[PATCH 0/3] ARM: OMAP2+: Convert OMAP3 I2C to ti-sysc

[PATCH 0/3] ARM: OMAP2+: Convert OMAP3 I2C to ti-sysc

[Andreas Kemnade]

During suspend on OMAP3, I2C suspend oopses. This is a longer standing issue,
in the past I mostly tested runtime suspendidle behaviour on that platform
(including uart autosuspend). A change in the I2C driver fixes some corner
cases in pm for ti-sysc based systems, but breaks systems using the deprecated
ti,hwmods property. 
To avoid that maintainance overhead, convert the i2c definition
First fix the I2C quirk needed for these older chips. OMAP2 stuff
is not touched due to its planned removal.
After OMAP2 is removed, arch/arm/mach-omap2/i2c.c can be removed, too.
I may try to check again if there is some safe fix in omap_device.c
but changing things there has a very high chance of unexpected side
effects.

Handling the commits:
In the past (e.g. around commit
42a79edd4a3dc1bb8e89fd2849f9e8e1e1c13977 for converting musb to ti-sys)
these changes were handled through a separate branch to keep them in
order.
Here is a hard requirement of the order. Patch 3 can most easily wait
but having patch 2 after patch 1 is a hard requirement. As the
affected devices get their devicetree updated with the kernel,
that should not hurt too much.

Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
---
Andreas Kemnade (3):
      bus: ti-sysc: fix I2C quirk for OMAP3 variants
      ARM: dts: ti/omap: describe omap3 i2c via ti-sysc
      ARM: OMAP2+: remove i2c from OMAP3 hwmods list

 arch/arm/boot/dts/ti/omap/omap3.dtsi       |  96 ++++++++++++++++++++-----
 arch/arm/mach-omap2/omap_hwmod_3xxx_data.c | 112 -----------------------------
 drivers/bus/ti-sysc.c                      |  19 +++--
 3 files changed, 91 insertions(+), 136 deletions(-)
---
base-commit: 7475ea8b58616b33c04afb976cf0fbaad9dd63fb
change-id: 20261109-i2c-sysc-a048409add7c

Best regards,
--  
Andreas Kemnade <andreas@kemnade.info>

[PATCH 1/3] bus: ti-sysc: fix I2C quirk for OMAP3 variants

[Andreas Kemnade]

OMAP3 has only one revision register, not split across two registers.
Do not try to interpret the interrupt enable register but instead
use the size of the revision register as indicator.
Specifying a fake 8 byte range and the original quirk only works if
u-boot has not messed around with the interrupt enable register.

Fixes: 4e23be473e306 ("bus: ti-sysc: Add support for module specific reset quirks")
Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
---
 drivers/bus/ti-sysc.c | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c
index 12285ad9ef51f..c07a0e1f9a878 100644
--- a/drivers/bus/ti-sysc.c
+++ b/drivers/bus/ti-sysc.c
@@ -153,6 +153,7 @@ struct sysc {
 	struct ti_sysc_cookie cookie;
 	const char *name;
 	u32 revision;
+	bool revision_doubleword;
 	u32 sysconfig;
 	unsigned int reserved:1;
 	unsigned int enabled:1;
@@ -179,7 +180,8 @@ static void sysc_write(struct sysc *ddata, int offset, u32 value)
 
 		/* Only i2c revision has LO and HI register with stride of 4 */
 		if (ddata->offsets[SYSC_REVISION] >= 0 &&
-		    offset == ddata->offsets[SYSC_REVISION]) {
+		    offset == ddata->offsets[SYSC_REVISION] &&
+		    ddata->revision_doubleword) {
 			u16 hi = value >> 16;
 
 			writew_relaxed(hi, ddata->module_va + offset + 4);
@@ -200,7 +202,8 @@ static u32 sysc_read(struct sysc *ddata, int offset)
 
