linux-kernel - [PATCH v4 2/9] media: i2c: ds90ub960: Replace aliased clients list with address list

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Message-Id: <20241230-fpc202-v4-2-761b297dc697@bootlin.com>
Date: Mon, 30 Dec 2024 14:22:04 +0100
From: Romain Gantois <romain.gantois@...tlin.com>
To: Wolfram Sang <wsa+renesas@...g-engineering.com>, 
 Tomi Valkeinen <tomi.valkeinen@...asonboard.com>, 
 Luca Ceresoli <luca.ceresoli@...tlin.com>, 
 Andi Shyti <andi.shyti@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Derek Kiernan <derek.kiernan@....com>, 
 Dragan Cvetic <dragan.cvetic@....com>, Arnd Bergmann <arnd@...db.de>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>, 
 Linus Walleij <linus.walleij@...aro.org>, 
 Bartosz Golaszewski <brgl@...ev.pl>
Cc: Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
 Kory Maincent <kory.maincent@...tlin.com>, linux-i2c@...r.kernel.org, 
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-media@...r.kernel.org, linux-gpio@...r.kernel.org, 
 Romain Gantois <romain.gantois@...tlin.com>
Subject: [PATCH v4 2/9] media: i2c: ds90ub960: Replace aliased clients list
 with address list

The ds90ub960 driver currently uses a list of i2c_client structs to keep
track of used I2C address translator (ATR) alias slots for each RX port.

Keeping these i2c_client structs in the alias slot list isn't actually
needed, the driver only needs to know the client address for each slot.

Convert the aliased_clients list to a list of aliased client addresses.
This will allow removing the "client" parameter from the i2c-atr callbacks
in a future patch.

Signed-off-by: Romain Gantois <romain.gantois@...tlin.com>
---
 drivers/media/i2c/ds90ub960.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/media/i2c/ds90ub960.c b/drivers/media/i2c/ds90ub960.c
index 33f362a008757578e4c96e6ea7bed2e590776d8d..7534ddf2079fef466d3a114f0be98599427639fa 100644
--- a/drivers/media/i2c/ds90ub960.c
+++ b/drivers/media/i2c/ds90ub960.c
@@ -467,7 +467,7 @@ struct ub960_rxport {
 		};
 	} eq;
 
-	const struct i2c_client *aliased_clients[UB960_MAX_PORT_ALIASES];
+	u16 aliased_addrs[UB960_MAX_PORT_ALIASES];
 };
 
 struct ub960_asd {
@@ -1031,17 +1031,17 @@ static int ub960_atr_attach_client(struct i2c_atr *atr, u32 chan_id,
 	struct device *dev = &priv->client->dev;
 	unsigned int reg_idx;
 
-	for (reg_idx = 0; reg_idx < ARRAY_SIZE(rxport->aliased_clients); reg_idx++) {
-		if (!rxport->aliased_clients[reg_idx])
+	for (reg_idx = 0; reg_idx < UB960_MAX_PORT_ALIASES; reg_idx++) {
+		if (!rxport->aliased_addrs[reg_idx])
 			break;
 	}
 
-	if (reg_idx == ARRAY_SIZE(rxport->aliased_clients)) {
+	if (reg_idx == UB960_MAX_PORT_ALIASES) {
 		dev_err(dev, "rx%u: alias pool exhausted\n", rxport->nport);
 		return -EADDRNOTAVAIL;
 	}
 
-	rxport->aliased_clients[reg_idx] = client;
+	rxport->aliased_addrs[reg_idx] = client->addr;
 
 	ub960_rxport_write(priv, chan_id, UB960_RR_SLAVE_ID(reg_idx),
 			   client->addr << 1);
@@ -1062,18 +1062,18 @@ static void ub960_atr_detach_client(struct i2c_atr *atr, u32 chan_id,
 	struct device *dev = &priv->client->dev;
 	unsigned int reg_idx;
 
-	for (reg_idx = 0; reg_idx < ARRAY_SIZE(rxport->aliased_clients); reg_idx++) {
-		if (rxport->aliased_clients[reg_idx] == client)
+	for (reg_idx = 0; reg_idx < UB960_MAX_PORT_ALIASES; reg_idx++) {
+		if (rxport->aliased_addrs[reg_idx] == client->addr)
 			break;
 	}
 
-	if (reg_idx == ARRAY_SIZE(rxport->aliased_clients)) {
+	if (reg_idx == UB960_MAX_PORT_ALIASES) {
 		dev_err(dev, "rx%u: client 0x%02x is not mapped!\n",
 			rxport->nport, client->addr);
 		return;
 	}
 
-	rxport->aliased_clients[reg_idx] = NULL;
+	rxport->aliased_addrs[reg_idx] = 0;
 
 	ub960_rxport_write(priv, chan_id, UB960_RR_SLAVE_ALIAS(reg_idx), 0);
 

-- 
2.47.1