[PATCH v6 01/14] scmi: refactor the code to hide a channel from devices
AKASHI Takahiro
takahiro.akashi at linaro.org
Wed Oct 11 12:06:54 CEST 2023
The commit 85dc58289238 ("firmware: scmi: prepare uclass to pass channel
reference") added an explicit parameter, channel, but it seems to make
the code complex.
Hiding this parameter will allow for adding a generic (protocol-agnostic)
helper function, i.e. for PROTOCOL_VERSION, in a later patch.
Signed-off-by: AKASHI Takahiro <takahiro.akashi at linaro.org>
Reviewed-by: Simon Glass <sjg at chromium.org>
Reviewed-by: Etienne Carriere <etienne.carriere at foss.st.com>
---
v5
* correct the size for per_child_auto
v4
* revive scmi_bind_protocols which was accidentally removed
* remove .per_child_auto from the driver declaration as it is not needed
v3
* fix an issue on ST board (reported by Etienne)
by taking care of cases where probed devices are children of
SCMI protocol device (i.e. clock devices under CCF)
See find_scmi_protocol_device().
* move "per_device_plato_auto" to a succeeding right patch
v2
* new patch
---
drivers/clk/clk_scmi.c | 27 ++----
drivers/firmware/scmi/scmi_agent-uclass.c | 105 ++++++++++++++++------
drivers/power/regulator/scmi_regulator.c | 26 ++----
drivers/reset/reset-scmi.c | 19 +---
include/scmi_agent.h | 15 ++--
5 files changed, 104 insertions(+), 88 deletions(-)
diff --git a/drivers/clk/clk_scmi.c b/drivers/clk/clk_scmi.c
index d172fed24c9d..34a49363a51a 100644
--- a/drivers/clk/clk_scmi.c
+++ b/drivers/clk/clk_scmi.c
@@ -13,17 +13,8 @@
#include <asm/types.h>
#include <linux/clk-provider.h>
-/**
- * struct scmi_clk_priv - Private data for SCMI clocks
- * @channel: Reference to the SCMI channel to use
- */
-struct scmi_clk_priv {
- struct scmi_channel *channel;
-};
-
static int scmi_clk_get_num_clock(struct udevice *dev, size_t *num_clocks)
{
- struct scmi_clk_priv *priv = dev_get_priv(dev);
struct scmi_clk_protocol_attr_out out;
struct scmi_msg msg = {
.protocol_id = SCMI_PROTOCOL_ID_CLOCK,
@@ -33,7 +24,7 @@ static int scmi_clk_get_num_clock(struct udevice *dev, size_t *num_clocks)
};
int ret;
- ret = devm_scmi_process_msg(dev, priv->channel, &msg);
+ ret = devm_scmi_process_msg(dev, &msg);
if (ret)
return ret;
@@ -44,7 +35,6 @@ static int scmi_clk_get_num_clock(struct udevice *dev, size_t *num_clocks)
static int scmi_clk_get_attibute(struct udevice *dev, int clkid, char **name)
{
- struct scmi_clk_priv *priv = dev_get_priv(dev);
struct scmi_clk_attribute_in in = {
.clock_id = clkid,
};
@@ -59,7 +49,7 @@ static int scmi_clk_get_attibute(struct udevice *dev, int clkid, char **name)
};
int ret;
- ret = devm_scmi_process_msg(dev, priv->channel, &msg);
+ ret = devm_scmi_process_msg(dev, &msg);
if (ret)
return ret;
@@ -70,7 +60,6 @@ static int scmi_clk_get_attibute(struct udevice *dev, int clkid, char **name)
static int scmi_clk_gate(struct clk *clk, int enable)
{
- struct scmi_clk_priv *priv = dev_get_priv(clk->dev);
struct scmi_clk_state_in in = {
.clock_id = clk->id,
.attributes = enable,
@@ -81,7 +70,7 @@ static int scmi_clk_gate(struct clk *clk, int enable)
in, out);
int ret;
- ret = devm_scmi_process_msg(clk->dev, priv->channel, &msg);
