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

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Date:   Wed, 8 May 2019 21:23:19 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Philipp Zabel <p.zabel@...gutronix.de>
Cc:     robh+dt@...nel.org, 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 Philipp,

On Fri, May 03, 2019 at 04:55:21PM +0200, Philipp Zabel wrote:
> 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.
> 

Ah, yes!

> >  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:
>  

Okay

> >  #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.
> 

I read BITS_PER_BYTE wrong :/ Without nr_resets I can reuse the
reset_simple_active_low struct.

> > +	.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. 
> 

Thanks!

Regards,
Mani

> regards
> Philipp