linux-kernel - Re: [PATCH] soc/tegra: pmc: Add IO Pad table for tegra234

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Date:   Mon, 8 Aug 2022 11:50:20 +0100
From:   Ben Dooks <ben.dooks@...ethink.co.uk>
To:     Petlozu Pravareshwar <petlozup@...dia.com>, jonathanh@...dia.com,
        thierry.reding@...il.com, p.zabel@...gutronix.de,
        dmitry.osipenko@...labora.com, ulf.hansson@...aro.org,
        kkartik@...dia.com, cai.huoqing@...ux.dev, spatra@...dia.com,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] soc/tegra: pmc: Add IO Pad table for tegra234

On 05/08/2022 11:41, Petlozu Pravareshwar wrote:
> Add IO PAD table for tegra234 to allow configuring dpd mode
> and switching the pins to 1.8V or 3.3V as needed.
> 
> In tegra234, DPD registers are reorganized such that there is
> a DPD_REQ register and a DPD_STATUS register per pad group.
> This change accordingly updates the PMC driver.
> 
> Signed-off-by: Petlozu Pravareshwar <petlozup@...dia.com>
> ---
>   drivers/soc/tegra/pmc.c | 116 ++++++++++++++++++++++++++++++++++++++--
>   1 file changed, 112 insertions(+), 4 deletions(-)


snip

>   /**
> @@ -1546,6 +1560,14 @@ static int tegra_io_pad_get_dpd_register_bit(struct tegra_pmc *pmc,
>   	if (pad->dpd == UINT_MAX)
>   		return -ENOTSUPP;
>   
> +	if (pmc->soc->has_reorg_hw_dpd_reg_impl) {
> +		*mask = BIT(pad->dpd);
> +		*status = pmc->soc->regs->reorg_dpd_status[pad->reg_index];
> +		*request = pmc->soc->regs->reorg_dpd_req[pad->reg_index];
> +
> +		goto done;
> +	}
> +
>   	*mask = BIT(pad->dpd % 32);
>   
>   	if (pad->dpd < 32) {
> @@ -1556,6 +1578,7 @@ static int tegra_io_pad_get_dpd_register_bit(struct tegra_pmc *pmc,
>   		*request = pmc->soc->regs->dpd2_req;
>   	}
>   
> +done:
>   	return 0;
>   }
>   
> @@ -3132,6 +3155,7 @@ static const struct tegra_pmc_soc tegra20_pmc_soc = {
>   	.num_pmc_clks = 0,
>   	.has_blink_output = true,
>   	.has_usb_sleepwalk = true,
> +	.has_reorg_hw_dpd_reg_impl = false,
>   };

I don't think you need to set false values in these blocks, the
default should be false.



-- 
Ben Dooks				http://www.codethink.co.uk/
Senior Engineer				Codethink - Providing Genius

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