[v2,2/6] clk: sifive: Use reset-simple in prci driver for PCIe driver
diff mbox series

Message ID 91d016e59bab9d9175168a63e7bcd81fdb69b549.1615954046.git.greentime.hu@sifive.com
State New, archived
Headers show
Series
  • Add SiFive FU740 PCIe host controller driver support
Related show

Commit Message

Greentime Hu March 18, 2021, 6:08 a.m. UTC
We use reset-simple in this patch so that pcie driver can use
devm_reset_control_get() to get this reset data structure and use
reset_control_deassert() to deassert pcie_power_up_rst_n.

Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Greentime Hu <greentime.hu@sifive.com>
---
 drivers/clk/sifive/Kconfig       |  2 ++
 drivers/clk/sifive/sifive-prci.c | 13 +++++++++++++
 drivers/clk/sifive/sifive-prci.h |  4 ++++
 drivers/reset/Kconfig            |  3 ++-
 4 files changed, 21 insertions(+), 1 deletion(-)

Comments

Stephen Boyd March 29, 2021, 7:14 p.m. UTC | #1
Quoting Greentime Hu (2021-03-17 23:08:09)
> diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
> index 71ab75a46491..f094df93d911 100644
> --- a/drivers/reset/Kconfig
> +++ b/drivers/reset/Kconfig
> @@ -173,7 +173,7 @@ config RESET_SCMI
>  
>  config RESET_SIMPLE
>         bool "Simple Reset Controller Driver" if COMPILE_TEST
> -       default ARCH_AGILEX || ARCH_ASPEED || ARCH_BITMAIN || ARCH_REALTEK || ARCH_STM32 || ARCH_STRATIX10 || ARCH_SUNXI || ARCH_ZX || ARC
> +       default ARCH_AGILEX || ARCH_ASPEED || ARCH_BITMAIN || ARCH_REALTEK || ARCH_STM32 || ARCH_STRATIX10 || ARCH_SUNXI || ARCH_ZX || ARC || RISCV

This conflicts. Can this default be part of the riscv defconfig instead?

>         help
>           This enables a simple reset controller driver for reset lines that
>           that can be asserted and deasserted by toggling bits in a contiguous,
> @@ -187,6 +187,7 @@ config RESET_SIMPLE
>            - RCC reset controller in STM32 MCUs
>            - Allwinner SoCs
>            - ZTE's zx2967 family
> +          - SiFive FU740 SoCs
>  
>  config RESET_STM32MP157
>         bool "STM32MP157 Reset Driver" if COMPILE_TEST
Greentime Hu March 30, 2021, 3:36 a.m. UTC | #2
Stephen Boyd <sboyd@kernel.org> 於 2021年3月30日 週二 上午3:14寫道:
>
> Quoting Greentime Hu (2021-03-17 23:08:09)
> > diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
> > index 71ab75a46491..f094df93d911 100644
> > --- a/drivers/reset/Kconfig
> > +++ b/drivers/reset/Kconfig
> > @@ -173,7 +173,7 @@ config RESET_SCMI
> >
> >  config RESET_SIMPLE
> >         bool "Simple Reset Controller Driver" if COMPILE_TEST
> > -       default ARCH_AGILEX || ARCH_ASPEED || ARCH_BITMAIN || ARCH_REALTEK || ARCH_STM32 || ARCH_STRATIX10 || ARCH_SUNXI || ARCH_ZX || ARC
> > +       default ARCH_AGILEX || ARCH_ASPEED || ARCH_BITMAIN || ARCH_REALTEK || ARCH_STM32 || ARCH_STRATIX10 || ARCH_SUNXI || ARCH_ZX || ARC || RISCV
>
> This conflicts. Can this default be part of the riscv defconfig instead?
>

Maybe I should remove this since it has been selected by CLK_SIFIVE_PRCI?

 config CLK_SIFIVE_PRCI
        bool "PRCI driver for SiFive SoCs"
+       select RESET_CONTROLLER
+       select RESET_SIMPLE

> >         help
> >           This enables a simple reset controller driver for reset lines that
> >           that can be asserted and deasserted by toggling bits in a contiguous,
> > @@ -187,6 +187,7 @@ config RESET_SIMPLE
> >            - RCC reset controller in STM32 MCUs
> >            - Allwinner SoCs
> >            - ZTE's zx2967 family
> > +          - SiFive FU740 SoCs
> >
> >  config RESET_STM32MP157
> >         bool "STM32MP157 Reset Driver" if COMPILE_TEST
Palmer Dabbelt March 31, 2021, 12:24 a.m. UTC | #3
On Mon, 29 Mar 2021 20:36:12 PDT (-0700), greentime.hu@sifive.com wrote:
> Stephen Boyd <sboyd@kernel.org> 於 2021年3月30日 週二 上午3:14寫道:
>>
>> Quoting Greentime Hu (2021-03-17 23:08:09)
>> > diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
>> > index 71ab75a46491..f094df93d911 100644
>> > --- a/drivers/reset/Kconfig
>> > +++ b/drivers/reset/Kconfig
>> > @@ -173,7 +173,7 @@ config RESET_SCMI
>> >
>> >  config RESET_SIMPLE
>> >         bool "Simple Reset Controller Driver" if COMPILE_TEST
>> > -       default ARCH_AGILEX || ARCH_ASPEED || ARCH_BITMAIN || ARCH_REALTEK || ARCH_STM32 || ARCH_STRATIX10 || ARCH_SUNXI || ARCH_ZX || ARC
>> > +       default ARCH_AGILEX || ARCH_ASPEED || ARCH_BITMAIN || ARCH_REALTEK || ARCH_STM32 || ARCH_STRATIX10 || ARCH_SUNXI || ARCH_ZX || ARC || RISCV
>>
>> This conflicts. Can this default be part of the riscv defconfig instead?
>>
>
> Maybe I should remove this since it has been selected by CLK_SIFIVE_PRCI?
>
>  config CLK_SIFIVE_PRCI
>         bool "PRCI driver for SiFive SoCs"
> +       select RESET_CONTROLLER
> +       select RESET_SIMPLE

Ya, that's better.  IIRC I suggested something similar in some other 
version, but I might have not actually sent the mail.

