# Re: \[PATCH 3/3\] pinctrl: meson: add pinctrl driver support for Meson-S4 Soc

- From: qianggui.song \<hidden\>
- Date: 2021-12-16 06:08:16 
- List: linux-arm-kernel
- Page: https://ratatoskr.run/linux-arm-kernel/2021/12/8815759
- Thread: https://ratatoskr.run/linux-arm-kernel/2021/12/1607554/t.md

```text
Hi, Jerome

On 2021/12/14 下午6:00, Jerome Brunet wrote:
>
>
> On Tue 14 Dec 2021 at 10:21, Qianggui Song [ref] wrote:
>
>> Add new pinctrl driver for Amlogic's Meson-S4 SoC which share the
>> same register laytout as the previous Meson-A1.
>>
>> Signed-off-by: Qianggui Song <redacted>
>> ---
>
> [...]
>
>> +
>> +/* Bank D func1 */
>> +static const unsigned int uart_b_tx_d_pins[]		= { GPIOD_0 };
>> +static const unsigned int uart_b_rx_d_pins[]		= { GPIOD_1 };
>> +static const unsigned int uart_b_cts_d_pins[]		= { GPIOD_2 };
>> +static const unsigned int uart_b_rts_d_pins[]		= { GPIOD_3 };
>
> Your S805x2 documenation says the 4 pins above are HDMI related for func 1
>
>> +static const unsigned int remote_out_pins[]		= { GPIOD_4 };
>> +static const unsigned int remote_in_pins[]		= { GPIOD_5 };
>
> SPDIF for those 2
>
>> +static const unsigned int jtag_1_clk_pins[]		= { GPIOD_6 };
>> +static const unsigned int jtag_1_tms_pins[]		= { GPIOD_7 };
>> +static const unsigned int jtag_1_tdi_pins[]		= { GPIOD_8 };
>> +static const unsigned int jtag_1_tdo_pins[]		= { GPIOD_9 };
>
> I2C for those 4
>
> It goes on like this for the rest of GPIO Bank D and I did not check the
> other banks
>
> Could you please clarify
> * Does the S4 applies to S805X2, S905Y4, Both ?
> * Is the S805X2 Datasheet Revision 0.4 accurate ?

Explain the above confuse here, yes, the S4 does apply to both S805X2 and S905Y4, and I create this .c driver based on S805X2 Datasheet Revision 0.5. I have no S805X2 Datasheet 0.4 on hand however our reference board works well based on Revision 0.5 configuration.
>
>> +static const unsigned int clk12_24_pins[]		= { GPIOD_10 };
>> +static const unsigned int pwm_g_hiz_pins[]		= { GPIOD_11 };
>> +
>
> [...]
>
>> +
>> +static const char * const tdm_groups[] = {
>> +	"tdm_d2_c", "tdm_d3_c", "tdm_fs1_c", "tdm_d4_c", "tdm_d5_c",
>> +	"tdm_fs1_d", "tdm_d4_d", "tdm_d3_d", "tdm_d2_d", "tdm_sclk1_d",
>> +	"tdm_sclk1_h", "tdm_fs1_h", "tdm_d2_h", "tdm_d3_h", "tdm_d4_h",
>> +	"tdm_d1", "tdm_d0", "tdm_fs0", "tdm_sclk0", "tdm_fs2", "tdm_sclk2",
>> +	"tdm_d4_z", "tdm_d5_z", "tdm_d6", "tdm_d7"
>> +};
>
> On previous chip, there were pin assigned to tdm A, B or C.
> On this generation, it seems you have added a second level on pinmuxing
> to re-route the audio pins to different controllers
>
> In such case, I don't think they belong in the same group.
> Depending on settins, D2 and D3 could be unrelated
>
> I think each audio pin should have its own group (one group for D3, one
> D4, etc ...)
>
According to our audio colleague, on this chip, tdm A/B/C can choose which pins are routed to their controllers freely by writing special registers, say, tdm_d2_c can be assigned to any of tdm a, b and c by demand, so no need to specify a/b/c words any more.
>> +
>> +static const char * const mclk_groups[] = {
>> +	"mclk_1_c", "mclk_1_d", "mclk_1_h", "mclk_2"
>> +
>> +};
>
> mclk_1 and mclk_2 should be in separate groups
>
Okay,will fix it in next patch.
>> +
>> +static const char * const remote_out_groups[] = {
>> +	"remote_out"
>> +};
>> +
>> +static const char * const remote_in_groups[] = {
>> +	"remote_in"
>> +};
>> +
>> +static const char * const clk12_24_groups[] = {
>> +	"clk12_24"
>> +};
>> +
>> +static const char * const clk_32k_in_groups[] = {
>> +	"clk_32k_in"
>> +};
>> +
>> +static const char * const pwm_a_hiz_groups[] = {
>> +	"pwm_a_hiz"
>> +};
>> +
>
> I'm curious to know what the pwm hiz function is ?
>
This is a special mode of pwm and short for high-intensity zone. If this mode is enable, when pwm is in "on" time, pin of pwm become hiz state, the high level is not driven by chips but a pull-up resistor.
> .
>

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