linux-kernel - Re: [PATCH v2 1/3] dt-bindings: media: i2c: Add IMX290 CMOS sensor binding

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Message-ID: <20190813113846.GG13294@shell.armlinux.org.uk>
Date:   Tue, 13 Aug 2019 12:38:46 +0100
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     mchehab@...nel.org, robh+dt@...nel.org, devicetree@...r.kernel.org,
        c.barrett@...mos.com, linux-kernel@...r.kernel.org,
        a.brela@...mos.com, linux-arm-kernel@...ts.infradead.org,
        linux-media@...r.kernel.org
Subject: Re: [PATCH v2 1/3] dt-bindings: media: i2c: Add IMX290 CMOS sensor
 binding

On Tue, Aug 06, 2019 at 06:39:36PM +0530, Manivannan Sadhasivam wrote:
> +Required Properties:
> +- compatible: Should be "sony,imx290"
> +- reg: I2C bus address of the device
> +- clocks: Reference to the xclk clock.
> +- clock-names: Should be "xclk".
> +- clock-frequency: Frequency of the xclk clock.

Driver code:

+       ret = of_property_read_u32(dev->of_node, "clock-frequency", &xclk_freq);+       if (ret) {
+               dev_err(dev, "Could not get xclk frequency\n");
+               return ret;
+       }
+
+       /* external clock must be 37.125 MHz */
+       if (xclk_freq != 37125000) {
+               dev_err(dev, "External clock frequency %u is not supported\n",
+                       xclk_freq);
+               return -EINVAL;
+       }

So, only 37125000 is supported - is that not worth mentioning in this
description?  Is this a hard requirement of the sensor?  If so, why
does it need to be mentioned in the DT binding?

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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