+ ret = devm_scmi_process_msg(clk->dev, &msg);
if (ret)
return ret;
@@ -100,7 +89,6 @@ static int scmi_clk_disable(struct clk *clk)
static ulong scmi_clk_get_rate(struct clk *clk)
{
- struct scmi_clk_priv *priv = dev_get_priv(clk->dev);
struct scmi_clk_rate_get_in in = {
.clock_id = clk->id,
};
@@ -110,7 +98,7 @@ static ulong scmi_clk_get_rate(struct clk *clk)
in, out);
int ret;
- ret = devm_scmi_process_msg(clk->dev, priv->channel, &msg);
+ ret = devm_scmi_process_msg(clk->dev, &msg);
if (ret < 0)
return ret;
@@ -123,7 +111,6 @@ static ulong scmi_clk_get_rate(struct clk *clk)
static ulong scmi_clk_set_rate(struct clk *clk, ulong rate)
{
- struct scmi_clk_priv *priv = dev_get_priv(clk->dev);
struct scmi_clk_rate_set_in in = {
.clock_id = clk->id,
.flags = SCMI_CLK_RATE_ROUND_CLOSEST,
@@ -136,7 +123,7 @@ static ulong scmi_clk_set_rate(struct clk *clk, ulong rate)
in, out);
int ret;
- ret = devm_scmi_process_msg(clk->dev, priv->channel, &msg);
+ ret = devm_scmi_process_msg(clk->dev, &msg);
if (ret < 0)
return ret;
@@ -149,12 +136,11 @@ static ulong scmi_clk_set_rate(struct clk *clk, ulong rate)
static int scmi_clk_probe(struct udevice *dev)
{
- struct scmi_clk_priv *priv = dev_get_priv(dev);
struct clk *clk;
size_t num_clocks, i;
int ret;
- ret = devm_scmi_of_get_channel(dev, &priv->channel);
+ ret = devm_scmi_of_get_channel(dev);
if (ret)
return ret;
@@ -205,5 +191,4 @@ U_BOOT_DRIVER(scmi_clock) = {
.id = UCLASS_CLK,
.ops = &scmi_clk_ops,
.probe = scmi_clk_probe,
- .priv_auto = sizeof(struct scmi_clk_priv *),
};
diff --git a/drivers/firmware/scmi/scmi_agent-uclass.c b/drivers/firmware/scmi/scmi_agent-uclass.c
index 02de692d66f3..ec58ccd2bc5d 100644
--- a/drivers/firmware/scmi/scmi_agent-uclass.c
+++ b/drivers/firmware/scmi/scmi_agent-uclass.c
@@ -8,6 +8,7 @@
#include <common.h>
#include <dm.h>
#include <errno.h>
+#include <scmi_agent.h>
#include <scmi_agent-uclass.h>
#include <scmi_protocols.h>
#include <dm/device_compat.h>
@@ -110,18 +111,23 @@ static int scmi_bind_protocols(struct udevice *dev)
return ret;
}
-static struct udevice *find_scmi_transport_device(struct udevice *dev)
+static struct udevice *find_scmi_protocol_device(struct udevice *dev)
{
- struct udevice *parent = dev;
+ struct udevice *parent = NULL, *protocol;
- do {
- parent = dev_get_parent(parent);
- } while (parent && device_get_uclass_id(parent) != UCLASS_SCMI_AGENT);
+ for (protocol = dev; protocol; protocol = parent) {
+ parent = dev_get_parent(protocol);
+ if (!parent ||
+ device_get_uclass_id(parent) == UCLASS_SCMI_AGENT)
+ break;
+ }
- if (!parent)
+ if (!parent) {
dev_err(dev, "Invalid SCMI device, agent not found\n");
+ return NULL;
+ }
- return parent;
+ return protocol;
}
static const struct scmi_agent_ops *transport_dev_ops(struct udevice *dev)
@@ -129,43 +135,90 @@ static const struct scmi_agent_ops *transport_dev_ops(struct udevice *dev)
return (const struct scmi_agent_ops *)dev->driver->ops;
}
-int devm_scmi_of_get_channel(struct udevice *dev, struct scmi_channel **channel)
+/**
+ * scmi_of_get_channel() - Get SCMI channel handle
+ *
+ * @dev: SCMI agent device
+ * @channel: Output reference to the SCMI channel upon success
+ *
+ * On return, @channel will be set.
