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From: Antony Pavlov <antonynpavlov@gmail.com>
To: Josh Cartwright <joshc@eso.teric.us>
Cc: barebox@lists.infradead.org, Michal Simek <monstr@monstr.eu>
Subject: Re: [PATCH 4/5] ARM: zynq: add support for Zynq 7000 SoC
Date: Sun, 3 Mar 2013 11:24:53 +0400	[thread overview]
Message-ID: <CAA4bVAGNk98jtGkGNh=L27ZtRUkFEw=0gQLRYG3OcuHpBtHCRw@mail.gmail.com> (raw)
In-Reply-To: <13f79e3d64f81140c9637abbf78cf3a70be1099c.1362273612.git.joshc@eso.teric.us>

On 3 March 2013 04:48, Josh Cartwright <joshc@eso.teric.us> wrote:
> Signed-off-by: Josh Cartwright <joshc@eso.teric.us>
> ---
>  arch/arm/Kconfig                           |   9 +
>  arch/arm/mach-zynq/Kconfig                 |   3 +
>  arch/arm/mach-zynq/Makefile                |   1 +
>  arch/arm/mach-zynq/clocks.c                | 341 +++++++++++++++++++++++++++++
>  arch/arm/mach-zynq/include/mach/clkdev.h   |   7 +
>  arch/arm/mach-zynq/include/mach/debug_ll.h |  21 ++
>  arch/arm/mach-zynq/include/mach/slcr.h     |  26 +++
>  arch/arm/mach-zynq/reset.c                 |  28 +++
>  8 files changed, 436 insertions(+)
>  create mode 100644 arch/arm/mach-zynq/Kconfig
>  create mode 100644 arch/arm/mach-zynq/Makefile
>  create mode 100644 arch/arm/mach-zynq/clocks.c
>  create mode 100644 arch/arm/mach-zynq/include/mach/clkdev.h
>  create mode 100644 arch/arm/mach-zynq/include/mach/debug_ll.h
>  create mode 100644 arch/arm/mach-zynq/include/mach/slcr.h
>  create mode 100644 arch/arm/mach-zynq/reset.c
>
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index 28332ec..37b7de0 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -110,6 +110,14 @@ config ARCH_TEGRA
>         select CPU_ARM926T
>         select HAS_DEBUG_LL
>
> +config ARCH_ZYNQ
> +       bool "Xilinx Zynq-based boards"
> +       select CPU_V7
> +       select HAS_DEBUG_LL
> +       select CLKDEV_LOOKUP
> +       select COMMON_CLK
> +       select ARM_SMP_TWD
> +
>  endchoice
>
>  source arch/arm/cpu/Kconfig
> @@ -126,6 +134,7 @@ source arch/arm/mach-pxa/Kconfig
>  source arch/arm/mach-samsung/Kconfig
>  source arch/arm/mach-versatile/Kconfig
>  source arch/arm/mach-tegra/Kconfig
> +source arch/arm/mach-zynq/Kconfig
>
>  config ARM_ASM_UNIFIED
>         bool
> diff --git a/arch/arm/mach-zynq/Kconfig b/arch/arm/mach-zynq/Kconfig
> new file mode 100644
> index 0000000..90b17f3
> --- /dev/null
> +++ b/arch/arm/mach-zynq/Kconfig
> @@ -0,0 +1,3 @@
> +if ARCH_ZYNQ
> +
> +endif
> diff --git a/arch/arm/mach-zynq/Makefile b/arch/arm/mach-zynq/Makefile
> new file mode 100644
> index 0000000..58c62a9
> --- /dev/null
> +++ b/arch/arm/mach-zynq/Makefile
> @@ -0,0 +1 @@
> +obj-y  += reset.o clocks.o
> diff --git a/arch/arm/mach-zynq/clocks.c b/arch/arm/mach-zynq/clocks.c
> new file mode 100644
> index 0000000..1e8ca5a
> --- /dev/null
> +++ b/arch/arm/mach-zynq/clocks.c
> @@ -0,0 +1,341 @@
> +/*
> + * Copyright (c) 2013 Josh Cartwright <joshc@eso.teric.us>
> + *
> + * Based on drivers/clk-zynq.c from Linux.
