linux-kernel - Re: [PATCH v5 2/4] soc: samsung: usi: add a routine for unconfiguring the ip

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Message-ID: <81ff734b-7a5e-4c98-9df2-9b65996fff78@kernel.org>
Date: Tue, 14 Jan 2025 19:03:22 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Ivaylo Ivanov <ivo.ivanov.ivanov1@...il.com>,
 Rob Herring <robh@...nel.org>, Conor Dooley <conor+dt@...nel.org>,
 Alim Akhtar <alim.akhtar@...sung.com>,
 Sam Protsenko <semen.protsenko@...aro.org>,
 Peter Griffin <peter.griffin@...aro.org>
Cc: devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/4] soc: samsung: usi: add a routine for unconfiguring
 the ip

On 09/01/2025 10:03, Ivaylo Ivanov wrote:
> +static void exynos_usi_unconfigure(void *data)
> +{
> +	struct exynos_usi *usi = data;
> +	u32 val;
> +
> +	/* Make sure that we've stopped providing the clock to USI IP */
> +	val = readl(usi->regs + USI_OPTION);
> +	val &= ~USI_OPTION_CLKREQ_ON;
> +	val |= ~USI_OPTION_CLKSTOP_ON;
> +	writel(val, usi->regs + USI_OPTION);
> +
> +	/* Set USI block state to reset */
> +	val = readl(usi->regs + USI_CON);
> +	val |= USI_CON_RESET;
> +	writel(val, usi->regs + USI_CON);
Also shouldn't you enable clocks for accessing these? They are being
disabled at the end of exynos_usi_enable().

Best regards,
Krzysztof