linux-kernel - Re: [PATCH] i2c: hibvt: add Hisilicon BVT I2C controller driver

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Message-ID: <20160622102509.GD25837@leverpostej>
Date:	Wed, 22 Jun 2016 11:25:10 +0100
From:	Mark Rutland <mark.rutland@....com>
To:	Pan Wen <wenpan@...ilicon.com>
Cc:	wsa@...-dreams.de, robh+dt@...nel.org, linux-i2c@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	howell.yang@...ilicon.com, xuejiancheng@...ilicon.com
Subject: Re: [PATCH] i2c: hibvt: add Hisilicon BVT I2C controller driver

On Wed, Jun 22, 2016 at 04:55:26PM +0800, Pan Wen wrote:
> add Hisilicon BVT I2C controller driver support.
> 
> Signed-off-by: Pan Wen <wenpan@...ilicon.com>
> ---
>  .../devicetree/bindings/i2c/i2c-hibvt.txt          |  24 +
>  drivers/i2c/busses/Kconfig                         |  10 +
>  drivers/i2c/busses/Makefile                        |   1 +
>  drivers/i2c/busses/i2c-hibvt.c                     | 736 +++++++++++++++++++++
>  4 files changed, 771 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/i2c/i2c-hibvt.txt
>  create mode 100644 drivers/i2c/busses/i2c-hibvt.c
> 
> diff --git a/Documentation/devicetree/bindings/i2c/i2c-hibvt.txt b/Documentation/devicetree/bindings/i2c/i2c-hibvt.txt
> new file mode 100644
> index 0000000..3aa2cee
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/i2c/i2c-hibvt.txt
> @@ -0,0 +1,24 @@
> +Hisilicon BVT I2C master controller
> +
> +Required properties:
> +- compatible: should be "hisilicon,hibvt-i2c".
> +- reg: physical base address of the controller and length of memory mapped.
> +     region.
> +- interrupts: interrupt number to the cpu.
> +- clocks: phandles to input clocks.
> +
> +Optional properties:
> +- clock-frequency: Desired I2C bus frequency in Hz, otherwise defaults to 100000.
> +
> +Other properties:
> +see Documentation/devicetree/bindings/i2c/i2c.txt.
> +
> +Examples:
> +i2c_bus0: i2c@...10000 {
> +	compatible = "hisilicon,hibvt-i2c";
> +	reg = <0x12110000 0x100>;
> +	interrupts = <20>;
> +	clocks = <&crg_ctrl HI3516CV300_APB_CLK>;
> +	clock-names = "apb_pclk";
> +	clock-frequency = <100000>;
> +};

The clock-names property was not described above, and the driver doesn't
appear to use it.

Please explciitly describe the clock-names you expect, and use them in
the driver. If there is a single clock, then you can simply drop the
clock-names property from the example.

Thanks,
Mark.

> +	i2c->clk = devm_clk_get(&pdev->dev, NULL);
> +	if (IS_ERR(i2c->clk)) {
> +		dev_err(i2c->dev, "cannot get clock\n");
> +		return -ENOENT;
> +	}
> +	clk_prepare_enable(i2c->clk);