greybus-dev December 2025

greybus-dev@lists.linaro.org

10 participants
14 discussions

[PATCH] staging: greybus: split gb_audio_gb_get_topology() into helper functions

by Khaled Saleh

The gb_audio_gb_get_topology() function performs multiple distinct operations: retrieving the topology size, allocating the topology buffer, and fetching the topology data. A TODO comment in the file notes that this logic should be split into separate calls. Introduce helper functions for each step and update gb_audio_gb_get_topology() to use them. This improves readability and maintainability without changing behavior. Signed-off-by: Khaled Saleh <khaled.saleh.req(a)gmail.com> --- drivers/staging/greybus/audio_gb.c | 47 +++++++++++++++++++++++------- 1 file changed, 36 insertions(+), 11 deletions(-) diff --git a/drivers/staging/greybus/audio_gb.c b/drivers/staging/greybus/audio_gb.c index 9d8994fdb41a..0d5109ec14f6 100644 --- a/drivers/staging/greybus/audio_gb.c +++ b/drivers/staging/greybus/audio_gb.c @@ -9,36 +9,61 @@ #include "audio_codec.h" /* TODO: Split into separate calls */ +static int gb_audio_topology_get_size(struct gb_connection *connection, u16 *size) +{ + struct gb_audio_get_topology_size_response resp; + int ret; + + ret = gb_operation_sync(connection, + GB_AUDIO_TYPE_GET_TOPOLOGY_SIZE, + NULL, 0, + &resp, sizeof(resp)); + if (ret) + return ret; + + *size = le16_to_cpu(resp.size); + + return 0; +} + +static struct gb_audio_topology *gb_audio_topology_alloc(u16 size) +{ + if (size < sizeof(struct gb_audio_topology)) + return NULL; + + return kzalloc(size, GFP_KERNEL); +} + +static int gb_audio_topology_fetch(struct gb_connection *connection, + struct gb_audio_topology *topo, u16 size) +{ + return gb_operation_sync(connection, + GB_AUDIO_TYPE_GET_TOPOLOGY, + NULL, 0, + topo, size); +} int gb_audio_gb_get_topology(struct gb_connection *connection, struct gb_audio_topology **topology) { - struct gb_audio_get_topology_size_response size_resp; struct gb_audio_topology *topo; u16 size; int ret; - ret = gb_operation_sync(connection, GB_AUDIO_TYPE_GET_TOPOLOGY_SIZE, - NULL, 0, &size_resp, sizeof(size_resp)); + ret = gb_audio_topology_get_size(connection, &size); if (ret) return ret; - size = le16_to_cpu(size_resp.size); - if (size < sizeof(*topo)) - return -ENODATA; - - topo = kzalloc(size, GFP_KERNEL); + topo = gb_audio_topology_alloc(size); if (!topo) return -ENOMEM; - ret = gb_operation_sync(connection, GB_AUDIO_TYPE_GET_TOPOLOGY, NULL, 0, - topo, size); + ret = gb_audio_topology_fetch(connection, topo, size); if (ret) { kfree(topo); return ret; } *topology = topo; - return 0; } EXPORT_SYMBOL_GPL(gb_audio_gb_get_topology); -- 2.43.0

6 hours, 21 minutes

Re: [PATCH] staging: greybus: split gb_audio_gb_get_topology() into helper functions

by Greg KH

On Sun, Dec 21, 2025 at 09:42:00PM +0200, Khaled Saleh wrote: > From: khaled <khaled.saleh.req(a)gmail.com> This, does not match: > Signed-off-by: Khaled Saleh <khaled.saleh.req(a)gmail.com> this. Please fix up for your next submission of this change. thanks, greg k-h

