[U-Boot] [PATCH v2] i2c: mxc: add CONFIG_CLK support

[Heiko Schocher]

Hello Peng,

Am 27.08.2019 um 11:55 schrieb Peng Fan:
> Hi Heiko,
> 
>> Subject: [PATCH v2] i2c: mxc: add CONFIG_CLK support
> 
> Would you pick up this patch?

Huh, seems I missed this patch ... now it is in my patchwork ToDo
list... patch looks good to me.... so:

If Stefano has no objections I can pick it up for 2019.10

bye,
Heiko
> 
> Thanks,
> Peng.
> 
>>
>> When CONFIG_CLK enabled, use CLK UCLASS for clk related settings.
>>
>> Signed-off-by: Peng Fan <peng.fan at nxp.com>
>> ---
>>
>> V2:
>>   use clk_get_rate when getting i2c per clk rate with CLK UCLASS
>>
>>   arch/arm/include/asm/mach-imx/mxc_i2c.h |  6 ++++++
>>   drivers/i2c/mxc_i2c.c                   | 22
>> ++++++++++++++++++++++
>>   2 files changed, 28 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..8d6b4650ff 100644
>> --- a/drivers/i2c/mxc_i2c.c
>> +++ b/drivers/i2c/mxc_i2c.c
>> @@ -149,7 +149,12 @@ 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;
>> @@ -890,9 +895,22 @@ 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 +937,11 @@ 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;
>>   	}
>>
>> --
>> 2.16.4
> 

-- 
DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: +49-8142-66989-52   Fax: +49-8142-66989-80   Email: hs at denx.de