+ * Return 0 on success and a negative errno on failure
+ */
+static int scmi_of_get_channel(struct udevice *dev, struct scmi_channel **channel)
{
- struct udevice *parent;
+ const struct scmi_agent_ops *ops;
- parent = find_scmi_transport_device(dev);
- if (!parent)
+ ops = transport_dev_ops(dev);
+ if (ops->of_get_channel)
+ return ops->of_get_channel(dev, channel);
+ else
+ return -EPROTONOSUPPORT;
+}
+
+int devm_scmi_of_get_channel(struct udevice *dev)
+{
+ struct udevice *protocol;
+ struct scmi_agent_proto_priv *priv;
+ int ret;
+
+ protocol = find_scmi_protocol_device(dev);
+ if (!protocol)
return -ENODEV;
- if (transport_dev_ops(parent)->of_get_channel)
- return transport_dev_ops(parent)->of_get_channel(parent, channel);
+ priv = dev_get_parent_priv(protocol);
+ ret = scmi_of_get_channel(protocol->parent, &priv->channel);
+ if (ret == -EPROTONOSUPPORT) {
+ /* Drivers without a get_channel operator don't need a channel ref */
+ priv->channel = NULL;
- /* Drivers without a get_channel operator don't need a channel ref */
- *channel = NULL;
+ return 0;
+ }
- return 0;
+ return ret;
}
-int devm_scmi_process_msg(struct udevice *dev, struct scmi_channel *channel,
- struct scmi_msg *msg)
+/**
+ * scmi_process_msg() - Send and process an SCMI message
+ *
+ * Send a message to an SCMI server.
+ * Caller sets scmi_msg::out_msg_sz to the output message buffer size.
+ *
+ * @dev: SCMI agent device
+ * @channel: Communication channel for the device
+ * @msg: Message structure reference
+ *
+ * On return, scmi_msg::out_msg_sz stores the response payload size.
+ * Return: 0 on success and a negative errno on failure
+ */
+static int scmi_process_msg(struct udevice *dev, struct scmi_channel *channel,
+ struct scmi_msg *msg)
{
const struct scmi_agent_ops *ops;
- struct udevice *parent;
- parent = find_scmi_transport_device(dev);
- if (!parent)
- return -ENODEV;
+ ops = transport_dev_ops(dev);
+ if (ops->process_msg)
+ return ops->process_msg(dev, channel, msg);
+ else
+ return -EPROTONOSUPPORT;
+}
- ops = transport_dev_ops(parent);
+int devm_scmi_process_msg(struct udevice *dev, struct scmi_msg *msg)
+{
+ struct udevice *protocol;
+ struct scmi_agent_proto_priv *priv;
- if (ops->process_msg)
- return ops->process_msg(parent, channel, msg);
+ protocol = find_scmi_protocol_device(dev);
+ if (!protocol)
+ return -ENODEV;
+
+ priv = dev_get_parent_priv(protocol);
- return -EPROTONOSUPPORT;
+ return scmi_process_msg(protocol->parent, priv->channel, msg);
}
UCLASS_DRIVER(scmi_agent) = {
.id = UCLASS_SCMI_AGENT,
.name = "scmi_agent",
.post_bind = scmi_bind_protocols,
+ .per_child_auto = sizeof(struct scmi_agent_proto_priv),
};
diff --git a/drivers/power/regulator/scmi_regulator.c b/drivers/power/regulator/scmi_regulator.c
index 801148036ff6..9c72c35d039e 100644
--- a/drivers/power/regulator/scmi_regulator.c
+++ b/drivers/power/regulator/scmi_regulator.c
@@ -25,18 +25,9 @@ struct scmi_regulator_platdata {
u32 domain_id;
};
-/**
- * struct scmi_regulator_priv - Private data for SCMI voltage regulator
- * @channel: Reference to the SCMI channel to use
- */
-struct scmi_regulator_priv {
- struct scmi_channel *channel;
-};
-
static int scmi_voltd_set_enable(struct udevice *dev, bool enable)
{
struct scmi_regulator_platdata *pdata = dev_get_plat(dev);
- struct scmi_regulator_priv *priv = dev_get_priv(dev);