16 hours, 13 minutes

[PATCH] staging: greybus: split gb_audio_gb_get_topology() into helper functions

by Khaled Saleh

From: khaled <khaled.saleh.req(a)gmail.com> The gb_audio_gb_get_topology() function performs multiple distinct operations: retrieving the topology size, allocating the topology buffer, and fetching the topology data. A TODO comment in the file notes that this logic should be split into separate calls. Introduce helper functions for each step and update gb_audio_gb_get_topology() to use them. This improves readability and maintainability without changing behavior. Signed-off-by: Khaled Saleh <khaled.saleh.req(a)gmail.com> --- drivers/staging/greybus/audio_gb.c | 47 +++++++++++++++++++++++------- 1 file changed, 36 insertions(+), 11 deletions(-) diff --git a/drivers/staging/greybus/audio_gb.c b/drivers/staging/greybus/audio_gb.c index 9d8994fdb41a..0d5109ec14f6 100644 --- a/drivers/staging/greybus/audio_gb.c +++ b/drivers/staging/greybus/audio_gb.c @@ -9,36 +9,61 @@ #include "audio_codec.h" /* TODO: Split into separate calls */ +static int gb_audio_topology_get_size(struct gb_connection *connection, u16 *size) +{ + struct gb_audio_get_topology_size_response resp; + int ret; + + ret = gb_operation_sync(connection, + GB_AUDIO_TYPE_GET_TOPOLOGY_SIZE, + NULL, 0, + &resp, sizeof(resp)); + if (ret) + return ret; + + *size = le16_to_cpu(resp.size); + + return 0; +} + +static struct gb_audio_topology *gb_audio_topology_alloc(u16 size) +{ + if (size < sizeof(struct gb_audio_topology)) + return NULL; + + return kzalloc(size, GFP_KERNEL); +} + +static int gb_audio_topology_fetch(struct gb_connection *connection, + struct gb_audio_topology *topo, u16 size) +{ + return gb_operation_sync(connection, + GB_AUDIO_TYPE_GET_TOPOLOGY, + NULL, 0, + topo, size); +} int gb_audio_gb_get_topology(struct gb_connection *connection, struct gb_audio_topology **topology) { - struct gb_audio_get_topology_size_response size_resp; struct gb_audio_topology *topo; u16 size; int ret; - ret = gb_operation_sync(connection, GB_AUDIO_TYPE_GET_TOPOLOGY_SIZE, - NULL, 0, &size_resp, sizeof(size_resp)); + ret = gb_audio_topology_get_size(connection, &size); if (ret) return ret; - size = le16_to_cpu(size_resp.size); - if (size < sizeof(*topo)) - return -ENODATA; - - topo = kzalloc(size, GFP_KERNEL); + topo = gb_audio_topology_alloc(size); if (!topo) return -ENOMEM; - ret = gb_operation_sync(connection, GB_AUDIO_TYPE_GET_TOPOLOGY, NULL, 0, - topo, size); + ret = gb_audio_topology_fetch(connection, topo, size); if (ret) { kfree(topo); return ret; } *topology = topo; - return 0; } EXPORT_SYMBOL_GPL(gb_audio_gb_get_topology); -- 2.43.0

1 day, 2 hours

[PATCH v2 1/1] staging: greybus: Remove completed PWM TODO item.

by Sammy Malik

The pwm.c driver already uses pwm_ops::apply. This item was completed in commit 832ce36f44a2 ("staging: greybus: introduce pwm_ops::apply") but never removed from the TODO list. Removed the outdated TODO item. Signed-off-by: Sammy Malik <sammy(a)parkour.is> --- Changes in v2: - Added commit reference 832ce36f44a2 that originally implemented pwm_ops::apply - Fixed typos: PWN -> PWM, pwn_ops -> pwm_ops drivers/staging/greybus/TODO | 2 -- 1 file changed, 2 deletions(-) diff --git a/drivers/staging/greybus/TODO b/drivers/staging/greybus/TODO index 6461e0132fe3..31f1f2cb401c 100644 --- a/drivers/staging/greybus/TODO +++ b/drivers/staging/greybus/TODO @@ -1,5 +1,3 @@ * Convert all uses of the old GPIO API from <linux/gpio.h> to the GPIO descriptor API in <linux/gpio/consumer.h> and look up GPIO lines from device tree or ACPI. -* Make pwm.c use the struct pwm_ops::apply instead of ::config, ::set_polarity, - ::enable and ::disable. -- 2.52.0