> + *
> + * Copyright (c) 2012 National Instruments
> + *
> + * Josh Cartwright <josh.cartwright@ni.com>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms and conditions of the GNU General Public License,
> + * version 2, as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
> + * more details.
> + *
> + * You should have received a copy of the GNU General Public License along with
> + * this program.  If not, see <http://www.gnu.org/licenses/>.
> + */
> +#include <common.h>
> +#include <init.h>
> +#include <malloc.h>
> +#include <linux/clk.h>
> +#include <linux/clkdev.h>
> +#include <linux/err.h>
> +
> +#include <io.h>
> +
> +#define ZYNQ_SLCR_BASE 0xF8000000
> +
> +enum zynq_clks {
> +       dummy, ps_clk, arm_pll, ddr_pll, io_pll, uart_clk, uart0, uart1,
> +       cpu_clk, cpu_6x4x, cpu_3x2x, cpu_2x, cpu_1x, clks_max
> +};
> +
> +static struct clk *clks[clks_max];
> +
> +struct zynq_pll_clk {
> +       struct clk      clk;
> +       void __iomem    *pll_ctrl;
> +};
> +
> +#define to_zynq_pll_clk(c)     container_of(c, struct zynq_pll_clk, clk)
> +
> +#define PLL_CTRL_FDIV(x)       (((x) >> 12) & 0x7F)
> +
> +static unsigned long zynq_pll_recalc_rate(struct clk *clk,
> +                                         unsigned long parent_rate)
> +{
> +       struct zynq_pll_clk *pll = to_zynq_pll_clk(clk);
> +       return parent_rate * PLL_CTRL_FDIV(readl(pll->pll_ctrl));
> +}
> +
> +static struct clk_ops zynq_pll_clk_ops = {
> +       .recalc_rate    = zynq_pll_recalc_rate,
> +};
> +
> +static inline struct clk *zynq_pll_clk(const char *name, void __iomem *pll_ctrl)
> +{
> +       static const char *pll_parent = "ps_clk";
> +       struct zynq_pll_clk *pll;
> +       int ret;
> +
> +       pll = xzalloc(sizeof(*pll));
> +
> +       pll->pll_ctrl           = pll_ctrl;
> +       pll->clk.ops            = &zynq_pll_clk_ops;
> +       pll->clk.name           = name;
> +       pll->clk.parent_names   = &pll_parent;
> +       pll->clk.num_parents    = 1;
> +
> +       ret = clk_register(&pll->clk);
> +       if (ret) {
> +               free(pll);
> +               return ERR_PTR(ret);
> +       }
> +
> +       return &pll->clk;
> +}
> +
> +struct zynq_periph_clk {
> +       struct clk      clk;
> +       void __iomem    *clk_ctrl;
> +};
> +
> +#define to_zynq_periph_clk(c)  container_of(c, struct zynq_periph_clk, c)
> +
> +static const u8 periph_clk_parent_map[] = {
> +       0, 0, 1, 2
> +};
> +#define PERIPH_CLK_CTRL_SRC(x) (periph_clk_parent_map[((x) & 0x30) >> 4])
> +#define PERIPH_CLK_CTRL_DIV(x) (((x) & 0x3F00) >> 8)
> +
> +static unsigned long zynq_periph_recalc_rate(struct clk *clk,
> +                                            unsigned long parent_rate)
> +{
> +       struct zynq_periph_clk *periph = to_zynq_periph_clk(clk);
> +       return parent_rate / PERIPH_CLK_CTRL_DIV(readl(periph->clk_ctrl));
> +}
> +
> +static int zynq_periph_get_parent(struct clk *clk)
> +{
> +       struct zynq_periph_clk *periph = to_zynq_periph_clk(clk);
> +       return PERIPH_CLK_CTRL_SRC(readl(periph->clk_ctrl));
> +}
> +
> +static const struct clk_ops zynq_periph_clk_ops = {
> +       .recalc_rate    = zynq_periph_recalc_rate,
> +       .get_parent     = zynq_periph_get_parent,
> +};
> +
