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[83.233.6.197]) by smtp.gmail.com with ESMTPSA id 38308e7fff4ca-361a99e99e6sm26982661fa.56.2025.09.21.23.21.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 21 Sep 2025 23:21:48 -0700 (PDT) From: Marcus Folkesson Date: Mon, 22 Sep 2025 08:21:01 +0200 Subject: [PATCH RFC 6/7] i2c: davinci: add support for setting bus frequency Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250922-i2c-mux-v1-6-28c94a610930@gmail.com> References: <20250922-i2c-mux-v1-0-28c94a610930@gmail.com> In-Reply-To: <20250922-i2c-mux-v1-0-28c94a610930@gmail.com> To: Wolfram Sang , Peter Rosin , Michael Hennerich , Bartosz Golaszewski , Andi Shyti Cc: linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Marcus Folkesson X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1607; i=marcus.folkesson@gmail.com; h=from:subject:message-id; bh=ZRFvSmAGP6q+vBY0PuMHuuVxT+alZd4ni1G4olWQ04c=; b=owEBbQKS/ZANAwAKAYiATm9ZXVIyAcsmYgBo0OrnD0paauU8/1PUKU/MWNI4rWluhwYS4jfbi KOJB16EP9+JAjMEAAEKAB0WIQQFUaLotmy1TWTBLGWIgE5vWV1SMgUCaNDq5wAKCRCIgE5vWV1S Mgp3D/9Cz7yhGXhmLHWthsXVuKYbL0YxQVy1e8U724NkO8lZES31r9eFAf692OBdoIcKJ4S43HX fmkgWg1lbJLADJ380iZdDVt9jzTj3SJZ+jhjwPbNnOFPqQpQ0WQuzCiXmjyfQQwt76bSsxwoWE8 7NrytWx4w4y0dxGrtQX3A3VFX5kJNOlpfHNtKwAm46T9L3PIBkuyD4fPH4+JOb1nOV3+CVKNVia LpS54IMFKNyXua00Iq7dqhEMYrZ/BECI3ygwKXJBXrN/hv6FCUQTnWM0UcUnaUTHzfbW9ziUvju OgtMe/o2nqSyGjhfAkpQ7LdCfkCccxdN9sazjhZWc3M8YSS0TstSc1MuwuhyXVHi/YHE6Yb4IdU KV23LyBnyMkGaxKwAHCw3j+gizljEDhcmNv1T6micBVKLhqmoLOLid3eJH8Kk/ylH2ejmemIbMS Fq1WAZfTw1cqWBWgUlO7q4VWuDqAZsfg2ZxG87lfcpu2n6orpniH+Gi8Gb8Cs4w/cWVF5g6hR3y uJj52cFUqy4+ctxslVzxti0dxWVdslFvnYKzUjugX5dCYSz2xo3rT/emfFU68W1eTkf6dlQA9WN jxIfCoibU1rNARox5JK+m6wwnbXDgxEUKFLyZgvVOg4AjcIo54pAyLmjQn64jqkIjAMzgxcLXq1 JX0MkjYuPwatmwA== X-Developer-Key: i=marcus.folkesson@gmail.com; a=openpgp; fpr=AB91D46C7E0F6E6FB2AB640EC0FE25D598F6C127 Populate adapter with clock_hz and set_clk_freq to enable support for dynamic bus frequency. Signed-off-by: Marcus Folkesson Acked-by: Bartosz Golaszewski --- drivers/i2c/busses/i2c-davinci.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/drivers/i2c/busses/i2c-davinci.c b/drivers/i2c/busses/i2c-davi= nci.c index 6b18938457d0c5cabc323c364d9330c2890df107..d3e47738f8ee7e8f69fee49509d= cda396c9b7fb6 100644 --- a/drivers/i2c/busses/i2c-davinci.c +++ b/drivers/i2c/busses/i2c-davinci.c @@ -279,6 +279,27 @@ static int i2c_davinci_init(struct davinci_i2c_dev *de= v) return 0; } =20 +static int davinci_i2c_set_clk(struct i2c_adapter *adap, u32 clock_hz) +{ + struct davinci_i2c_dev *dev =3D i2c_get_adapdata(adap); + + if (dev->bus_freq =3D=3D clock_hz) + return 0; + + dev->bus_freq =3D clock_hz; + + /* put I2C into reset */ + davinci_i2c_reset_ctrl(dev, 0); + + /* compute clock dividers */ + i2c_davinci_calc_clk_dividers(dev); + + /* Take the I2C module out of reset: */ + davinci_i2c_reset_ctrl(dev, 1); + + return 0; +} + /* * This routine does i2c bus recovery by using i2c_generic_scl_recovery * which is provided by I2C Bus recovery infrastructure. @@ -810,6 +831,8 @@ static int davinci_i2c_probe(struct platform_device *pd= ev) adap->dev.parent =3D &pdev->dev; adap->timeout =3D DAVINCI_I2C_TIMEOUT; adap->dev.of_node =3D dev_of_node(&pdev->dev); + adap->clock_hz =3D dev->bus_freq; + adap->set_clk_freq =3D davinci_i2c_set_clk; =20 if (dev->has_pfunc) adap->bus_recovery_info =3D &davinci_i2c_scl_recovery_info; --=20 2.50.1