2 days, 8 hours

[PATCH 0/3] staging: greybus: arche-platform: fix probe issues

by Johan Hovold

This series fixes some issues with the arche platform drivers probe function. A fix for the first issue was sent to the list two months ago, but there has been no reply to the review feedback given then. Non of these are tagged for stable backport as very few people should have the hardware in question and be bothered by this. Johan Johan Hovold (3): staging: greybus: arche-platform: fix coldboot probe error path staging: greybus: arche-platform: fix memleak on probe failure staging: greybus: arche-platform: fix OF populate on driver rebind drivers/staging/greybus/arche-platform.c | 23 ++++++++--------------- 1 file changed, 8 insertions(+), 15 deletions(-) -- 2.51.2

3 days, 11 hours

[PATCH] staging: greybus: Remove completed PWN TODO item.

by Sammy Malik

The pwm.c driver already uses pwn_ops::apply. This item was completed but never removed. Removed the outdated TODO item. Signed-off-by: Sammy Malik <sammy(a)parkour.is> --- drivers/staging/greybus/TODO | 2 -- 1 file changed, 2 deletions(-) diff --git a/drivers/staging/greybus/TODO b/drivers/staging/greybus/TODO index 6461e0132fe3..31f1f2cb401c 100644 --- a/drivers/staging/greybus/TODO +++ b/drivers/staging/greybus/TODO @@ -1,5 +1,3 @@ * Convert all uses of the old GPIO API from <linux/gpio.h> to the GPIO descriptor API in <linux/gpio/consumer.h> and look up GPIO lines from device tree or ACPI. -* Make pwm.c use the struct pwm_ops::apply instead of ::config, ::set_polarity, - ::enable and ::disable. -- 2.52.0

5 days, 9 hours

[PATCH 00/14] greybus: introduce CPC as transport layer

by Damien Riégel

Hi, This patchset brings support for Silicon Labs' Co-Processor Communication (CPC) protocol as transport layer for Greybus. This is introduced as a module that sits between Greybus and CPC Host Device Drivers implementations, like SDIO or SPI. This patchset includes SDIO as physical layer but the protocol is not final and might change, it's mostly there to showcase all the elements. +----------------------------------------------------+ | Greybus | +----------------------------------------------------+ /|\ | \|/ +----------------------------------------------------+ | CPC | +----------------------------------------------------+ /|\ /|\ /|\ | | | \|/ \|/ \|/ +----------+ +---------+ +-----------+ | SDIO | | SPI | | Others | +----------+ +---------+ +-----------+ CPC implements some of the features of Unipro that Greybus relies upon, like reliable transmission. CPC takes care of detecting transmission errors and retransmit frames if necessary, but that feature is not part of the RFC to keep it concise. There's also a flow-control feature, preventing sending messages to already full cports. In order to implement these features, a 4-byte header is prepended to Greybus messages, making the whole header 12 bytes (Greybus header itself is 8 bytes). This RFC starts by implementing a shim layer between physical bus drivers (like SDIO and SPI) and Greybus, and progressively add more elements to it to make it useful in its own right. Finally, an SDIO driver is added to enable the communication with a remote device. Changes since the RFC: - added missing Signed-off-by on one commit - added SDIO driver to give a full example Damien Riégel (13): greybus: cpc: add minimal CPC Host Device infrastructure greybus: cpc: introduce CPC cport structure greybus: cpc: use socket buffers instead of gb_message in TX path greybus: cpc: pack cport ID in Greybus header greybus: cpc: switch RX path to socket buffers greybus: cpc: introduce CPC header structure greybus: cpc: account for CPC header size in RX and TX path greybus: cpc: add and validate sequence numbers greybus: cpc: acknowledge all incoming messages greybus: cpc: use holding queue instead of sending out immediately greybus: cpc: honour remote's RX window greybus: cpc: let host device drivers dequeue TX frames greybus: cpc: add private data pointer in CPC Host Device Gabriel Beaulieu (1): greybus: cpc: add CPC SDIO host driver MAINTAINERS | 6 + drivers/greybus/Kconfig | 2 + drivers/greybus/Makefile | 2 + drivers/greybus/cpc/Kconfig | 22 ++ drivers/greybus/cpc/Makefile | 9 + drivers/greybus/cpc/cpc.h | 75 +++++ drivers/greybus/cpc/cport.c | 107 +++++++ drivers/greybus/cpc/header.c | 146 +++++++++ drivers/greybus/cpc/header.h | 55 ++++ drivers/greybus/cpc/host.c | 313 +++++++++++++++++++ drivers/greybus/cpc/host.h | 63 ++++ drivers/greybus/cpc/protocol.c | 167 ++++++++++ drivers/greybus/cpc/sdio.c | 554 +++++++++++++++++++++++++++++++++ 13 files changed, 1521 insertions(+) create mode 100644 drivers/greybus/cpc/Kconfig create mode 100644 drivers/greybus/cpc/Makefile create mode 100644 drivers/greybus/cpc/cpc.h create mode 100644 drivers/greybus/cpc/cport.c create mode 100644 drivers/greybus/cpc/header.c create mode 100644 drivers/greybus/cpc/header.h create mode 100644 drivers/greybus/cpc/host.c create mode 100644 drivers/greybus/cpc/host.h create mode 100644 drivers/greybus/cpc/protocol.c create mode 100644 drivers/greybus/cpc/sdio.c -- 2.49.0

