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Wed, 07 May 2025 05:19:35 -0700 (PDT) Received: from demon-pc.localdomain ([188.27.128.5]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-5fa777557b9sm9350002a12.10.2025.05.07.05.19.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 May 2025 05:19:35 -0700 (PDT) From: Cosmin Tanislav To: Cc: Wolfram Sang , Tomi Valkeinen , Luca Ceresoli , Mauro Carvalho Chehab , Romain Gantois , Arnd Bergmann , Greg Kroah-Hartman , linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, Cosmin Tanislav Subject: [PATCH v5 8/9] i2c: atr: add static flag Date: Wed, 7 May 2025 15:19:14 +0300 Message-ID: <20250507121917.2364416-9-demonsingur@gmail.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250507121917.2364416-1-demonsingur@gmail.com> References: <20250507121917.2364416-1-demonsingur@gmail.com> Precedence: bulk X-Mailing-List: linux-i2c@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Some I2C ATRs do not support dynamic remapping, only static mapping of direct children. Mappings will only be added or removed as a result of devices being added or removed from a child bus. The ATR pool will have to be big enough to accomodate all devices expected to be added to the child buses. Add a new flag that prevents old mappings to be replaced or new mappings to be created in the alias finding code paths. Signed-off-by: Cosmin Tanislav --- drivers/i2c/i2c-atr.c | 6 +++++- include/linux/i2c-atr.h | 7 +++++++ 2 files changed, 12 insertions(+), 1 deletion(-) diff --git a/drivers/i2c/i2c-atr.c b/drivers/i2c/i2c-atr.c index 121cabbdb85d..76d70efdf190 100644 --- a/drivers/i2c/i2c-atr.c +++ b/drivers/i2c/i2c-atr.c @@ -341,12 +341,16 @@ i2c_atr_replace_mapping_by_addr(struct i2c_atr_chan *chan, u16 addr) static struct i2c_atr_alias_pair * i2c_atr_get_mapping_by_addr(struct i2c_atr_chan *chan, u16 addr) { + struct i2c_atr *atr = chan->atr; struct i2c_atr_alias_pair *c2a; c2a = i2c_atr_find_mapping_by_addr(chan, addr); if (c2a) return c2a; + if (atr->flags & I2C_ATR_F_STATIC) + return NULL; + c2a = i2c_atr_create_mapping_by_addr(chan, addr); if (c2a) return c2a; @@ -545,7 +549,7 @@ static int i2c_atr_attach_addr(struct i2c_adapter *adapter, mutex_lock(&chan->alias_pairs_lock); c2a = i2c_atr_create_mapping_by_addr(chan, addr); - if (!c2a) + if (!c2a && !(atr->flags & I2C_ATR_F_STATIC)) c2a = i2c_atr_replace_mapping_by_addr(chan, addr); if (!c2a) { diff --git a/include/linux/i2c-atr.h b/include/linux/i2c-atr.h index 5082f4dd0e23..5aaab1598084 100644 --- a/include/linux/i2c-atr.h +++ b/include/linux/i2c-atr.h @@ -20,8 +20,15 @@ struct i2c_atr; /** * enum i2c_atr_flags - Flags for an I2C ATR driver + * + * @I2C_ATR_F_STATIC: ATR does not support dynamic mapping, use static mapping. + * Mappings will only be added or removed as a result of + * devices being added or removed from a child bus. + * The ATR pool will have to be big enough to accomodate all + * devices expected to be added to the child buses. */ enum i2c_atr_flags { + I2C_ATR_F_STATIC = BIT(0), }; /**