> From: AKASHI Takahiro <takahiro.aka...@linaro.org> > Sent: Thursday, July 27, 2023 03:07 > > Hi Simon, > > Thank you for your extensive review. > > On Wed, Jul 26, 2023 at 06:50:23PM -0600, Simon Glass wrote: > > Hi, > > > > On Wed, 26 Jul 2023 at 02:39, AKASHI Takahiro > > <takahiro.aka...@linaro.org> wrote: > > > > > > SCMI base protocol is mandatory, and once SCMI node is found in a device > > > tree, the protocol handle (udevice) is unconditionally installed to > > > the agent. Then basic information will be retrieved from SCMI server via > > > the protocol and saved into the agent instance's local storage. > > > > > > Signed-off-by: AKASHI Takahiro <takahiro.aka...@linaro.org> > > > --- > > > v2 > > > * use helper functions, removing direct uses of ops > > > --- > > > drivers/firmware/scmi/scmi_agent-uclass.c | 116 ++++++++++++++++++++++ > > > include/scmi_agent-uclass.h | 70 ++++++++++++- > > > 2 files changed, 184 insertions(+), 2 deletions(-) > > > > > > > Reviewed-by: Simon Glass <s...@chromium.org>
Reviewed-by: Etienne Carriere <etienne.carri...@foss.st.com> with below reported typo preferrably addressed. > > > > > diff --git a/drivers/firmware/scmi/scmi_agent-uclass.c > > > b/drivers/firmware/scmi/scmi_agent-uclass.c > > > index 2244fcf487e8..279c2c218913 100644 > > > --- a/drivers/firmware/scmi/scmi_agent-uclass.c > > > +++ b/drivers/firmware/scmi/scmi_agent-uclass.c > > > @@ -57,6 +57,9 @@ struct udevice *scmi_get_protocol(struct udevice *dev, > > > } > > > > > > switch (id) { > > > + case SCMI_PROTOCOL_ID_BASE: > > > + proto = priv->base_dev; > > > + break; > > > case SCMI_PROTOCOL_ID_CLOCK: > > > proto = priv->clock_dev; > > > break; > > > @@ -101,6 +104,9 @@ static int scmi_add_protocol(struct udevice *dev, > > > } > > > > > > switch (proto_id) { > > > + case SCMI_PROTOCOL_ID_BASE: > > > + priv->base_dev = proto; > > > + break; > > > case SCMI_PROTOCOL_ID_CLOCK: > > > priv->clock_dev = proto; > > > break; > > > @@ -229,6 +235,83 @@ int devm_scmi_process_msg(struct udevice *dev, > > > struct scmi_msg *msg) > > > return scmi_process_msg(parent, priv->channel, msg); > > > } > > > > > > +/** > > > + * scmi_fill_base_info - get base information about SCMI server > > > + * @agent: SCMI agent device > > > + * @dev: SCMI protocol device > > > + * > > > + * By using Base protocol commands, collect the base information > > > + * about SCMI server. > > > + * > > > + * Return: 0 on success, error code otherwise > > > + */ > > > +static int scmi_fill_base_info(struct udevice *agent, struct udevice > > > *dev) > > > +{ > > > + struct scmi_agent_priv *priv = dev_get_uclass_plat(agent); > > > + int ret; > > > + > > > + ret = scmi_base_protocol_version(dev, &priv->version); > > > + if (ret) { > > > + dev_err(dev, "protocol_version() failed (%d)\n", ret); > > > + return ret; > > > + } > > > + /* check for required version */ > > > + if (priv->version < SCMI_BASE_PROTOCOL_VERSION) { > > > + dev_err(dev, "base protocol version (%d) lower than > > > expected\n", > > > + priv->version); > > > + return -EPROTO; > > > + } > > > + > > > + ret = scmi_base_protocol_attrs(dev, &priv->num_agents, > > > + &priv->num_protocols); > > > + if (ret) { > > > + dev_err(dev, "protocol_attrs() failed (%d)\n", ret); > > > + return ret; > > > + } > > > + ret = scmi_base_discover_vendor(dev, priv->vendor); > > > + if (ret) { > > > + dev_err(dev, "base_discover_vendor() failed (%d)\n", ret); > > > + return ret; > > > + } > > > + ret = scmi_base_discover_sub_vendor(dev, priv->sub_vendor); > > > + if (ret) { > > > + if (ret != -EOPNOTSUPP) { > > > + dev_err(dev, "base_discover_sub_vendor() failed > > > (%d)\n", > > > + ret); > > > + return ret; > > > + } > > > + strcpy(priv->sub_vendor, "NA"); > > > + } > > > + ret = scmi_base_discover_impl_version(dev, &priv->impl_version); > > > + if (ret) { > > > + dev_err(dev, "base_discover_impl_version() failed (%d)\n", > > > + ret); > > > + return ret; > > > + } > > > + > > > + priv->agent_id = 0xffffffff; /* to avoid false claim */ > > > + ret = scmi_base_discover_agent(dev, 0xffffffff, > > > + &priv->agent_id, priv->agent_name); > > > + if (ret) { > > > + if (ret != -EOPNOTSUPP) { > > > + dev_err(dev, > > > + "base_discover_agent() failed for myself > > > (%d)\n", > > > + ret); > > > + return ret; > > > + } > > > + priv->agent_name[0] = '\0'; > > > + } > > > + > > > + ret = scmi_base_discover_list_protocols(dev, &priv->protocols); > > > + if (ret != priv->num_protocols) { > > > + dev_err(dev, "base_discover_list_protocols() failed > > > (%d)\n", > > > + ret); > > > + return ret; > > > + } > > > + > > > + return 0; > > > +} > > > + > > > /* > > > * SCMI agent devices binds devices of various uclasses depeding on > > > * the FDT description. scmi_bind_protocol() is a generic bind sequence > > > @@ -243,6 +326,39 @@ static int scmi_bind_protocols(struct udevice *dev) > > > struct driver *drv; > > > struct udevice *proto; > > > > > > + if (!uclass_get_device(UCLASS_SCMI_AGENT, 1, &agent)) { > > > + /* This is a second SCMI agent */ > > > + dev_err(dev, "Cannot have more than one SCMI agent\n"); > > > + return -EEXIST; > > > + } > > > + > > > + /* initialize the device from device tree */ > > > + drv = DM_DRIVER_GET(scmi_base_drv); > > > + name = "scmi-base.0"; > > > + ret = device_bind(dev, drv, name, NULL, ofnode_null(), &proto); > > > > Why is this not in the devicetree too? > > I don't know the history of discussions, but it is > because no binding for the base protocol is necessary, I guess, > as it is a mandatory protocol without any customisable parameters. > Please see kernel's Documentation/devicetree/bindings/firmware/arm,scmi.yaml. > > > > + if (ret) { > > > + dev_err(dev, "failed to bind base protocol\n"); > > > + return ret; > > > + } > > > + ret = scmi_add_protocol(dev, SCMI_PROTOCOL_ID_BASE, proto); > > > + if (ret) { > > > + dev_err(dev, "failed to add protocol: %s, ret: %d\n", > > > + proto->name, ret); > > > + return ret; > > > + } > > > + > > > + ret = device_probe(proto); > > > + if (ret) { > > > + dev_err(dev, "failed to probe base protocol\n"); > > > + return ret; > > > + } > > > + > > > + ret = scmi_fill_base_info(dev, proto); > > > + if (ret) { > > > + dev_err(dev, "failed to get base information\n"); > > > + return ret; > > > + } > > > + > > > dev_for_each_subnode(node, dev) { > > > u32 protocol_id; > > > > > > diff --git a/include/scmi_agent-uclass.h b/include/scmi_agent-uclass.h > > > index f9e7d3f51de1..0043a93c8d90 100644 > > > --- a/include/scmi_agent-uclass.h > > > +++ b/include/scmi_agent-uclass.h > > > @@ -5,6 +5,7 @@ > > > #ifndef _SCMI_AGENT_UCLASS_H > > > #define _SCMI_AGENT_UCLASS_H > > > > > > +#include <scmi_protocols.h> > > > #include <dm/device.h> > > > > > > struct scmi_msg; > > > @@ -12,16 +13,81 @@ struct scmi_channel; > > > > > > /** > > > * struct scmi_agent_priv - private data maintained by agent instance > > > + * @version: Version > > > + * @num_agents: Number of agents > > > + * @num_protocols: Number of protocols > > > + * @impl_version: Implementation version > > > + * @protocols: Array of protocol IDs > > > + * @vendor: Vendor name > > > + * @sub_vendor: Sub-vendor name > > > + * @agent_name: Agent name > > > + * agent_id: Identifier of agent typo: s/agent_id/@agent_id/ > > > + * @base_dev: SCMI base protocol device > > > * @clock_dev: SCMI clock protocol device > > > - * @clock_dev: SCMI reset domain protocol device > > > - * @clock_dev: SCMI voltage domain protocol device > > > + * @resetdom_dev: SCMI reset domain protocol device > > > + * @voltagedom_dev: SCMI voltage domain protocol device > > > */ > > > struct scmi_agent_priv { > > > + u32 version; > > > + u32 num_agents; > > > + u32 num_protocols; > > > + u32 impl_version; > > > + u8 *protocols; > > > + u8 vendor[SCMI_BASE_NAME_LENGTH_MAX]; > > > + u8 sub_vendor[SCMI_BASE_NAME_LENGTH_MAX]; > > > + u8 agent_name[SCMI_BASE_NAME_LENGTH_MAX]; > > > + u32 agent_id; > > > + struct udevice *base_dev; > > > struct udevice *clock_dev; > > > struct udevice *resetdom_dev; > > > struct udevice *voltagedom_dev; > > > }; > > > > > > +static inline u32 scmi_version(struct udevice *dev) > > > +{ > > > + return ((struct scmi_agent_priv > > > *)dev_get_uclass_plat(dev))->version; > > > +} > > > + > > > +static inline u32 scmi_num_agents(struct udevice *dev) > > > +{ > > > + return ((struct scmi_agent_priv > > > *)dev_get_uclass_plat(dev))->num_agents; > > > +} > > > + > > > +static inline u32 scmi_num_protocols(struct udevice *dev) > > > +{ > > > + return ((struct scmi_agent_priv > > > *)dev_get_uclass_plat(dev))->num_protocols; > > > +} > > > + > > > +static inline u32 scmi_impl_version(struct udevice *dev) > > > +{ > > > + return ((struct scmi_agent_priv > > > *)dev_get_uclass_plat(dev))->impl_version; > > > +} > > > + > > > +static inline u8 *scmi_protocols(struct udevice *dev) > > > +{ > > > + return ((struct scmi_agent_priv > > > *)dev_get_uclass_plat(dev))->protocols; > > > +} > > > + > > > +static inline u8 *scmi_vendor(struct udevice *dev) > > > +{ > > > + return ((struct scmi_agent_priv > > > *)dev_get_uclass_plat(dev))->vendor; > > > +} > > > + > > > +static inline u8 *scmi_sub_vendor(struct udevice *dev) > > > +{ > > > + return ((struct scmi_agent_priv > > > *)dev_get_uclass_plat(dev))->sub_vendor; > > > +} > > > + > > > +static inline u8 *scmi_agent_name(struct udevice *dev) > > > +{ > > > + return ((struct scmi_agent_priv > > > *)dev_get_uclass_plat(dev))->agent_name; > > > +} > > > + > > > +static inline u32 scmi_agent_id(struct udevice *dev) > > > +{ > > > + return ((struct scmi_agent_priv > > > *)dev_get_uclass_plat(dev))->agent_id; > > > +} > > > > Why these helper functions? It seems better to avoid inlining access > > to dev_get_uclass_plat(). Are you worried about exposing the priv > > struct to clients? > > Well, simply wanted to avoid repeating > "((struct scmi_agent_priv *)dev_get_uclass_plat(dev))->)" in the code. > > Thanks, > -Takahiro Akashi > > > > + > > > /** > > > * struct scmi_transport_ops - The functions that a SCMI transport layer > > >must implement. > > > */ > > > -- > > > 2.41.0 > > > > > > > Regards, > > Simon