linux-kernel - Re: [PATCH 1/6] i2c: tegra: Add support for Tegra234 I2C

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Date:   Tue, 18 Jan 2022 23:54:14 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Akhil R <akhilrajeev@...dia.com>, robh+dt@...nel.org,
        thierry.reding@...il.com, jonathanh@...dia.com,
        mperttunen@...dia.com, ldewangan@...dia.com,
        linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] i2c: tegra: Add support for Tegra234 I2C

13.01.2022 16:30, Akhil R пишет:
> +static const struct tegra_i2c_hw_feature tegra234_i2c_hw = {
> +	.has_continue_xfer_support = true,
> +	.has_per_pkt_xfer_complete_irq = true,
> +	.clk_divisor_hs_mode = 0x2,
> +	.clk_divisor_std_mode = 0x4f,
> +	.clk_divisor_fast_mode = 0x58,
> +	.clk_divisor_fast_plus_mode = 0x24,
> +	.has_config_load_reg = true,
> +	.has_multi_master_mode = true,
> +	.has_slcg_override_reg = true,
> +	.has_mst_fifo = true,
> +	.quirks = &tegra194_i2c_quirks,
> +	.supports_bus_clear = true,
> +	.has_apb_dma = false,
> +	.tlow_std_mode = 0x8,
> +	.thigh_std_mode = 0x7,
> +	.tlow_fast_fastplus_mode = 0x1,
> +	.thigh_fast_fastplus_mode = 0x1,
> +	.setup_hold_time_std_mode = 0x08080808,
> +	.setup_hold_time_fast_fast_plus_mode = 0x02020202,
> +	.setup_hold_time_hs_mode = 0x090909,
> +	.has_interface_timing_reg = true,
> +};

Why tegra194_i2c_hw can't be reused by T234? Looks like I2C h/w hasn't
changed and somebody just made a minor tuning of the timing parameters,
does it really matter in practice?