linux-kernel - Re: [Patch v4 3/4] memory: tegra: Add memory controller channels support

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Message-ID: <34646ebd-2c37-65ec-ecfe-cfbfa4bd29d2@canonical.com>
Date:   Wed, 2 Mar 2022 20:35:57 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Ashish Mhetre <amhetre@...dia.com>, robh+dt@...nel.org,
        thierry.reding@...il.com, jonathanh@...dia.com, digetx@...il.com,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-tegra@...r.kernel.org
Cc:     vdumpa@...dia.com, Snikam@...dia.com
Subject: Re: [Patch v4 3/4] memory: tegra: Add memory controller channels
 support

On 02/03/2022 09:43, Ashish Mhetre wrote:
> From tegra186 onwards, memory controller support multiple channels.
> Add support for mapping address spaces of these channels.
> During error interrupts from memory controller, appropriate registers
> from these channels need to be accessed for logging error info.
> 
> Signed-off-by: Ashish Mhetre <amhetre@...dia.com>
> ---
>  drivers/memory/tegra/mc.c       |  6 ++++++
>  drivers/memory/tegra/tegra186.c | 21 +++++++++++++++++++++
>  drivers/memory/tegra/tegra194.c |  1 +
>  drivers/memory/tegra/tegra234.c |  1 +
>  include/soc/tegra/mc.h          |  7 +++++++
>  5 files changed, 36 insertions(+)
> 
> diff --git a/drivers/memory/tegra/mc.c b/drivers/memory/tegra/mc.c
> index bf3abb6..3cda1d9 100644
> --- a/drivers/memory/tegra/mc.c
> +++ b/drivers/memory/tegra/mc.c
> @@ -749,6 +749,12 @@ static int tegra_mc_probe(struct platform_device *pdev)
>  	if (IS_ERR(mc->regs))
>  		return PTR_ERR(mc->regs);
>  
> +	if (mc->soc->ops && mc->soc->ops->map_regs) {
> +		err = mc->soc->ops->map_regs(mc, pdev);
> +		if (err < 0)
> +			return err;
> +	}
> +
>  	mc->debugfs.root = debugfs_create_dir("mc", NULL);
>  
>  	if (mc->soc->ops && mc->soc->ops->probe) {
> diff --git a/drivers/memory/tegra/tegra186.c b/drivers/memory/tegra/tegra186.c
> index 3d15388..59a4425 100644
> --- a/drivers/memory/tegra/tegra186.c
> +++ b/drivers/memory/tegra/tegra186.c
> @@ -139,11 +139,31 @@ static int tegra186_mc_probe_device(struct tegra_mc *mc, struct device *dev)
>  	return 0;
>  }
>  
> +static int tegra186_mc_map_regs(struct tegra_mc *mc,
> +				struct platform_device *pdev)
> +{
> +	struct resource *res;
> +	int i;
> +
> +	mc->mcb_regs = devm_platform_get_and_ioremap_resource(pdev, 1, &res);
> +	if (IS_ERR(mc->mcb_regs))
> +		return PTR_ERR(mc->mcb_regs);
> +
> +	for (i = 0; i < mc->soc->num_channels; i++) {
> +		mc->mc_regs[i] = devm_platform_get_and_ioremap_resource(pdev, i + 2, &res);
> +		if (IS_ERR(mc->mc_regs[i]))
> +			return PTR_ERR(mc->mc_regs[i]);

This breaks the ABI, so I need Thierry's ack that such ABI break is
perfectly ok.

> +	}
> +
> +	return 0;
> +}
> +


Best regards,
Krzysztof