Subject: [PATCH] ASoC: rockchip: i2s: configure the sdio pins' iomux mode

From: [email-masked] (sugar)
Date: Mon, 11 Apr 2016 09:18:40 +0800

Hi Heiko,

Got it, thanks for your advice, these will be done in next version.

On 4/9/2016 01:14, Heiko Stuebner Wrote:
> Hi,
>
> Am Mittwoch, 6. April 2016, 16:38:22 schrieb Sugar Zhang:
>> There are 3 i2s sdio pins, which iomux mode is as follows:
>>
>>   - sdi3_sdo1
>>   - sdi2_sdo2
>>   - sdi1_sdo3
>>
>> we need to configure these pins' iomux mode via the GRF register
>> when use multi channel playback/capture.
>>
>> Signed-off-by: Sugar Zhang <[email-masked]>
>> ---
>>
>>   .../devicetree/bindings/sound/rockchip-i2s.txt     |  5 +++
>>   sound/soc/rockchip/rockchip_i2s.c                  | 39
>> +++++++++++++++++++++- sound/soc/rockchip/rockchip_i2s.h
>> |  8 +++++
>>   3 files changed, 51 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/devicetree/bindings/sound/rockchip-i2s.txt
>> b/Documentation/devicetree/bindings/sound/rockchip-i2s.txt index
>> 6e86d8a..ad72a7d 100644
>> --- a/Documentation/devicetree/bindings/sound/rockchip-i2s.txt
>> +++ b/Documentation/devicetree/bindings/sound/rockchip-i2s.txt
>> @@ -23,6 +23,11 @@ Required properties:
>>   - rockchip,playback-channels: max playback channels, if not set, 8
>> channels default. - rockchip,capture-channels: max capture channels, if
>> not set, 2 channels default.
>>
>> +Required properties for controller which support multi channels
>> playback/capture: +
>> +- rockchip,grf: Should be phandle/offset pair. the phandle of the syscon
>> node for GRF register, +  and the offset of the GRF for control register.
>
> I think I'd like it more to use the generic grf-binding we always use
> everwhere else (just the phandle without any offset) and keep the actual
> offset in the driver on a per-soc basis.
>
> That way rockchip,grf stays consistent over all users.
>
> We already have the per-soc compatible values, so it should a easy to add a
> .data element with the necessary offset-information.
>
>> +
>>   Example for rk3288 I2S controller:
>>
>>   i2s at ff890000 {
>> diff --git a/sound/soc/rockchip/rockchip_i2s.c
>> b/sound/soc/rockchip/rockchip_i2s.c index 2f8e204..bc72780 100644
>> --- a/sound/soc/rockchip/rockchip_i2s.c
>> +++ b/sound/soc/rockchip/rockchip_i2s.c
>
> [...]
>
>> @@ -478,6 +504,18 @@ static int rockchip_i2s_probe(struct platform_device
>> *pdev) return -ENOMEM;
>>   	}
>>
>> +	i2s->dev = &pdev->dev;
>> +
>> +	i2s->grf = syscon_regmap_lookup_by_phandle(node, "rockchip,grf");
>> +	if (!IS_ERR(i2s->grf)) {
>> +		ret = of_property_read_u32_index(node, "rockchip,grf",
>> +						 1, &i2s->iocfg_reg);
>> +		if (ret) {
>> +			dev_err(&pdev->dev, "Can't get iocfg_reg offset\n");
>> +			return ret;
>> +		}
>> +	}
>> +
>
> as said in the binding part, please use the generic grf handling and get the
> io-offset from per-soc devicetree data in the driver itself.
>
>
>>   	/* try to prepare related clocks */
>>   	i2s->hclk = devm_clk_get(&pdev->dev, "i2s_hclk");
>>   	if (IS_ERR(i2s->hclk)) {
>> @@ -517,7 +555,6 @@ static int rockchip_i2s_probe(struct platform_device
>> *pdev) i2s->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
>> i2s->capture_dma_data.maxburst = 4;
>>
>> -	i2s->dev = &pdev->dev;
>>   	dev_set_drvdata(&pdev->dev, i2s);
>>
>>   	pm_runtime_enable(&pdev->dev);
>> diff --git a/sound/soc/rockchip/rockchip_i2s.h
>> b/sound/soc/rockchip/rockchip_i2s.h index dc6e2c7..9a6aabf 100644
>> --- a/sound/soc/rockchip/rockchip_i2s.h
>> +++ b/sound/soc/rockchip/rockchip_i2s.h
>> @@ -236,4 +236,12 @@ enum {
>>   #define I2S_TXDR	(0x0024)
>>   #define I2S_RXDR	(0x0028)
>>
>> +/* io direction cfg register */
>> +#define I2S_IO_DIRECTION_SHIFT	11
>
> this setting is sitting in GRF_SOC_CON8 on the rk3399. That is part of the
> very volatile register set where settings move around a lot for each soc.
>
> So if we're having the io-offset in per-soc data, we can easily put the
> shift into it as well.
>
>> +#define I2S_IO_DIRECTION_MASK	(7 << I2S_IO_DIRECTION_SHIFT)
>> +#define I2S_IO_8CH_OUT_2CH_IN	(0 << I2S_IO_DIRECTION_SHIFT)
>> +#define I2S_IO_6CH_OUT_4CH_IN	(1 << I2S_IO_DIRECTION_SHIFT)
>> +#define I2S_IO_4CH_OUT_6CH_IN	(3 << I2S_IO_DIRECTION_SHIFT)
>> +#define I2S_IO_2CH_OUT_8CH_IN	(7 << I2S_IO_DIRECTION_SHIFT)
>
> Keep the settings without the shift here and do the shift dynamically with
> the per-soc setting when changing the setting.
>
>
> Thanks
> Heiko
>
> _______________________________________________
> Linux-rockchip mailing list
> Linux-rockchip at lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-rockchip
>
>
>