linux-kernel - [PATCH V6 0/2] Add AMD I3C master controller driver and bindings

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Message-ID: <20250910112954.553353-1-manikanta.guntupalli@amd.com>
Date: Wed, 10 Sep 2025 16:59:52 +0530
From: Manikanta Guntupalli <manikanta.guntupalli@....com>
To: <git@....com>, <michal.simek@....com>, <alexandre.belloni@...tlin.com>,
	<Frank.Li@....com>, <robh@...nel.org>, <krzk+dt@...nel.org>,
	<conor+dt@...nel.org>, <kees@...nel.org>, <gustavoars@...nel.org>,
	<jarkko.nikula@...ux.intel.com>, <linux-i3c@...ts.infradead.org>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-hardening@...r.kernel.org>
CC: <radhey.shyam.pandey@....com>, <srinivas.goud@....com>,
	<shubhrajyoti.datta@....com>, <manion05gk@...il.com>, Manikanta Guntupalli
	<manikanta.guntupalli@....com>
Subject: [PATCH V6 0/2] Add AMD I3C master controller driver and bindings

This patch series introduces support for the AMD I3C master controller,
including the device tree binding and driver implementation.

Changes for V2:
Updated commit subject and description.
Moved allOf to after required.
Removed xlnx,num-targets property.
Added mixed mode support with clock configuration.
Converted smaller functions into inline functions.
Used FIELD_GET() in xi3c_get_response().
Updated xi3c_master_rd_from_rx_fifo() to use cmd->rx_buf.
Used parity8() for address parity calculation.
Added guards for locks.
Dropped num_targets and updated xi3c_master_do_daa().
Used __free(kfree) in xi3c_master_send_bdcast_ccc_cmd().
Dropped PM runtime support.
Updated xi3c_master_read() and xi3c_master_write() with
xi3c_is_resp_available() check.
Created separate functions: xi3c_master_init() and xi3c_master_reinit().
Used xi3c_master_init() in bus initialization and xi3c_master_reinit()
in error paths.
Added DAA structure to xi3c_master structure.

Changes for V3:
Updated commit description.
Corrected the order of properties and removed resets property.
Added compatible to required list.
Added interrupts to example.
Resolved merge conflicts.

Changes for V4:
Added h/w documentation details.
Updated timeout macros.
Removed type casting for xi3c_is_resp_available() macro.
Used ioread32() and iowrite32() instead of readl() and writel()
to keep consistency.
Read XI3C_RESET_OFFSET reg before udelay().
Removed xi3c_master_free_xfer() and directly used kfree().
Skipped checking return value of i3c_master_add_i3c_dev_locked().
Used devm_mutex_init() instead of mutex_init().

Changes for V5:
Renamed the xlnx,axi-i3c.yaml file into xlnx,axi-i3c-1.0.yaml.
Used GENMASK_ULL for PID mask as it's 64bit mask.

Changes for V6:
Corrected the $id in the YAML file to match the filename and fix
the dtschema warning.
Removed typecast for xi3c_getrevisionnumber(), xi3c_wrfifolevel(),
and xi3c_rdfifolevel().
Replaced dynamic allocation with a static variable for pid_bcr_dcr.
Fixed sparse warning in do_daa by typecasting the address parity value
to u8.
Fixed sparse warning in xi3c_master_bus_init by typecasting the pid value
to u64 in info.pid calculation.

Manikanta Guntupalli (2):
  dt-bindings: i3c: Add AMD I3C master controller support
  i3c: master: Add AMD I3C bus controller driver

 .../bindings/i3c/xlnx,axi-i3c-1.0.yaml        |   55 +
 MAINTAINERS                                   |    7 +
 drivers/i3c/master/Kconfig                    |   16 +
 drivers/i3c/master/Makefile                   |    1 +
 drivers/i3c/master/amd-i3c-master.c           | 1009 +++++++++++++++++
 5 files changed, 1088 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i3c/xlnx,axi-i3c-1.0.yaml
 create mode 100644 drivers/i3c/master/amd-i3c-master.c

-- 
2.34.1