> +static struct clk *zynq_periph_clk(const char *name, void __iomem *clk_ctrl)
> +{
> +       static const char *peripheral_parents[] = {
> +               "io_pll",
> +               "arm_pll",
> +               "ddr_pll",
> +       };
> +       struct zynq_periph_clk *periph;
> +       int ret;
> +
> +       periph = xzalloc(sizeof(*periph));
> +
> +       periph->clk_ctrl        = clk_ctrl;
> +       periph->clk.name        = name;
> +       periph->clk.ops         = &zynq_periph_clk_ops;
> +
> +       periph->clk.parent_names = peripheral_parents;
> +       periph->clk.num_parents  = ARRAY_SIZE(peripheral_parents);
> +
> +       ret = clk_register(&periph->clk);
> +       if (ret) {
> +               free(periph);
> +               return ERR_PTR(ret);
> +       }
> +
> +       return &periph->clk;
> +}
> +
> +/* CPU Clock domain is modelled as a mux with 4 children subclks, whose
> + * derivative rates depend on CLK_621_TRUE
> + */
> +
> +struct zynq_cpu_clk {
> +       struct clk              clk;
> +       void __iomem            *clk_ctrl;
> +};
> +
> +#define to_zynq_cpu_clk(c)     container_of(c, struct zynq_cpu_clk, c)
> +
> +static const u8 zynq_cpu_clk_parent_map[] = {
> +       1, 1, 2, 0
> +};
> +#define CPU_CLK_SRCSEL(x)      (zynq_cpu_clk_parent_map[(((x) & 0x30) >> 4)])
> +#define CPU_CLK_CTRL_DIV(x)    (((x) & 0x3F00) >> 8)
> +
> +static unsigned long zynq_cpu_clk_recalc_rate(struct clk *clk,
> +                                             unsigned long parent_rate)
> +{
> +       struct zynq_cpu_clk *cpuclk = to_zynq_cpu_clk(clk);
> +       return parent_rate / CPU_CLK_CTRL_DIV(readl(cpuclk->clk_ctrl));
> +}
> +
> +static int zynq_cpu_clk_get_parent(struct clk *clk)
> +{
> +       struct zynq_cpu_clk *cpuclk = to_zynq_cpu_clk(clk);
> +       return CPU_CLK_SRCSEL(readl(cpuclk->clk_ctrl));
> +}
> +
> +static const struct clk_ops zynq_cpu_clk_ops = {
> +       .get_parent     = zynq_cpu_clk_get_parent,
> +       .recalc_rate    = zynq_cpu_clk_recalc_rate,
> +};
> +
> +static struct clk *zynq_cpu_clk(const char *name, void __iomem *clk_ctrl)
> +{
> +       static const char *cpu_parents[] = {
> +               "io_pll",
> +               "arm_pll",
> +               "ddr_pll",
> +       };
> +       struct zynq_cpu_clk *cpu;
> +       int ret;
> +
> +       cpu = xzalloc(sizeof(*cpu));
> +
> +       cpu->clk_ctrl           = clk_ctrl;
> +       cpu->clk.ops            = &zynq_cpu_clk_ops;
> +       cpu->clk.name           = name;
> +       cpu->clk.parent_names   = cpu_parents;
> +       cpu->clk.num_parents    = ARRAY_SIZE(cpu_parents);
> +
> +       ret = clk_register(&cpu->clk);
> +       if (ret) {
> +               free(cpu);
> +               return ERR_PTR(ret);
> +       }
> +
> +       return &cpu->clk;
> +}
> +
> +enum zynq_cpu_subclk_which {
> +       CPU_SUBCLK_6X4X,
> +       CPU_SUBCLK_3X2X,
> +       CPU_SUBCLK_2X,
> +       CPU_SUBCLK_1X,
> +};
> +
> +struct zynq_cpu_subclk {
> +       struct clk      clk;
> +       void __iomem    *clk_ctrl;
> +       void __iomem    *clk_621;
> +       enum zynq_cpu_subclk_which which;
> +};
> +
> +#define CLK_621_TRUE(x)        ((x) & 1)
> +
> +#define to_zynq_cpu_subclk(c)  container_of(c, struct zynq_cpu_subclk, c);
> +
> +static unsigned long zynq_cpu_subclk_recalc_rate(struct clk *clk,