1 week, 1 day

[PATCH] greybus: Use bus methods for .probe() and .remove()

by Uwe Kleine-König

These are nearly identical to the respective driver callbacks. The only difference is that .remove() returns void instead of int. The objective is to get rid of users of struct device_driver callbacks .probe() and .remove() to eventually remove these. Signed-off-by: Uwe Kleine-König <u.kleine-koenig(a)baylibre.com> --- drivers/greybus/core.c | 22 ++++++++++------------ 1 file changed, 10 insertions(+), 12 deletions(-) diff --git a/drivers/greybus/core.c b/drivers/greybus/core.c index 313eb65cf703..927a69feb3fc 100644 --- a/drivers/greybus/core.c +++ b/drivers/greybus/core.c @@ -185,13 +185,6 @@ static void greybus_shutdown(struct device *dev) } } -const struct bus_type greybus_bus_type = { - .name = "greybus", - .match = greybus_match_device, - .uevent = greybus_uevent, - .shutdown = greybus_shutdown, -}; - static int greybus_probe(struct device *dev) { struct greybus_driver *driver = to_greybus_driver(dev->driver); @@ -252,7 +245,7 @@ static int greybus_probe(struct device *dev) return 0; } -static int greybus_remove(struct device *dev) +static void greybus_remove(struct device *dev) { struct greybus_driver *driver = to_greybus_driver(dev->driver); struct gb_bundle *bundle = to_gb_bundle(dev); @@ -291,10 +284,17 @@ static int greybus_remove(struct device *dev) pm_runtime_set_suspended(dev); pm_runtime_dont_use_autosuspend(dev); pm_runtime_put_noidle(dev); - - return 0; } +const struct bus_type greybus_bus_type = { + .name = "greybus", + .match = greybus_match_device, + .uevent = greybus_uevent, + .probe = greybus_probe, + .remove = greybus_remove, + .shutdown = greybus_shutdown, +}; + int greybus_register_driver(struct greybus_driver *driver, struct module *owner, const char *mod_name) { @@ -305,8 +305,6 @@ int greybus_register_driver(struct greybus_driver *driver, struct module *owner, driver->driver.bus = &greybus_bus_type; driver->driver.name = driver->name; - driver->driver.probe = greybus_probe; - driver->driver.remove = greybus_remove; driver->driver.owner = owner; driver->driver.mod_name = mod_name; base-commit: 7d0a66e4bb9081d75c82ec4957c50034cb0ea449 -- 2.47.3

