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[83.233.6.197]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5b01ca55723sm2625636e87.35.2026.07.13.00.20.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 13 Jul 2026 00:20:34 -0700 (PDT) From: Marcus Folkesson Date: Mon, 13 Jul 2026 09:19:58 +0200 Subject: [PATCH v11 2/7] i2c: mux: add idle_state property to i2c_mux_core Precedence: bulk X-Mailing-List: linux-i2c@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260713-i2c-mux-v11-2-72bb8af8ee8c@gmail.com> References: <20260713-i2c-mux-v11-0-72bb8af8ee8c@gmail.com> In-Reply-To: <20260713-i2c-mux-v11-0-72bb8af8ee8c@gmail.com> To: Wolfram Sang , Michael Hennerich , Bartosz Golaszewski , Andi Shyti , Andy Shevchenko , Bartosz Golaszewski , Peter Rosin , Peter Rosin Cc: linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Marcus Folkesson X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=2493; i=marcus.folkesson@gmail.com; h=from:subject:message-id; bh=vnuM7kAv6UZYVTKxBCbKpa+2q5drZUiYDWWf72AF6A4=; b=owEBbQKS/ZANAwAKAYiATm9ZXVIyAcsmYgBqVJG2jUPsQ+B917os5jCn8R16fUEqvn3JkO3eJ spLK8xMh2WJAjMEAAEKAB0WIQQFUaLotmy1TWTBLGWIgE5vWV1SMgUCalSRtgAKCRCIgE5vWV1S MtZxD/9ASSOsNq1O1WXCwFDoTWIHuFHmsrumS2i+YzrgmZvlAUXbOxWVxCXxSPHTayTfPpEvrpf XSTy7kw3jB5fM7qRPi1N5FOp4MfZh4YVyrKnKtq1LDZP+FG336Mb64Un8vMYxZ2SMBYSQZdJBo6 j2ERjEtS0MUZT7rxZlBkW8N5+jLfGqGnxhnP+xOwtVNeuM5GYuJ23esdRstjd7sVyA6NJdhM6na fHGmFomp3OaWL0V8iWXI7rlg5x1bkNUdwZaje0A5zk/2TI4LsBS4O1oJ5yOQuUORp9CRb8dhTAS 2/Gsv/laAx0CIPvAAHVlc1kCaCii5MlZDfNmuSqWqEksEijbS9gTwZQIs2mLC7RIxxpgHNf568g +fi8BqjFL1F9lAWfw/seqUpC37YdLqQOT71e0AbURBbzGfJAhy0sqlTp3bvDsSQPW45ZS5lzRn6 QYEMJB5HXcr8nPaHa608aPj+x0rqdsCfeFBPRLHtBW+3rI1s0VawM0iF1hoqCdDgtiskSjnEUyu mKVOLHQINzOqudtvzWAiTEn1qbfvd0KcjsPF0jy0pbWkec5CubMb+wgOL8pDq57ChHAiBMdr7GO k6Q1D79MPQlDyzAGLVSUe40ypi0CKtUHhYojuOLDOjFTLiNy/uuUPbnSLAnOTgagqgwecOHu5QQ tIxxsRjJpi4YDzg== X-Developer-Key: i=marcus.folkesson@gmail.com; a=openpgp; fpr=AB91D46C7E0F6E6FB2AB640EC0FE25D598F6C127 Muxes treat their channels differently when idle. Let the mux core have this information to make it available for internal use. Reuse the same state values used by CONFIG_MULTIPLEXER. Possible idle states are: - MUX_IDLE_AS_IS: Leave channels as is when idle - MUX_IDLE_DISCONNECT: Disconnect channel (set HiZ when idle) - : Enable channel n when idle Default value is set to MUX_IDLE_AS_IS. Signed-off-by: Marcus Folkesson --- drivers/i2c/i2c-mux.c | 1 + include/linux/i2c-mux.h | 26 ++++++++++++++++++++++++++ 2 files changed, 27 insertions(+) diff --git a/drivers/i2c/i2c-mux.c b/drivers/i2c/i2c-mux.c index 681a201c239b..edf16683dc83 100644 --- a/drivers/i2c/i2c-mux.c +++ b/drivers/i2c/i2c-mux.c @@ -247,6 +247,7 @@ struct i2c_mux_core *i2c_mux_alloc(struct i2c_adapter *parent, muxc->select = select; muxc->deselect = deselect; muxc->max_adapters = max_adapters; + muxc->idle_state = MUX_IDLE_AS_IS; return muxc; } diff --git a/include/linux/i2c-mux.h b/include/linux/i2c-mux.h index 1784ac7afb11..624fadbaa703 100644 --- a/include/linux/i2c-mux.h +++ b/include/linux/i2c-mux.h @@ -13,6 +13,7 @@ #ifdef __KERNEL__ +#include #include struct i2c_mux_core { @@ -22,6 +23,17 @@ struct i2c_mux_core { unsigned int arbitrator:1; unsigned int gate:1; + /* + * The mux controller state to use when inactive. + * Possible idle states are: + * - MUX_IDLE_AS_IS: Leave channels as is when idle + * - MUX_IDLE_DISCONNECT: Disconnect channel (set HiZ when idle) + * - : Enable channel n when idle + * + * Default value is set to MUX_IDLE_AS_IS. + */ + int idle_state; + void *priv; int (*select)(struct i2c_mux_core *, u32 chan_id); @@ -38,6 +50,20 @@ struct i2c_mux_core *i2c_mux_alloc(struct i2c_adapter *parent, int (*select)(struct i2c_mux_core *, u32), int (*deselect)(struct i2c_mux_core *, u32)); +/* + * Mux drivers may only change idle_state, and may only do so + * between allocation and registration of the mux controller. + */ +static inline void i2c_mux_set_idle_state(struct i2c_mux_core *muxc, int state) +{ + muxc->idle_state = state; +} + +static inline int i2c_mux_idle_state(struct i2c_mux_core *muxc) +{ + return muxc->idle_state; +} + /* flags for i2c_mux_alloc */ #define I2C_MUX_LOCKED BIT(0) #define I2C_MUX_ARBITRATOR BIT(1) -- 2.54.0