> +                                                unsigned long parent_rate)
> +{
> +       unsigned long uninitialized_var(rate);
> +       struct zynq_cpu_subclk *subclk;
> +       bool is_621;
> +
> +       subclk = to_zynq_cpu_subclk(clk)
> +       is_621 = CLK_621_TRUE(readl(subclk->clk_621));
> +
> +       switch (subclk->which) {
> +       case CPU_SUBCLK_6X4X:
> +               rate = parent_rate;
> +               break;
> +       case CPU_SUBCLK_3X2X:
> +               rate = parent_rate / 2;
> +               break;
> +       case CPU_SUBCLK_2X:
> +               rate = parent_rate / (is_621 ? 3 : 2);
> +               break;
> +       case CPU_SUBCLK_1X:
> +               rate = parent_rate / (is_621 ? 6 : 4);
> +               break;
> +       };
> +
> +       return rate;
> +}
> +
> +static int zynq_cpu_subclk_enable(struct clk *clk)
> +{
> +       struct zynq_cpu_subclk *subclk;
> +       u32 tmp;
> +
> +       subclk = to_zynq_cpu_subclk(clk);
> +
> +       tmp = readl(subclk->clk_ctrl);
> +       tmp |= 1 << (24 + subclk->which);
> +       writel(tmp, subclk->clk_ctrl);
> +
> +       return 0;
> +}
> +
> +static void zynq_cpu_subclk_disable(struct clk *clk)
> +{
> +       struct zynq_cpu_subclk *subclk;
> +       u32 tmp;
> +
> +       subclk = to_zynq_cpu_subclk(clk);
> +
> +       tmp = readl(subclk->clk_ctrl);
> +       tmp &= ~(1 << (24 + subclk->which));
> +       writel(tmp, subclk->clk_ctrl);
> +}
> +
> +static const struct clk_ops zynq_cpu_subclk_ops = {
> +       .enable         = zynq_cpu_subclk_enable,
> +       .disable        = zynq_cpu_subclk_disable,
> +       .recalc_rate    = zynq_cpu_subclk_recalc_rate,
> +};
> +
> +static struct clk *zynq_cpu_subclk(const char *name,
> +                                  enum zynq_cpu_subclk_which which,
> +                                  void __iomem *clk_ctrl,
> +                                  void __iomem *clk_621)
> +{
> +       static const char *subclk_parent = "cpu_clk";
> +       struct zynq_cpu_subclk *subclk;
> +       int ret;
> +
> +       subclk = xzalloc(sizeof(*subclk));
> +
> +       subclk->clk_ctrl        = clk_ctrl;
> +       subclk->clk_621         = clk_621;
> +       subclk->which           = which;
> +       subclk->clk.name        = name;
> +       subclk->clk.ops         = &zynq_cpu_subclk_ops;
> +
> +       subclk->clk.parent_names        = &subclk_parent;
> +       subclk->clk.num_parents         = 1;
> +
> +       ret = clk_register(&subclk->clk);
> +       if (ret) {
> +               free(subclk);
> +               return ERR_PTR(ret);
> +       }
> +
> +       return &subclk->clk;
> +}
> +
> +static int zynq_init_clks(void)
> +{
> +       void __iomem *slcr_base = (void __iomem *) ZYNQ_SLCR_BASE;
> +
> +       request_iomem_region("zynq_slcr", ZYNQ_SLCR_BASE,
> +                            ZYNQ_SLCR_BASE + 0x1000);
> +
> +       clks[ps_clk]  = clk_fixed("ps_clk", CONFIG_ZYNQ_PS_CLK_FREQ);
> +
> +       clks[arm_pll] = zynq_pll_clk("arm_pll", slcr_base + 0x100);
> +       clks[ddr_pll] = zynq_pll_clk("ddr_pll", slcr_base + 0x104);
> +       clks[ io_pll] = zynq_pll_clk( "io_pll", slcr_base + 0x108);
> +
> +       clks[uart_clk] = zynq_periph_clk("uart_clk", slcr_base + 0x154);
> +
