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Wed, 23 Sep 2026 05:37:12 -0700 (PDT) Date: Wed, 23 Sep 2026 18:07:01 +0530 From: Mohd Ayaan Anwar To: Andrew Lunn Cc: Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Serge Semin , Heiner Kallweit , Russell King , Richard Cochran , Bjorn Andersson , Konrad Dybcio , Alexandre Torgue , Giuseppe Cavallaro , Jose Abreu , Maxime Chevallier , Maxime Coquelin , netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, Lorenzo Bianconi , Shawn Guo , Zhangfei Gao , Jitendra Vegiraju Subject: Re: [PATCH RFC net-next 3/9] net: pcs: xpcs: add custom platform register accessors Message-ID: References: <20260923-qcom_xpcs_nord_emac-v1-0-4b1c682af70f@oss.qualcomm.com> <20260923-qcom_xpcs_nord_emac-v1-3-4b1c682af70f@oss.qualcomm.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTIzMDA1MCBTYWx0ZWRfX7Q3D6a5C+1fm HKnXK4+6LXqoFsaCG6RgORrUoKxfpM8NTHCez/UVdWdzyATgvFdiJ96QWfUcYCtP+rgl9zr2a3K FnCjFr+32AnfPk7DndwngQQ2SLH0TyTBeSmREUUO5zqkDDzlfuf8nqIb1xu73gH4w2DeVGBqGLa ORRSBJi34Hy63sY8GwQIWq26R+iyj0pkAYvkTTdKlaxGckoargad3YxHdRdyVBt23iJT5L2MTvp u+lHSUAB1bnZhwIW4VtkMGt4pKHd1pjJZ/XWIPM9xkfn6ztjIp1KaQ7/mrk8T5I5h+nzRGUxkNh 0f/bTPSyf4MCfdYcNllOk6nas//3XBNadfOOugmg2d51H5cE2QYtGjoKnd0RjdSMsWXsGvR1/5m F8YVN5DASe3twIoFzz2C2A120ZrQpGnlwKDXMQSJGLLV2yrpf26ynVn6k8wPqIRQW6X4gttmTHS 2le3zBV1imVCaA8ldPw== X-Authority-Analysis: v=2.4 cv=HfuB3SE8 c=1 sm=1 tr=0 ts=6ab3c7fa cx=c_pps a=oF/VQ+ItUULfLr/lQ2/icg==:117 a=ZePRamnt/+rB5gQjfz0u9A==:17 a=kj9zAlcOel0A:10 a=VdqzKS8jKosA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=ZpdpYltYx_vBUK5n70dp:22 a=B2OTbEDsPxpMJ7_uHOkA:9 a=CjuIK1q_8ugA:10 a=3WC7DwWrALyhR5TkjVHa:22 X-Proofpoint-GUID: yngOFalgejRNxNAvEHedGxNUOx92Brtx X-Proofpoint-Spam-Info: AW1haW4tMjYwOTIzMDA1MCBTYWx0ZWRfX6AqPGCYcP7va YKFiU5kKJ10aM/9qMoUzY/lz1wP8sTtFQLWz/SKQFGyKutRepVZqkNB8iZ6rVeDxEJIUQ2O715o SxpVps0DAS/6na2BIWnygX69scCsSik= X-Proofpoint-ORIG-GUID: yngOFalgejRNxNAvEHedGxNUOx92Brtx X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-23_04,2026-09-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 impostorscore=0 suspectscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 bulkscore=0 adultscore=0 priorityscore=1501 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609230050 On Wed, Sep 23, 2026 at 02:18:17PM +0200, Andrew Lunn wrote: > On Wed, Sep 23, 2026 at 06:37:29AM +0530, Mohd Ayaan Anwar wrote: > > + if (pxpcs->ops) > > + return pxpcs->ops->reg_read(pxpcs->pdev, pxpcs->reg_base, > > + MDIO_MMD_VEND2, reg); > > + > > if (pxpcs->reg_indir) > > return xpcs_mmio_read_reg_indirect(pxpcs, MDIO_MMD_VEND2, reg); > > else > > Ugly. > > How about changing pxpcs->reg_indir to an enum, with values indirect, direct. > > One patch. > > Then look at > > res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "direct") ?: > platform_get_resource_byname(pdev, IORESOURCE_MEM, "indirect"); > if (!res) { > dev_err(dev, "No reg-space found\n"); > return -EINVAL; > } > > if (!strcmp(res->name, "indirect")) > pxpcs->reg_indir = true; > > if (pxpcs->reg_indir) > spc_size = pxpcs->reg_width * SZ_256; > else > spc_size = pxpcs->reg_width * SZ_2M; > > Look how easy it is to cleanly extend this with a new resource name? > And add accessors using the funky mapping your device has. Another > patch. > That's a better idea. I was debating whether using pcs-xpcs-plat.c with this HW was a good idea, but what you are proposing should hide away the ugliness. Thank you for the suggestion. Ayaan