[U-Boot] [PATCH] i2c: mxc: add CONFIG_CLK support

[Schrempf Frieder]

Hi Peng,

On 06.08.19 12:09, Peng Fan wrote:
> When CONFIG_CLK enabled, use CLK UCLASS for clk related settings.
> 
> Signed-off-by: Peng Fan <peng.fan at nxp.com>
> ---
>   arch/arm/include/asm/mach-imx/mxc_i2c.h |  6 ++++++
>   drivers/i2c/mxc_i2c.c                   | 17 +++++++++++++++++
>   2 files changed, 23 insertions(+)
> 
> diff --git a/arch/arm/include/asm/mach-imx/mxc_i2c.h b/arch/arm/include/asm/mach-imx/mxc_i2c.h
> index 8e1ea9af19..81fd981444 100644
> --- a/arch/arm/include/asm/mach-imx/mxc_i2c.h
> +++ b/arch/arm/include/asm/mach-imx/mxc_i2c.h
> @@ -6,6 +6,9 @@
>   #define __ASM_ARCH_MXC_MXC_I2C_H__
>   #include <asm-generic/gpio.h>
>   #include <asm/mach-imx/iomux-v3.h>
> +#if CONFIG_IS_ENABLED(CLK)
> +#include <clk.h>
> +#endif
>   
>   struct i2c_pin_ctrl {
>   	iomux_v3_cfg_t i2c_mode;
> @@ -47,6 +50,9 @@ struct mxc_i2c_bus {
>   	ulong driver_data;
>   	int speed;
>   	struct i2c_pads_info *pads_info;
> +#if CONFIG_IS_ENABLED(CLK)
> +	struct clk per_clk;
> +#endif
>   #ifndef CONFIG_DM_I2C
>   	int (*idle_bus_fn)(void *p);
>   	void *idle_bus_data;
> diff --git a/drivers/i2c/mxc_i2c.c b/drivers/i2c/mxc_i2c.c
> index 23119cce65..2e157bca58 100644
> --- a/drivers/i2c/mxc_i2c.c
> +++ b/drivers/i2c/mxc_i2c.c

I already commented on a previous version of this patch and the 
following change is still missing here:

@@ -149,7 +149,11 @@ static uint8_t i2c_imx_get_clk(struct mxc_i2c_bus 
*i2c_bus, unsigned int rate)
  #endif

         /* Divider value calculation */
+#if CONFIG_IS_ENABLED(CLK)
+       i2c_clk_rate = clk_get_rate(&i2c_bus->per_clk);
+#else
         i2c_clk_rate = mxc_get_clock(MXC_I2C_CLK);
+#endif
         div = (i2c_clk_rate + rate - 1) / rate;
         if (div < i2c_clk_div[0][0])
                 clk_div = 0;

Regards,
Frieder

> @@ -890,9 +890,22 @@ static int mxc_i2c_probe(struct udevice *bus)
>   	i2c_bus->bus = bus;
>   
>   	/* Enable clk */
> +#if CONFIG_IS_ENABLED(CLK)
> +	ret = clk_get_by_index(bus, 0, &i2c_bus->per_clk);
> +	if (ret) {
> +		printf("Failed to get i2c clk\n");
> +		return ret;
> +	}
> +	ret = clk_enable(&i2c_bus->per_clk);
> +	if (ret) {
> +		printf("Failed to enable i2c clk\n");
> +		return ret;
> +	}
> +#else
>   	ret = enable_i2c_clk(1, bus->seq);
>   	if (ret < 0)
>   		return ret;
> +#endif
>   
>   	/*
>   	 * See Documentation/devicetree/bindings/i2c/i2c-imx.txt
> @@ -919,7 +932,11 @@ static int mxc_i2c_probe(struct udevice *bus)
>   	ret = i2c_idle_bus(i2c_bus);
>   	if (ret < 0) {
>   		/* Disable clk */
> +#if CONFIG_IS_ENABLED(CLK)
> +		clk_disable(&i2c_bus->per_clk);
> +#else
>   		enable_i2c_clk(0, bus->seq);
> +#endif
>   		return ret;
>   	}
>   
>