> +       clks[uart0] = clk_gate("uart0", "uart_clk", slcr_base + 0x154, 0);
> +       clks[uart1] = clk_gate("uart1", "uart_clk", slcr_base + 0x154, 1);
> +
> +       clks[cpu_clk] = zynq_cpu_clk("cpu_clk", slcr_base + 0x120);
> +
> +       clks[cpu_6x4x] = zynq_cpu_subclk("cpu_6x4x", CPU_SUBCLK_6X4X, slcr_base + 0x120, slcr_base + 0x1C4);
> +       clks[cpu_3x2x] = zynq_cpu_subclk("cpu_3x2x", CPU_SUBCLK_3X2X, slcr_base + 0x120, slcr_base + 0x1C4);
> +       clks[  cpu_2x] = zynq_cpu_subclk(  "cpu_2x",   CPU_SUBCLK_2X, slcr_base + 0x120, slcr_base + 0x1C4);
> +       clks[  cpu_1x] = zynq_cpu_subclk(  "cpu_1x",   CPU_SUBCLK_1X, slcr_base + 0x120, slcr_base + 0x1C4);
> +
> +       clk_register_clkdev(clks[cpu_3x2x], NULL, "smp_twd0");
> +       clk_register_clkdev(clks[uart0], NULL, "zynq_serial0");
> +       clk_register_clkdev(clks[uart1], NULL, "zynq_serial1");
> +       return 0;
> +}
> +core_initcall(zynq_init_clks);
> diff --git a/arch/arm/mach-zynq/include/mach/clkdev.h b/arch/arm/mach-zynq/include/mach/clkdev.h
> new file mode 100644
> index 0000000..04b37a8
> --- /dev/null
> +++ b/arch/arm/mach-zynq/include/mach/clkdev.h
> @@ -0,0 +1,7 @@
> +#ifndef __ASM_MACH_CLKDEV_H
> +#define __ASM_MACH_CLKDEV_H
> +
> +#define __clk_get(clk) ({ 1; })
> +#define __clk_put(clk) do { } while (0)
> +
> +#endif
> diff --git a/arch/arm/mach-zynq/include/mach/debug_ll.h b/arch/arm/mach-zynq/include/mach/debug_ll.h
> new file mode 100644
> index 0000000..bb180a6
> --- /dev/null
> +++ b/arch/arm/mach-zynq/include/mach/debug_ll.h
> @@ -0,0 +1,21 @@
> +#ifndef __MACH_DEBUG_LL_H__
> +#define __MACH_DEBUG_LL_H__
> +
> +#include <io.h>
> +
> +#define UART_BASE      0xE0001000
> +#define UART_SR                0x0000002C
> +#define UART_FIFO      0x00000030
> +
> +#define UART_SR_TXEMPTY        (1<<3)
> +
> +static inline void PUTC_LL(char c)
> +{
> +       void __iomem *base = (void __iomem *) UART_BASE;
> +
> +       writel(c, base + UART_FIFO);
> +
> +       while (!(readl(base + UART_SR) & UART_SR_TXEMPTY));
> +}
> +
> +#endif
> diff --git a/arch/arm/mach-zynq/include/mach/slcr.h b/arch/arm/mach-zynq/include/mach/slcr.h
> new file mode 100644
> index 0000000..eada153
> --- /dev/null
> +++ b/arch/arm/mach-zynq/include/mach/slcr.h
> @@ -0,0 +1,26 @@
> +#ifndef __MACH_SLCR_H__
> +#define __MACH_SLCR_H__
> +
> +#include <io.h>
> +
> +#define SLCR_BASE              0xF8000000
> +#define SLCR_LOCK              0x00000004
> +#define SLCR_UNLOCK            0x00000008
> +#define SLCR_PSS_RST_CTRL      0x00000200
> +
> +static inline void slcr_write(unsigned long val, unsigned long reg)
> +{
> +       writel(val, SLCR_BASE + reg);
> +}
> +
> +static inline void slcr_unlock(void)
> +{
> +       slcr_write(0xDF0D, SLCR_UNLOCK);
> +}
> +
> +static inline void slcr_lock(void)
> +{
> +       slcr_write(0x767B, SLCR_LOCK);
> +}
> +
> +#endif
> diff --git a/arch/arm/mach-zynq/reset.c b/arch/arm/mach-zynq/reset.c
> new file mode 100644
> index 0000000..8554eca
> --- /dev/null
> +++ b/arch/arm/mach-zynq/reset.c
> @@ -0,0 +1,28 @@
> +/*
> + * Copyright (C) 2013 Josh Cartwright <joshc@eso.teric.us>
> + *
> + * 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.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
> + * MA 02111-1307 USA

Please drop the address of the FSF.

