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[66.90.144.107]) by smtp.gmail.com with ESMTPSA id t17-20020a9d7f91000000b005c925454e6fsm9996868otp.69.2022.03.23.06.11.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 23 Mar 2022 06:11:51 -0700 (PDT) Received: (nullmailer pid 3935370 invoked by uid 1000); Wed, 23 Mar 2022 13:11:49 -0000 Date: Wed, 23 Mar 2022 08:11:49 -0500 From: Rob Herring To: Sui Jingfeng <15330273260@189.cn> Cc: Maxime Ripard , Thomas Zimmermann , Roland Scheidegger , Zack Rusin , Christian Gmeiner , David Airlie , Daniel Vetter , Thomas Bogendoerfer , Dan Carpenter , Krzysztof Kozlowski , Andrey Zhizhikin , Sam Ravnborg , "David S . Miller" , Jiaxun Yang , Lucas Stach , Maarten Lankhorst , Ilia Mirkin , Qing Zhang , suijingfeng , linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org, kernel test robot Subject: Re: [PATCH v11 7/7] drm/lsdc: add drm driver for loongson display controller Message-ID: References: <20220321162916.1116541-1-15330273260@189.cn> <20220321162916.1116541-8-15330273260@189.cn> <9ea4d326-ad5f-4f2c-1609-4ca772699d1b@189.cn> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <9ea4d326-ad5f-4f2c-1609-4ca772699d1b@189.cn> Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org On Wed, Mar 23, 2022 at 12:12:43PM +0800, Sui Jingfeng wrote: > > On 2022/3/23 04:49, Rob Herring wrote: > > > +/* > > > + * mainly for dc in ls7a1000 which have builtin gpio emulated i2c > > > + * > > > + * @index : output channel index, 0 for DVO0, 1 for DVO1 > > > + */ > > > +struct lsdc_i2c *lsdc_create_i2c_chan(struct device *dev, void *base, unsigned int index) > > > +{ > > > + char compat[32] = {0}; > > > + unsigned int udelay = 5; > > > + unsigned int timeout = 2200; > > > + int nr = -1; > > > + struct i2c_adapter *adapter; > > > + struct lsdc_i2c *li2c; > > > + struct device_node *i2c_np; > > > + int ret; > > > + > > > + li2c = devm_kzalloc(dev, sizeof(*li2c), GFP_KERNEL); > > > + if (!li2c) > > > + return ERR_PTR(-ENOMEM); > > > + > > > + li2c->index = index; > > > + li2c->dev = dev; > > > + > > > + if (index == 0) { > > > + li2c->sda = 0x01; > > > + li2c->scl = 0x02; > > > + } else if (index == 1) { > > > + li2c->sda = 0x04; > > > + li2c->scl = 0x08; > > Just require this to be in DT rather than having some default. > > > By design,  I am try very hard to let the code NOT fully  DT dependent. DT is nice , easy to learn and use. > But kernel side developer plan to follow UEFI + ACPI Specification on LS3A5000 + LS7A1000 platform. See [1] > There will no DT support then, provide a convention support  make the driver more flexible. I want the > driver works with minimal requirement. The driver just works on simple boards by put the following dc device > node in arch/mips/dts/loongson/loongson64g_4core_ls7a.dts, Pick DT or ACPI for the platform, not both. We don't need to have both in the kernel to support. Rob