struct scmi_voltd_config_set_in in = {
.domain_id = pdata->domain_id,
.config = enable ? SCMI_VOLTD_CONFIG_ON : SCMI_VOLTD_CONFIG_OFF,
@@ -47,7 +38,7 @@ static int scmi_voltd_set_enable(struct udevice *dev, bool enable)
in, out);
int ret;
- ret = devm_scmi_process_msg(dev, priv->channel, &msg);
+ ret = devm_scmi_process_msg(dev, &msg);
if (ret)
return ret;
@@ -57,7 +48,6 @@ static int scmi_voltd_set_enable(struct udevice *dev, bool enable)
static int scmi_voltd_get_enable(struct udevice *dev)
{
struct scmi_regulator_platdata *pdata = dev_get_plat(dev);
- struct scmi_regulator_priv *priv = dev_get_priv(dev);
struct scmi_voltd_config_get_in in = {
.domain_id = pdata->domain_id,
};
@@ -67,7 +57,7 @@ static int scmi_voltd_get_enable(struct udevice *dev)
in, out);
int ret;
- ret = devm_scmi_process_msg(dev, priv->channel, &msg);
+ ret = devm_scmi_process_msg(dev, &msg);
if (ret < 0)
return ret;
@@ -80,7 +70,6 @@ static int scmi_voltd_get_enable(struct udevice *dev)
static int scmi_voltd_set_voltage_level(struct udevice *dev, int uV)
{
- struct scmi_regulator_priv *priv = dev_get_priv(dev);
struct scmi_regulator_platdata *pdata = dev_get_plat(dev);
struct scmi_voltd_level_set_in in = {
.domain_id = pdata->domain_id,
@@ -92,7 +81,7 @@ static int scmi_voltd_set_voltage_level(struct udevice *dev, int uV)
in, out);
int ret;
- ret = devm_scmi_process_msg(dev, priv->channel, &msg);
+ ret = devm_scmi_process_msg(dev, &msg);
if (ret < 0)
return ret;
@@ -101,7 +90,6 @@ static int scmi_voltd_set_voltage_level(struct udevice *dev, int uV)
static int scmi_voltd_get_voltage_level(struct udevice *dev)
{
- struct scmi_regulator_priv *priv = dev_get_priv(dev);
struct scmi_regulator_platdata *pdata = dev_get_plat(dev);
struct scmi_voltd_level_get_in in = {
.domain_id = pdata->domain_id,
@@ -112,7 +100,7 @@ static int scmi_voltd_get_voltage_level(struct udevice *dev)
in, out);
int ret;
- ret = devm_scmi_process_msg(dev, priv->channel, &msg);
+ ret = devm_scmi_process_msg(dev, &msg);
if (ret < 0)
return ret;
@@ -140,7 +128,6 @@ static int scmi_regulator_of_to_plat(struct udevice *dev)
static int scmi_regulator_probe(struct udevice *dev)
{
struct scmi_regulator_platdata *pdata = dev_get_plat(dev);
- struct scmi_regulator_priv *priv = dev_get_priv(dev);
struct scmi_voltd_attr_in in = { 0 };
struct scmi_voltd_attr_out out = { 0 };
struct scmi_msg scmi_msg = {
@@ -153,14 +140,14 @@ static int scmi_regulator_probe(struct udevice *dev)
};
int ret;
- ret = devm_scmi_of_get_channel(dev->parent, &priv->channel);
+ ret = devm_scmi_of_get_channel(dev);
if (ret)
return ret;
/* Check voltage domain is known from SCMI server */
in.domain_id = pdata->domain_id;
- ret = devm_scmi_process_msg(dev, priv->channel, &scmi_msg);
+ ret = devm_scmi_process_msg(dev, &scmi_msg);
if (ret) {
dev_err(dev, "Failed to query voltage domain %u: %d\n",
pdata->domain_id, ret);
@@ -184,7 +171,6 @@ U_BOOT_DRIVER(scmi_regulator) = {
.probe = scmi_regulator_probe,
.of_to_plat = scmi_regulator_of_to_plat,
.plat_auto = sizeof(struct scmi_regulator_platdata),
- .priv_auto = sizeof(struct scmi_regulator_priv *),
};
static int scmi_regulator_bind(struct udevice *dev)
diff --git a/drivers/reset/reset-scmi.c b/drivers/reset/reset-scmi.c
index 122556162ec3..b76711f0a8fb 100644
--- a/drivers/reset/reset-scmi.c
+++ b/drivers/reset/reset-scmi.c
@@ -13,17 +13,8 @@
#include <scmi_protocols.h>