1 week, 5 days

[PATCH v6] staging: greybus: arche-apb-ctrl: switch to device_property_read_bool

by Julio Cesar Carvalho de Paula Souza

Switch from the deprecated of_property_read_bool() to the common device_property_read_bool() API. This makes the driver agnostic to the underlying firmware interface (DT or ACPI) and simplifies the logic. Since the driver is no longer strictly dependent on Device Tree, include <linux/mod_devicetable.h> directly for the struct of_device_id definition, instead of relying on implicit inclusion via <linux/of_irq.h>, which has been removed as it is unused. Also rename apb_ctrl_get_devtree_data() to apb_ctrl_get_fw_data() to better reflect the agnostic nature of the new implementation. Signed-off-by: Julio Cesar Carvalho de Paula Souza <julio191096(a)gmail.com> --- Changes in v6: - Aligned function arguments with the open parenthesis in function declaration. Changes in v5: - Fixed 'From' header mismatch(updated git config user.name) - Fixed indentation aligment in function declaration as pointed out by Dan Carpenter Changes in v4: - Fixed a typo in the v3 commit Changes in v3: - Added changelog history as requested by the maintainer bot. Changes in v2: - Shortened the subject line to match subsystem standards. - Updated Signed-off-by to use full real name. drivers/staging/greybus/arche-apb-ctrl.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/drivers/staging/greybus/arche-apb-ctrl.c b/drivers/staging/greybus/arche-apb-ctrl.c index 90ab32638d3f..33f26a65f0cc 100644 --- a/drivers/staging/greybus/arche-apb-ctrl.c +++ b/drivers/staging/greybus/arche-apb-ctrl.c @@ -10,13 +10,14 @@ #include <linux/delay.h> #include <linux/gpio/consumer.h> #include <linux/interrupt.h> -#include <linux/of_irq.h> #include <linux/module.h> #include <linux/pinctrl/consumer.h> #include <linux/platform_device.h> #include <linux/pm.h> +#include <linux/property.h> #include <linux/regulator/consumer.h> #include <linux/spinlock.h> +#include <linux/mod_devicetable.h> #include "arche_platform.h" static void apb_bootret_deassert(struct device *dev); @@ -314,8 +315,8 @@ static ssize_t state_show(struct device *dev, static DEVICE_ATTR_RW(state); -static int apb_ctrl_get_devtree_data(struct platform_device *pdev, - struct arche_apb_ctrl_drvdata *apb) +static int apb_ctrl_get_fw_data(struct platform_device *pdev, + struct arche_apb_ctrl_drvdata *apb) { struct device *dev = &pdev->dev; int ret; @@ -378,7 +379,7 @@ static int apb_ctrl_get_devtree_data(struct platform_device *pdev, } /* Only applicable for platform >= V2 */ - if (of_property_read_bool(pdev->dev.of_node, "gb,spi-en-active-high")) + if (device_property_read_bool(&pdev->dev, "gb,spi-en-active-high")) apb->spi_en_polarity_high = true; return 0; @@ -394,7 +395,7 @@ static int arche_apb_ctrl_probe(struct platform_device *pdev) if (!apb) return -ENOMEM; - ret = apb_ctrl_get_devtree_data(pdev, apb); + ret = apb_ctrl_get_fw_data(pdev, apb); if (ret) { dev_err(dev, "failed to get apb devicetree data %d\n", ret); return ret; @@ -403,7 +404,7 @@ static int arche_apb_ctrl_probe(struct platform_device *pdev) /* Initially set APB to OFF state */ apb->state = ARCHE_PLATFORM_STATE_OFF; /* Check whether device needs to be enabled on boot */ - if (of_property_read_bool(pdev->dev.of_node, "arche,init-disable")) + if (device_property_read_bool(&pdev->dev, "arche,init-disable")) apb->init_disabled = true; platform_set_drvdata(pdev, apb); -- 2.52.0

