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Sun, 04 Oct 2026 08:28:23 -0700 (PDT) Message-ID: <162c3908-cbf9-4bf2-8594-8592d5e4c3e5@linaro.org> Date: Sun, 4 Oct 2026 17:28:21 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: Neil Armstrong Reply-To: Neil Armstrong Subject: Re: [RFC PATCH 3/6] net: stmmac: dwmac-meson8b: add support for the Amlogic T7 To: Lucas Tanure , xianwei.zhao@amlogic.com, Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Kevin Hilman , Jerome Brunet , Martin Blumenstingl , Maxime Chevallier , Maxime Coquelin , Alexandre Torgue Cc: netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com References: <20261004144046.391444-1-tanure@linux.com> <20261004144046.391444-4-tanure@linux.com> Content-Language: en-US, fr Autocrypt: addr=neil.armstrong@linaro.org; keydata= xsBNBE1ZBs8BCAD78xVLsXPwV/2qQx2FaO/7mhWL0Qodw8UcQJnkrWmgTFRobtTWxuRx8WWP GTjuhvbleoQ5Cxjr+v+1ARGCH46MxFP5DwauzPekwJUD5QKZlaw/bURTLmS2id5wWi3lqVH4 BVF2WzvGyyeV1o4RTCYDnZ9VLLylJ9bneEaIs/7cjCEbipGGFlfIML3sfqnIvMAxIMZrvcl9 qPV2k+KQ7q+aXavU5W+yLNn7QtXUB530Zlk/d2ETgzQ5FLYYnUDAaRl+8JUTjc0CNOTpCeik 80TZcE6f8M76Xa6yU8VcNko94Ck7iB4vj70q76P/J7kt98hklrr85/3NU3oti3nrIHmHABEB AAHNKk5laWwgQXJtc3Ryb25nIDxuZWlsLmFybXN0cm9uZ0BsaW5hcm8ub3JnPsLAkQQTAQoA OwIbIwULCQgHAwUVCgkICwUWAgMBAAIeAQIXgBYhBInsPQWERiF0UPIoSBaat7Gkz/iuBQJk Q5wSAhkBAAoJEBaat7Gkz/iuyhMIANiD94qDtUTJRfEW6GwXmtKWwl/mvqQtaTtZID2dos04 YqBbshiJbejgVJjy+HODcNUIKBB3PSLaln4ltdsV73SBcwUNdzebfKspAQunCM22Mn6FBIxQ GizsMLcP/0FX4en9NaKGfK6ZdKK6kN1GR9YffMJd2P08EO8mHowmSRe/ExAODhAs9W7XXExw UNCY4pVJyRPpEhv373vvff60bHxc1k/FF9WaPscMt7hlkbFLUs85kHtQAmr8pV5Hy9ezsSRa GzJmiVclkPc2BY592IGBXRDQ38urXeM4nfhhvqA50b/nAEXc6FzqgXqDkEIwR66/Gbp0t3+r yQzpKRyQif3OwE0ETVkGzwEIALyKDN/OGURaHBVzwjgYq+ZtifvekdrSNl8TIDH8g1xicBYp QTbPn6bbSZbdvfeQPNCcD4/EhXZuhQXMcoJsQQQnO4vwVULmPGgtGf8PVc7dxKOeta+qUh6+ SRh3vIcAUFHDT3f/Zdspz+e2E0hPV2hiSvICLk11qO6cyJE13zeNFoeY3ggrKY+IzbFomIZY 4yG6xI99NIPEVE9lNBXBKIlewIyVlkOaYvJWSV+p5gdJXOvScNN1epm5YHmf9aE2ZjnqZGoM Mtsyw18YoX9BqMFInxqYQQ3j/HpVgTSvmo5ea5qQDDUaCsaTf8UeDcwYOtgI8iL4oHcsGtUX oUk33HEAEQEAAcLAXwQYAQIACQUCTVkGzwIbDAAKCRAWmrexpM/4rrXiB/sGbkQ6itMrAIfn M7IbRuiSZS1unlySUVYu3SD6YBYnNi3G5EpbwfBNuT3H8//rVvtOFK4OD8cRYkxXRQmTvqa3 3eDIHu/zr1HMKErm+2SD6PO9umRef8V82o2oaCLvf4WeIssFjwB0b6a12opuRP7yo3E3gTCS KmbUuLv1CtxKQF+fUV1cVaTPMyT25Od+RC1K+iOR0F54oUJvJeq7fUzbn/KdlhA8XPGzwGRy 4zcsPWvwnXgfe5tk680fEKZVwOZKIEuJC3v+/yZpQzDvGYJvbyix0lHnrCzq43WefRHI5XTT QbM0WUIBIcGmq38+OgUsMYu4NzLu7uZFAcmp6h8g Organization: Linaro In-Reply-To: <20261004144046.391444-4-tanure@linux.