#include <asm/types.h>
-/**
- * struct scmi_reset_priv - Private data for SCMI reset controller
- * @channel: Reference to the SCMI channel to use
- */
-struct scmi_reset_priv {
- struct scmi_channel *channel;
-};
-
static int scmi_reset_set_level(struct reset_ctl *rst, bool assert_not_deassert)
{
- struct scmi_reset_priv *priv = dev_get_priv(rst->dev);
struct scmi_rd_reset_in in = {
.domain_id = rst->id,
.flags = assert_not_deassert ? SCMI_RD_RESET_FLAG_ASSERT : 0,
@@ -35,7 +26,7 @@ static int scmi_reset_set_level(struct reset_ctl *rst, bool assert_not_deassert)
in, out);
int ret;
- ret = devm_scmi_process_msg(rst->dev, priv->channel, &msg);
+ ret = devm_scmi_process_msg(rst->dev, &msg);
if (ret)
return ret;
@@ -54,7 +45,6 @@ static int scmi_reset_deassert(struct reset_ctl *rst)
static int scmi_reset_request(struct reset_ctl *rst)
{
- struct scmi_reset_priv *priv = dev_get_priv(rst->dev);
struct scmi_rd_attr_in in = {
.domain_id = rst->id,
};
@@ -68,7 +58,7 @@ static int scmi_reset_request(struct reset_ctl *rst)
* We don't really care about the attribute, just check
* the reset domain exists.
*/
- ret = devm_scmi_process_msg(rst->dev, priv->channel, &msg);
+ ret = devm_scmi_process_msg(rst->dev, &msg);
if (ret)
return ret;
@@ -83,9 +73,7 @@ static const struct reset_ops scmi_reset_domain_ops = {
static int scmi_reset_probe(struct udevice *dev)
{
- struct scmi_reset_priv *priv = dev_get_priv(dev);
-
- return devm_scmi_of_get_channel(dev, &priv->channel);
+ return devm_scmi_of_get_channel(dev);
}
U_BOOT_DRIVER(scmi_reset_domain) = {
@@ -93,5 +81,4 @@ U_BOOT_DRIVER(scmi_reset_domain) = {
.id = UCLASS_RESET,
.ops = &scmi_reset_domain_ops,
.probe = scmi_reset_probe,
- .priv_auto = sizeof(struct scmi_reset_priv *),
};
diff --git a/include/scmi_agent.h b/include/scmi_agent.h
index ee6286366df7..577892029ff8 100644
--- a/include/scmi_agent.h
+++ b/include/scmi_agent.h
@@ -15,6 +15,14 @@
struct udevice;
struct scmi_channel;
+/**
+ * struct scmi_agent_proto_priv - Private data in device for SCMI agent
+ * @channel: Reference to the SCMI channel to use
+ */
+struct scmi_agent_proto_priv {
+ struct scmi_channel *channel;
+};
+
/*
* struct scmi_msg - Context of a SCMI message sent and the response received
*
@@ -49,10 +57,9 @@ struct scmi_msg {
* devm_scmi_of_get_channel() - Get SCMI channel handle from SCMI agent DT node
*
* @dev: Device requesting a channel
- * @channel: Output reference to the SCMI channel upon success
* @return 0 on success and a negative errno on failure
*/
-int devm_scmi_of_get_channel(struct udevice *dev, struct scmi_channel **channel);
+int devm_scmi_of_get_channel(struct udevice *dev);
/**
* devm_scmi_process_msg() - Send and process an SCMI message
@@ -62,12 +69,10 @@ int devm_scmi_of_get_channel(struct udevice *dev, struct scmi_channel **channel)
* On return, scmi_msg::out_msg_sz stores the response payload size.
*
* @dev: SCMI device
- * @channel: Communication channel for the device
* @msg: Message structure reference
* Return: 0 on success and a negative errno on failure
*/
-int devm_scmi_process_msg(struct udevice *dev, struct scmi_channel *channel,
- struct scmi_msg *msg);
+int devm_scmi_process_msg(struct udevice *dev, struct scmi_msg *msg);
/**
* scmi_to_linux_errno() - Convert an SCMI error code into a Linux errno code
--
2.34.1
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