See this

commit 77322aa896895f4f68501a071086e432e575dcc2
Author: Sascha Hauer <s.hauer@pengutronix.de>
Date:   Tue Jul 31 09:51:20 2012 +0200

    Treewide: remove address of the Free Software Foundation

    The FSF address has changed in the past. Instead of updating it
    each time the address changes, just drop it completely treewide.


> + */
> +#include <common.h>
> +#include <mach/slcr.h>
> +
> +void __noreturn reset_cpu(unsigned long addr)
> +{
> +       slcr_unlock();
> +       slcr_write(1, SLCR_PSS_RST_CTRL);
> +
> +       while (1);
> +}
> --
> 1.8.1.2
>
>
>
> _______________________________________________
> barebox mailing list
> barebox@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/barebox



-- 
Best regards,
  Antony Pavlov

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  reply	other threads:[~2013-03-03  7:24 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-03-03  1:20 [PATCH 0/5] Zynq support for barebox Josh Cartwright
2013-03-03  0:48 ` [PATCH 1/5] trivial: doc: fix typos in mach-arm.dox Josh Cartwright
2013-03-03  0:48 ` [PATCH 2/5] defaultenv: fixed mismatched braces in bin/boot Josh Cartwright
2013-03-03  0:48 ` [PATCH 3/5] ARM: zynq: add driver for Zynq uarts Josh Cartwright
2013-03-03  7:16   ` Antony Pavlov
2013-03-03 14:55     ` Josh Cartwright
2013-03-03 10:37   ` Jean-Christophe PLAGNIOL-VILLARD
2013-03-03 10:37   ` Jean-Christophe PLAGNIOL-VILLARD
2013-03-03  0:48 ` [PATCH 4/5] ARM: zynq: add support for Zynq 7000 SoC Josh Cartwright
2013-03-03  7:24   ` Antony Pavlov [this message]
2013-03-05 17:22     ` Josh Cartwright
2013-03-05 19:08       ` Sascha Hauer
2013-03-03  0:48 ` [PATCH 5/5] ARM: zynq: add support for zc702 development board Josh Cartwright
2013-03-03 10:39   ` Jean-Christophe PLAGNIOL-VILLARD
2013-03-05 17:16     ` Josh Cartwright
2013-03-05 18:02       ` Jean-Christophe PLAGNIOL-VILLARD
2013-03-03 14:58 ` [PATCH 0/5] Zynq support for barebox Steffen Trumtrar
2013-03-05 17:09   ` Josh Cartwright
2013-03-06 17:28     ` Steffen Trumtrar
2013-03-07 22:46       ` Josh Cartwright
2013-03-08  6:39         ` Steffen Trumtrar
2013-03-08 12:20           ` Michal Simek
2013-03-08 19:31             ` Steffen Trumtrar
2013-03-08 16:10           ` Josh Cartwright
2013-03-08 16:11             ` Steffen Trumtrar
2013-03-08 16:10           ` Jean-Christophe PLAGNIOL-VILLARD

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