Re: [PATCH v1 03/43] soc: Add SoC driver for Cirrus ep93xx

[Nikita Shubin <nikita.shubin@maquefel.me>]

Hello Paul.

Thnak you for your comments.

On Thu, 1 Jun 2023 07:53:38 +0200
Paul Menzel <pmenzel@molgen.mpg.de> wrote:

> Dear Nikita,
> 
> 
> Thank you for your patch. Some small nit picks.
> 
> Am 01.06.23 um 07:33 schrieb Nikita Shubin:
> > This adds an SoC driver for the ep93xx. Currently there
> > is only one thing not fitting into any other framework,
> > and that is the swlock setting.  
> 
> If you reflow for 75 characters per line, this would fit into two
> lines.
> 
> > It's used for clock settings and restart.  
> 
> What datasheet did you use, and on what board did you test this?

Adding link to v0 series:
https://lore.kernel.org/all/20230424123522.18302-1-nikita.shubin@maquefel.me/

Tested on ts7250 64 RAM/128 MiB Nand flash, edb9302.

> What datasheet did you use

ep9301/ep9302/ep9307/ep9312/ep9315 datasheet
ep93xx user guide

> 
> > Signed-off-by: Nikita Shubin <nikita.shubin@maquefel.me>
> > Tested-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>
> > Acked-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>
> > Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
> > ---  
> 
> […]
> 
> >   drivers/soc/Kconfig               |   1 +
> >   drivers/soc/Makefile              |   1 +
> >   drivers/soc/cirrus/Kconfig        |  11 +++
> >   drivers/soc/cirrus/Makefile       |   2 +
> >   drivers/soc/cirrus/soc-ep93xx.c   | 134
> > ++++++++++++++++++++++++++++++ include/linux/soc/cirrus/ep93xx.h |
> > 16 +++- 6 files changed, 161 insertions(+), 4 deletions(-)
> >   create mode 100644 drivers/soc/cirrus/Kconfig
> >   create mode 100644 drivers/soc/cirrus/Makefile
> >   create mode 100644 drivers/soc/cirrus/soc-ep93xx.c
> > 
> > diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig
> > index 4e176280113a..6149f0447b61 100644
> > --- a/drivers/soc/Kconfig
> > +++ b/drivers/soc/Kconfig
> > @@ -30,5 +30,6 @@ source "drivers/soc/ti/Kconfig"
> >   source "drivers/soc/ux500/Kconfig"
> >   source "drivers/soc/versatile/Kconfig"
> >   source "drivers/soc/xilinx/Kconfig"
> > +source "drivers/soc/cirrus/Kconfig"
> >   
> >   endmenu
> > diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile
> > index 3b0f9fb3b5c8..7a8a154b8d96 100644
> > --- a/drivers/soc/Makefile
> > +++ b/drivers/soc/Makefile
> > @@ -36,3 +36,4 @@ obj-y				+= ti/
> >   obj-$(CONFIG_ARCH_U8500)	+= ux500/
> >   obj-$(CONFIG_PLAT_VERSATILE)	+= versatile/
> >   obj-y				+= xilinx/
> > +obj-$(CONFIG_EP93XX_SOC)	+= cirrus/
> > diff --git a/drivers/soc/cirrus/Kconfig b/drivers/soc/cirrus/Kconfig
> > new file mode 100644
> > index 000000000000..bc82c0422325
> > --- /dev/null
> > +++ b/drivers/soc/cirrus/Kconfig
> > @@ -0,0 +1,11 @@
> > +# SPDX-License-Identifier: GPL-2.0
> > +
> > +if ARCH_EP93XX
> > +
> > +config EP93XX_SOC
> > +	bool "Cirrus EP93xx chips SoC"
> > +	default y if !EP93XX_SOC_COMMON
> > +	help
> > +	  Support Soc for Cirrus EP93xx chips.  
> 
> Above (and more common in the whole SOC directory) you spell it SoC.
> 
> > +
> > +endif
> > diff --git a/drivers/soc/cirrus/Makefile
> > b/drivers/soc/cirrus/Makefile new file mode 100644
> > index 000000000000..ed6752844c6f
> > --- /dev/null
> > +++ b/drivers/soc/cirrus/Makefile
> > @@ -0,0 +1,2 @@
> > +# SPDX-License-Identifier: GPL-2.0
> > +obj-y	+= soc-ep93xx.o
> > diff --git a/drivers/soc/cirrus/soc-ep93xx.c
> > b/drivers/soc/cirrus/soc-ep93xx.c new file mode 100644
> > index 000000000000..64842e9e2316
> > --- /dev/null
> > +++ b/drivers/soc/cirrus/soc-ep93xx.c
> > @@ -0,0 +1,134 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Soc driver for Cirrus EP93xx chips.  
> 
> Ditto.
> 
> > + * Copyright (C) 2022 Nikita Shubin <nikita.shubin@maquefel.me>
> > + *
> > + * Based on a rewrite of arch/arm/mach-ep93xx/core.c
> > + * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
> > + * Copyright (C) 2007 Herbert Valerio Riedel <hvr@gnu.org>
> > + *
> > + * Thanks go to Michael Burian and Ray Lehtiniemi for their key
> > + * role in the ep93xx linux community  
> 
> If you know their email addresses, you could add those too. Maybe
> also add a dot/period at the end.
> 
> > + */
> > +
> > +#include <linux/soc/cirrus/ep93xx.h>
> > +#include <linux/init.h>
> > +#include <linux/kernel.h>
> > +#include <linux/mfd/syscon.h>
> > +#include <linux/regmap.h>
> > +#include <linux/of.h>
> > +
> > +#define EP93XX_SYSCON_DEVCFG		0x80
> > +
> > +#define EP93XX_SWLOCK_MAGICK		0xaa
> > +#define EP93XX_SYSCON_SWLOCK		0xc0
> > +#define EP93XX_SYSCON_SYSCFG		0x9c
> > +#define EP93XX_SYSCON_SYSCFG_REV_MASK	(0xf0000000)
> > +#define EP93XX_SYSCON_SYSCFG_REV_SHIFT	(28)  
> 
> […]
> 
> 
> Kind regards,
> 
> Paul