linux-kernel - Re: [PATCH 3/3] reset: Add reset controller support for BM1880 SoC

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Date:   Fri, 03 May 2019 16:55:21 +0200
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        robh+dt@...nel.org
Cc:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        haitao.suo@...main.com, darren.tsao@...main.com
Subject: Re: [PATCH 3/3] reset: Add reset controller support for BM1880 SoC

Hi Manivannan,

thank you for the patch. A few issues below:

On Thu, 2019-04-25 at 18:25 +0530, Manivannan Sadhasivam wrote:
> Add reset controller support for Bitmain BM1880 SoC reusing the
> reset-simple driver. While we are at it, this driver has also been
> modified to make use of the SPDX license identifier.
> 
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> ---
>  drivers/reset/Kconfig        |  3 ++-
>  drivers/reset/Makefile       |  1 +
>  drivers/reset/reset-simple.c | 16 +++++++++++-----
>  3 files changed, 14 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
> index 2c8c23db92fb..b25e8d139f0d 100644
> --- a/drivers/reset/Kconfig
> +++ b/drivers/reset/Kconfig
> @@ -117,7 +117,7 @@ config RESET_QCOM_PDC
>  
>  config RESET_SIMPLE
>  	bool "Simple Reset Controller Driver" if COMPILE_TEST
> -	default ARCH_STM32 || ARCH_STRATIX10 || ARCH_SUNXI || ARCH_ZX || ARCH_ASPEED
> +	default ARCH_STM32 || ARCH_STRATIX10 || ARCH_SUNXI || ARCH_ZX || ARCH_ASPEED || ARCH_BITMAIN
>  	help
>  	  This enables a simple reset controller driver for reset lines that
>  	  that can be asserted and deasserted by toggling bits in a contiguous,
> @@ -129,6 +129,7 @@ config RESET_SIMPLE
>  	   - RCC reset controller in STM32 MCUs
>  	   - Allwinner SoCs
>  	   - ZTE's zx2967 family
> +	   - Bitmain BM1880 SoC
>  
>  config RESET_STM32MP157
>  	bool "STM32MP157 Reset Driver" if COMPILE_TEST
> diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
> index 61456b8f659c..b87968771166 100644
> --- a/drivers/reset/Makefile
> +++ b/drivers/reset/Makefile
> @@ -7,6 +7,7 @@ obj-$(CONFIG_RESET_A10SR) += reset-a10sr.o
>  obj-$(CONFIG_RESET_ATH79) += reset-ath79.o
>  obj-$(CONFIG_RESET_AXS10X) += reset-axs10x.o
>  obj-$(CONFIG_RESET_BERLIN) += reset-berlin.o
> +#obj-$(CONFIG_RESET_BM1880) += reset-bm1880.o

Leftover from a previous patch version? You can remove this.

>  obj-$(CONFIG_RESET_BRCMSTB) += reset-brcmstb.o
>  obj-$(CONFIG_RESET_HSDK) += reset-hsdk.o
>  obj-$(CONFIG_RESET_IMX7) += reset-imx7.o
> diff --git a/drivers/reset/reset-simple.c b/drivers/reset/reset-simple.c
> index 77fbba3100c8..fd1fa4984d76 100644
> --- a/drivers/reset/reset-simple.c
> +++ b/drivers/reset/reset-simple.c
> @@ -1,3 +1,4 @@
> +// SPDX-License-Identifier: GPL-2.0+
>  /*
>   * Simple Reset Controller Driver
>   *
> @@ -8,11 +9,6 @@
>   * Copyright 2013 Maxime Ripard
>   *
>   * Maxime Ripard <maxime.ripard@...e-electrons.com>
> - *
> - * This program is free software; you can redistribute it and/or modify
> - * it under the terms of the GNU General Public License as published by
> - * the Free Software Foundation; either version 2 of the License, or
> - * (at your option) any later version.
>   */

Please split this change into a separate patch and add Maxime to Cc:
 
>  #include <linux/device.h>
> @@ -119,6 +115,14 @@ static const struct reset_simple_devdata reset_simple_active_low = {
>  	.status_active_low = true,
>  };
>  
> +#define BM1880_NR_BANKS		2
> +
> +static const struct reset_simple_devdata reset_simple_bm1880 = {
> +	.nr_resets = BM1880_NR_BANKS * 32,

This is not necessary, given your device tree changes, the

        data->rcdev.nr_resets = resource_size(res) * BITS_PER_BYTE;

in reset_simple_probe should already do the right thing.
You can remove the .nr_resets from reset_simple_bm1880 and the
BM1880_NR_BANKS #define.

> +	.active_low = true,
> +	.status_active_low = true,
> +};
> +
>  static const struct of_device_id reset_simple_dt_ids[] = {
>  	{ .compatible = "altr,stratix10-rst-mgr",
>  		.data = &reset_simple_socfpga },
> @@ -129,6 +133,8 @@ static const struct of_device_id reset_simple_dt_ids[] = {
>  		.data = &reset_simple_active_low },
>  	{ .compatible = "aspeed,ast2400-lpc-reset" },
>  	{ .compatible = "aspeed,ast2500-lpc-reset" },
> +	{ .compatible = "bitmain,bm1880-reset",
> +		.data = &reset_simple_bm1880 },
>  	{ /* sentinel */ },
>  };

With these changes,
Reviewed-by: Philipp Zabel <p.zabel@...gutronix.de>
for both parts. 

regards
Philipp