linux-kernel - [PATCH v2 02/11] i3c: master: Replace hard code 2 with macro I3C_ADDR_SLOT

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Message-Id: <20240813-i3c_fix-v2-2-68fe4a050188@nxp.com>
Date: Tue, 13 Aug 2024 11:15:00 -0400
From: Frank Li <Frank.Li@....com>
To: Alexandre Belloni <alexandre.belloni@...tlin.com>, 
 Boris Brezillon <boris.brezillon@...labora.com>, 
 Parshuram Thombare <pthombar@...ence.com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Boris Brezillon <bbrezillon@...nel.org>, Arnd Bergmann <arnd@...db.de>, 
 Miquel Raynal <miquel.raynal@...tlin.com>, 
 Conor Culhane <conor.culhane@...vaco.com>
Cc: linux-i3c@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 imx@...ts.linux.dev, Frank Li <Frank.Li@....com>
Subject: [PATCH v2 02/11] i3c: master: Replace hard code 2 with macro
 I3C_ADDR_SLOT_BITS

Replace the hardcoded value 2, which indicates 2 bits for I3C address
status, with the predefined macro I3C_ADDR_SLOT_BITS.

Improve maintainability and extensibility of the code.

Signed-off-by: Frank Li <Frank.Li@....com>
---
 drivers/i3c/master.c       | 4 ++--
 include/linux/i3c/master.h | 4 +++-
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
index 852b32178b722..85c737554c940 100644
--- a/drivers/i3c/master.c
+++ b/drivers/i3c/master.c
@@ -348,7 +348,7 @@ static enum i3c_addr_slot_status
 i3c_bus_get_addr_slot_status(struct i3c_bus *bus, u16 addr)
 {
 	unsigned long status;
-	int bitpos = addr * 2;
+	int bitpos = addr * I3C_ADDR_SLOT_BITS;
 
 	if (addr > I2C_MAX_ADDR)
 		return I3C_ADDR_SLOT_RSVD;
@@ -362,7 +362,7 @@ i3c_bus_get_addr_slot_status(struct i3c_bus *bus, u16 addr)
 static void i3c_bus_set_addr_slot_status(struct i3c_bus *bus, u16 addr,
 					 enum i3c_addr_slot_status status)
 {
-	int bitpos = addr * 2;
+	int bitpos = addr * I3C_ADDR_SLOT_BITS;
 	unsigned long *ptr;
 
 	if (addr > I2C_MAX_ADDR)
diff --git a/include/linux/i3c/master.h b/include/linux/i3c/master.h
index 074f632868d98..4601b6957f799 100644
--- a/include/linux/i3c/master.h
+++ b/include/linux/i3c/master.h
@@ -299,6 +299,8 @@ enum i3c_addr_slot_status {
 	I3C_ADDR_SLOT_STATUS_MASK = 3,
 };
 
+#define I3C_ADDR_SLOT_BITS 2
+
 /**
  * struct i3c_bus - I3C bus object
  * @cur_master: I3C master currently driving the bus. Since I3C is multi-master
@@ -340,7 +342,7 @@ enum i3c_addr_slot_status {
 struct i3c_bus {
 	struct i3c_dev_desc *cur_master;
 	int id;
-	unsigned long addrslots[((I2C_MAX_ADDR + 1) * 2) / BITS_PER_LONG];
+	unsigned long addrslots[((I2C_MAX_ADDR + 1) * I3C_ADDR_SLOT_BITS) / BITS_PER_LONG];
 	enum i3c_bus_mode mode;
 	struct {
 		unsigned long i3c;

-- 
2.34.1