>
>> >         help
>> >           This enables a simple reset controller driver for reset lines that
>> >           that can be asserted and deasserted by toggling bits in a contiguous,
>> > @@ -187,6 +187,7 @@ config RESET_SIMPLE
>> >            - RCC reset controller in STM32 MCUs
>> >            - Allwinner SoCs
>> >            - ZTE's zx2967 family
>> > +          - SiFive FU740 SoCs
>> >
>> >  config RESET_STM32MP157
>> >         bool "STM32MP157 Reset Driver" if COMPILE_TEST

Patch
diff mbox series

diff --git a/drivers/clk/sifive/Kconfig b/drivers/clk/sifive/Kconfig
index 1c14eb20c066..9132c3c4aa86 100644
--- a/drivers/clk/sifive/Kconfig
+++ b/drivers/clk/sifive/Kconfig
@@ -10,6 +10,8 @@  if CLK_SIFIVE
 
 config CLK_SIFIVE_PRCI
 	bool "PRCI driver for SiFive SoCs"
+	select RESET_CONTROLLER
+	select RESET_SIMPLE
 	select CLK_ANALOGBITS_WRPLL_CLN28HPC
 	help
 	  Supports the Power Reset Clock interface (PRCI) IP block found in
diff --git a/drivers/clk/sifive/sifive-prci.c b/drivers/clk/sifive/sifive-prci.c
index baf7313dac92..871ccb287993 100644
--- a/drivers/clk/sifive/sifive-prci.c
+++ b/drivers/clk/sifive/sifive-prci.c
@@ -583,6 +583,19 @@  static int sifive_prci_probe(struct platform_device *pdev)
 	if (IS_ERR(pd->va))
 		return PTR_ERR(pd->va);
 
+	pd->reset.rcdev.owner = THIS_MODULE;
+	pd->reset.rcdev.nr_resets = PRCI_RST_NR;
+	pd->reset.rcdev.ops = &reset_simple_ops;
+	pd->reset.rcdev.of_node = pdev->dev.of_node;
+	pd->reset.active_low = true;
+	pd->reset.membase = pd->va + PRCI_DEVICESRESETREG_OFFSET;
+	spin_lock_init(&pd->reset.lock);
+
+	r = devm_reset_controller_register(&pdev->dev, &pd->reset.rcdev);
+	if (r) {
+		dev_err(dev, "could not register reset controller: %d\n", r);
+		return r;
+	}
 	r = __prci_register_clocks(dev, pd, desc);
 	if (r) {
 		dev_err(dev, "could not register clocks: %d\n", r);
diff --git a/drivers/clk/sifive/sifive-prci.h b/drivers/clk/sifive/sifive-prci.h
index 022c67cf053c..91658a88af4e 100644
--- a/drivers/clk/sifive/sifive-prci.h
+++ b/drivers/clk/sifive/sifive-prci.h
@@ -11,6 +11,7 @@ 
 
 #include <linux/clk/analogbits-wrpll-cln28hpc.h>
 #include <linux/clk-provider.h>
+#include <linux/reset/reset-simple.h>
 #include <linux/platform_device.h>
 
 /*
@@ -121,6 +122,8 @@ 
 #define PRCI_DEVICESRESETREG_CHIPLINK_RST_N_MASK			\
 		(0x1 << PRCI_DEVICESRESETREG_CHIPLINK_RST_N_SHIFT)
 
+#define PRCI_RST_NR						7
+
 /* CLKMUXSTATUSREG */
 #define PRCI_CLKMUXSTATUSREG_OFFSET				0x2c
 #define PRCI_CLKMUXSTATUSREG_TLCLKSEL_STATUS_SHIFT		1
@@ -221,6 +224,7 @@ 
  */
 struct __prci_data {
 	void __iomem *va;
+	struct reset_simple_data reset;
 	struct clk_hw_onecell_data hw_clks;
 };
 
diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index 71ab75a46491..f094df93d911 100644
--- a/drivers/reset/Kconfig
+++ b/drivers/reset/Kconfig
@@ -173,7 +173,7 @@  config RESET_SCMI
 
 config RESET_SIMPLE
 	bool "Simple Reset Controller Driver" if COMPILE_TEST
-	default ARCH_AGILEX || ARCH_ASPEED || ARCH_BITMAIN || ARCH_REALTEK || ARCH_STM32 || ARCH_STRATIX10 || ARCH_SUNXI || ARCH_ZX || ARC
+	default ARCH_AGILEX || ARCH_ASPEED || ARCH_BITMAIN || ARCH_REALTEK || ARCH_STM32 || ARCH_STRATIX10 || ARCH_SUNXI || ARCH_ZX || ARC || RISCV
 	help
 	  This enables a simple reset controller driver for reset lines that
 	  that can be asserted and deasserted by toggling bits in a contiguous,
@@ -187,6 +187,7 @@  config RESET_SIMPLE
 	   - RCC reset controller in STM32 MCUs
 	   - Allwinner SoCs
 	   - ZTE's zx2967 family
+	   - SiFive FU740 SoCs
 
 config RESET_STM32MP157
 	bool "STM32MP157 Reset Driver" if COMPILE_TEST