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[2a02:3100:b2e2:2001:c47f:5a89:3d9a:cd2d]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-48b380fab11sm10937712f8f.16.2026.10.03.01.28.46 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Sat, 03 Oct 2026 01:28:46 -0700 (PDT) From: Karl Mehltretter To: Yoshinori Sato , Rich Felker Cc: Karl Mehltretter , John Paul Adrian Glaubitz , linux-sh@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] sh: sh7785lcr: register the PCA9564 as I2C bus 0 Date: Sat, 3 Oct 2026 10:28:33 +0200 Message-Id: <20261003082833.21511-1-kmehltretter@gmail.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The R2025S/D board information is registered on I2C bus 0. Commit 44454baa7ca7 ("i2c: Dynamically assign adapter id if it wasn't explictly specified") changed the PCA9564 platform driver to pass negative platform device IDs to the I2C core. The SH7785LCR device uses ID -1, so the core assigns it a dynamic bus number. Reserving bus 0 for the board information makes i2c-1 the first dynamic bus, and the RTC is never instantiated. Set the platform device ID to 0 so the adapter is registered as i2c-0 and the RTC board information matches it. Fixes: 44454baa7ca7 ("i2c: Dynamically assign adapter id if it wasn't explictly specified") Assisted-by: LLM Signed-off-by: Karl Mehltretter --- Tested with 29-bit and 32-bit kernels on a custom QEMU model of the SH7785LCR. Both registered the controller as i2c-0 and the R2025S/D as rtc0. Testing on real hardware is welcome. arch/sh/boards/board-sh7785lcr.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/sh/boards/board-sh7785lcr.c b/arch/sh/boards/board-sh7785lcr.c index 25c4968f0d8b..b93423df582f 100644 --- a/arch/sh/boards/board-sh7785lcr.c +++ b/arch/sh/boards/board-sh7785lcr.c @@ -256,7 +256,7 @@ static struct i2c_pca9564_pf_platform_data i2c_platform_data = { static struct platform_device i2c_device = { .name = "i2c-pca-platform", - .id = -1, + .id = 0, .dev = { .platform_data = &i2c_platform_data, }, -- 2.53.0