controller_alloc(dev, node, sizeof(*bus));
if (IS_ERR(ctrl))
return PTR_ERR(ctrl);
diff --git a/drivers/spmi/spmi.c b/drivers/spmi/spmi.c
index 166beb2083a3f801435d8ffd843310582911e3ab..c1a03da55a265c9294f6a16bc285310cebd00726 100644
--- a/drivers/spmi/spmi.c
+++ b/drivers/spmi/spmi.c
@@ -435,6 +435,7 @@ EXPORT_SYMBOL_GPL(spmi_device_alloc);
/**
* spmi_controller_alloc() - Allocate a new SPMI controller
* @parent: parent device
+ * @node: device node to associate with the controller (usually parent->of_node)
* @size: size of private data
*
* Caller is responsible for either calling spmi_controller_add() to add the
@@ -443,6 +444,7 @@ EXPORT_SYMBOL_GPL(spmi_device_alloc);
* spmi_controller_get_drvdata()
*/
struct spmi_controller *spmi_controller_alloc(struct device *parent,
+ struct device_node *node,
size_t size)
{
struct spmi_controller *ctrl;
@@ -459,7 +461,7 @@ struct spmi_controller *spmi_controller_alloc(struct device *parent,
ctrl->dev.type = &spmi_ctrl_type;
ctrl->dev.bus = &spmi_bus_type;
ctrl->dev.parent = parent;
- device_set_node(&ctrl->dev, of_fwnode_handle(of_node_get(parent->of_node)));
+ device_set_node(&ctrl->dev, of_fwnode_handle(of_node_get(node)));
spmi_controller_set_drvdata(ctrl, &ctrl[1]);
id = ida_alloc(&ctrl_ida, GFP_KERNEL);
diff --git a/include/linux/spmi.h b/include/linux/spmi.h
index 28e8c8bd39441fa6451be3364006fb3b47a47dc9..9de74000911456800237a3244d5e8158fadf8317 100644
--- a/include/linux/spmi.h
+++ b/include/linux/spmi.h
@@ -105,6 +105,7 @@ static inline void spmi_controller_set_drvdata(struct spmi_controller *ctrl,
}
struct spmi_controller *spmi_controller_alloc(struct device *parent,
+ struct device_node *node,
size_t size);
/**
@@ -120,7 +121,9 @@ static inline void spmi_controller_put(struct spmi_controller *ctrl)
int spmi_controller_add(struct spmi_controller *ctrl);
void spmi_controller_remove(struct spmi_controller *ctrl);
-struct spmi_controller *devm_spmi_controller_alloc(struct device *parent, size_t size);
+struct spmi_controller *devm_spmi_controller_alloc(struct device *parent,
+ struct device_node *node,
+ size_t size);
int devm_spmi_controller_add(struct device *parent, struct spmi_controller *ctrl);
/**
---
base-commit: 2b88851f583d3c4e40bcd40cfe1965241ec229dd
change-id: 20250111-topic-spmi_node_breakage-f67322a9c1eb
Best regards,
--
Konrad Dybcio <konrad.dybcio@....qualcomm.com>
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