linux-kernel - Re: [Patch v9 1/4] memory: tegra: Add memory controller channels support

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Message-ID: <8fc06781-72a0-9f86-e9cc-6af2425f2077@collabora.com>
Date:   Fri, 29 Apr 2022 11:50:49 +0300
From:   Dmitry Osipenko <dmitry.osipenko@...labora.com>
To:     Ashish Mhetre <amhetre@...dia.com>, krzysztof.kozlowski@...aro.org,
        thierry.reding@...il.com, jonathanh@...dia.com, digetx@...il.com,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
        devicetree@...r.kernel.org
Cc:     vdumpa@...dia.com, Snikam@...dia.com
Subject: Re: [Patch v9 1/4] memory: tegra: Add memory controller channels
 support

On 4/26/22 10:38, Ashish Mhetre wrote:
> +static int tegra186_mc_map_regs(struct tegra_mc *mc)
> +{
> +	struct platform_device *pdev = to_platform_device(mc->dev);
> +	unsigned int i;
> +
> +	mc->bcast_ch_regs = devm_platform_ioremap_resource_byname(pdev, "broadcast");
> +	if (IS_ERR(mc->bcast_ch_regs)) {
> +		if (PTR_ERR(mc->bcast_ch_regs) == -EINVAL) {
> +			dev_warn(&pdev->dev, "Broadcast channel is missing, please update your device-tree\n");
> +			mc->bcast_ch_regs = NULL;
> +			return 0;
> +		}
> +		return PTR_ERR(mc->bcast_ch_regs);
> +	}
> +
> +	mc->ch_regs = devm_kcalloc(mc->dev, mc->soc->num_channels,
> +				   sizeof(*mc->ch_regs), GFP_KERNEL);
> +	if (!mc->ch_regs)
> +		return -ENOMEM;
> +
> +	for (i = 0; i < mc->soc->num_channels; i++) {
> +		char name[5];
> +
> +		snprintf(name, sizeof(name), "ch%u", i);
> +		mc->ch_regs[i] = devm_platform_ioremap_resource_byname(pdev, name);
> +		if (IS_ERR(mc->ch_regs[i]))
> +			return PTR_ERR(mc->ch_regs[i]);
> +	}
> +
> +	return 0;
> +}
> +
>  const struct tegra_mc_ops tegra186_mc_ops = {
>  	.probe = tegra186_mc_probe,
>  	.remove = tegra186_mc_remove,
>  	.resume = tegra186_mc_resume,
>  	.probe_device = tegra186_mc_probe_device,
> +	.map_regs = tegra186_mc_map_regs,
>  };

Do we really need the map_regs() callback? Could you please move it to
the tegra186_mc_probe()? .. Sorry, I haven't noticed this previously.