2 weeks, 3 days

[PATCH v5] staging: greybus: arche-apb-ctrl: switch to device_property_read_bool

by Julio Cesar Carvalho de Paula Souza

Switch from the deprecated of_property_read_bool() to the common device_property_read_bool() API. This makes the driver agnostic to the underlying firmware interface (DT or ACPI) and simplifies the logic. Since the driver is no longer strictly dependent on Device Tree, include <linux/mod_devicetable.h> directly for the struct of_device_id definition, instead of relying on implicit inclusion via <linux/of_irq.h>, which has been removed as it is unused. Also rename apb_ctrl_get_devtree_data() to apb_ctrl_get_fw_data() to better reflect the agnostic nature of the new implementation. Signed-off-by: Julio Cesar Carvalho de Paula Souza <julio191096(a)gmail.com> --- Changes in v5: - Fixed 'From' header mismatch(updated git config user.name) - Fixed indentation aligment in function declaration as pointed out by Dan Carpenter Changes in v4: - Fixed a typo in the v3 commit Changes in v3: - Added changelog history as requested by the maintainer bot. Changes in v2: - Shortened the subject line to match subsystem standards. - Updated Signed-off-by to use full real name. drivers/staging/greybus/arche-apb-ctrl.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/drivers/staging/greybus/arche-apb-ctrl.c b/drivers/staging/greybus/arche-apb-ctrl.c index 90ab32638d3f..6a4efa9a9e0e 100644 --- a/drivers/staging/greybus/arche-apb-ctrl.c +++ b/drivers/staging/greybus/arche-apb-ctrl.c @@ -10,13 +10,14 @@ #include <linux/delay.h> #include <linux/gpio/consumer.h> #include <linux/interrupt.h> -#include <linux/of_irq.h> #include <linux/module.h> #include <linux/pinctrl/consumer.h> #include <linux/platform_device.h> #include <linux/pm.h> +#include <linux/property.h> #include <linux/regulator/consumer.h> #include <linux/spinlock.h> +#include <linux/mod_devicetable.h> #include "arche_platform.h" static void apb_bootret_deassert(struct device *dev); @@ -314,8 +315,8 @@ static ssize_t state_show(struct device *dev, static DEVICE_ATTR_RW(state); -static int apb_ctrl_get_devtree_data(struct platform_device *pdev, - struct arche_apb_ctrl_drvdata *apb) +static int apb_ctrl_get_fw_data(struct platform_device *pdev, + struct arche_apb_ctrl_drvdata *apb) { struct device *dev = &pdev->dev; int ret; @@ -378,7 +379,7 @@ static int apb_ctrl_get_devtree_data(struct platform_device *pdev, } /* Only applicable for platform >= V2 */ - if (of_property_read_bool(pdev->dev.of_node, "gb,spi-en-active-high")) + if (device_property_read_bool(&pdev->dev, "gb,spi-en-active-high")) apb->spi_en_polarity_high = true; return 0; @@ -394,7 +395,7 @@ static int arche_apb_ctrl_probe(struct platform_device *pdev) if (!apb) return -ENOMEM; - ret = apb_ctrl_get_devtree_data(pdev, apb); + ret = apb_ctrl_get_fw_data(pdev, apb); if (ret) { dev_err(dev, "failed to get apb devicetree data %d\n", ret); return ret; @@ -403,7 +404,7 @@ static int arche_apb_ctrl_probe(struct platform_device *pdev) /* Initially set APB to OFF state */ apb->state = ARCHE_PLATFORM_STATE_OFF; /* Check whether device needs to be enabled on boot */ - if (of_property_read_bool(pdev->dev.of_node, "arche,init-disable")) + if (device_property_read_bool(&pdev->dev, "arche,init-disable")) apb->init_disabled = true; platform_set_drvdata(pdev, apb); -- 2.52.0

2 weeks, 3 days

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

greybus-dev December 2025