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 10/4/26 16:40, Lucas Tanure wrote: > The glue registers on the T7 are laid out exactly as the G12A ones, RX > delay field included, so the T7 can reuse the G12A settings. > > What the T7 does not share is how the controller reaches DRAM: the bus > path goes through a pipeline stage with a gate of its own, and no device > other than the controller has any use for that gate. Claim it and hold > it enabled for as long as the controller is bound, otherwise it is > switched off as unused and a transfer that has been started can never > complete. > > Give the T7 match data of its own so that only it looks the clock up, > and require the clock instead of treating it as optional: the controller > cannot do DMA without it, and failing the probe with a clear message > beats booting and hitting an undiagnosable hang later. > > Assisted-by: LLM > Signed-off-by: Lucas Tanure > --- > .../ethernet/stmicro/stmmac/dwmac-meson8b.c | 19 +++++++++++++++++++ > 1 file changed, 19 insertions(+) > > diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c > index e4d5c41294f4..450f7b4b29a6 100644 > --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c > +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c > @@ -81,6 +81,7 @@ struct meson8b_dwmac; > struct meson8b_dwmac_data { > int (*set_phy_mode)(struct meson8b_dwmac *dwmac); > bool has_prg_eth1_rgmii_rx_delay; > + bool has_pipeline_clk; > }; > > struct meson8b_dwmac { > @@ -384,6 +385,7 @@ static int meson8b_dwmac_probe(struct platform_device *pdev) > struct plat_stmmacenet_data *plat_dat; > struct stmmac_resources stmmac_res; > struct meson8b_dwmac *dwmac; > + struct clk *pipeline_clk; > int ret; > > ret = stmmac_get_platform_resources(pdev, &stmmac_res); > @@ -443,6 +445,13 @@ static int meson8b_dwmac_probe(struct platform_device *pdev) > if (IS_ERR(dwmac->timing_adj_clk)) > return PTR_ERR(dwmac->timing_adj_clk); > > + if (dwmac->data->has_pipeline_clk) { > + pipeline_clk = devm_clk_get_enabled(dwmac->dev, "pipeline"); > + if (IS_ERR(pipeline_clk)) > + return dev_err_probe(dwmac->dev, PTR_ERR(pipeline_clk), > + "missing pipeline clock\n"); > + } > + > ret = meson8b_init_rgmii_delays(dwmac); > if (ret) > return ret; > @@ -479,6 +488,12 @@ static const struct meson8b_dwmac_data meson_g12a_dwmac_data = { > .has_prg_eth1_rgmii_rx_delay = true, > }; > > +static const struct meson8b_dwmac_data meson_t7_dwmac_data = { > + .set_phy_mode = meson_axg_set_phy_mode, > + .has_prg_eth1_rgmii_rx_delay = true, > + .has_pipeline_clk = true, > +}; > + > static const struct of_device_id meson8b_dwmac_match[] = { > { > .compatible = "amlogic,meson8b-dwmac", > @@ -500,6 +515,10 @@ static const struct of_device_id meson8b_dwmac_match[] = { > .compatible = "amlogic,meson-g12a-dwmac", > .data = &meson_g12a_dwmac_data, > }, > + { > + .compatible = "amlogic,t7-dwmac", > + .data = &meson_t7_dwmac_data, > + }, > { } > }; > MODULE_DEVICE_TABLE(of, meson8b_dwmac_match); Reviewed-by: Neil Armstrong Thanks, Neil