 		/* Only i2c revision has LO and HI register with stride of 4 */
 		if (ddata->offsets[SYSC_REVISION] >= 0 &&
-		    offset == ddata->offsets[SYSC_REVISION]) {
+		    offset == ddata->offsets[SYSC_REVISION] &&
+		    ddata->revision_doubleword) {
 			u16 tmp = readw_relaxed(ddata->module_va + offset + 4);
 
 			val |= tmp << 16;
@@ -761,8 +764,10 @@ static void sysc_check_children(struct sysc *ddata)
  */
 static void sysc_check_quirk_16bit(struct sysc *ddata, struct resource *res)
 {
-	if (resource_size(res) == 8)
+	if (resource_size(res) == 8) {
 		ddata->cfg.quirks |= SYSC_QUIRK_16BIT | SYSC_QUIRK_USE_CLOCKACT;
+		ddata->revision_doubleword = true;
+	}
 }
 
 /**
@@ -1527,9 +1532,11 @@ static const struct sysc_revision_quirk sysc_revision_quirks[] = {
 	SYSC_QUIRK("i2c", 0, 0, 0x20, 0x10, 0x00000036, 0x000000ff,
 		   SYSC_MODULE_QUIRK_I2C | SYSC_MODULE_QUIRK_ENA_RESETDONE),
 	SYSC_QUIRK("i2c", 0, 0, 0x20, 0x10, 0x0000003c, 0x000000ff,
-		   SYSC_MODULE_QUIRK_I2C | SYSC_MODULE_QUIRK_ENA_RESETDONE),
+		   SYSC_MODULE_QUIRK_I2C | SYSC_MODULE_QUIRK_ENA_RESETDONE |
+		   SYSC_QUIRK_16BIT | SYSC_QUIRK_USE_CLOCKACT),
 	SYSC_QUIRK("i2c", 0, 0, 0x20, 0x10, 0x00000040, 0x000000ff,
-		   SYSC_MODULE_QUIRK_I2C | SYSC_MODULE_QUIRK_ENA_RESETDONE),
+		   SYSC_MODULE_QUIRK_I2C | SYSC_MODULE_QUIRK_ENA_RESETDONE |
+		   SYSC_QUIRK_16BIT | SYSC_QUIRK_USE_CLOCKACT),
 	SYSC_QUIRK("i2c", 0, 0, 0x10, 0x90, 0x5040000a, 0xfffff0f0,
 		   SYSC_MODULE_QUIRK_I2C | SYSC_MODULE_QUIRK_ENA_RESETDONE),
 	SYSC_QUIRK("gpu", 0x50000000, 0x14, -ENODEV, -ENODEV, 0x00010201, 0xffffffff, 0),
@@ -1872,7 +1879,7 @@ static void sysc_clk_quirk_i2c(struct sysc *ddata, bool enable)
 	u16 val;
 
 	/* I2C_CON, omap2/3 is different from omap4 and later */
-	if ((ddata->revision & 0xffffff00) == 0x001f0000)
+	if (!ddata->revision_doubleword)
 		offset = 0x24;
 	else
 		offset = 0xa4;

-- 
2.47.3

Re: [PATCH 1/3] bus: ti-sysc: fix I2C quirk for OMAP3 variants

[kernel test robot]

Hi Andreas,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 7475ea8b58616b33c04afb976cf0fbaad9dd63fb]

url:    https://github.com/intel-lab-lkp/linux/commits/Andreas-Kemnade/bus-ti-sysc-fix-I2C-quirk-for-OMAP3-variants/20261110-114612
base:   7475ea8b58616b33c04afb976cf0fbaad9dd63fb
patch link:    https://lore.kernel.org/r/20261110-i2c-sysc-v1-1-8945eb1d38f0%40kemnade.info
patch subject: [PATCH 1/3] bus: ti-sysc: fix I2C quirk for OMAP3 variants
config: arm64-randconfig-1000-20261110 (https://download.01.org/0day-ci/archive/20261111/202611110448.h78DkY1D-lkp@intel.com/config)
compiler: clang version 24.0.0git (https://github.com/llvm/llvm-project e73e336290028f26553b46c9fba844c13da38c9c)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261111/202611110448.h78DkY1D-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202611110448.h78DkY1D-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> Warning: drivers/bus/ti-sysc.c:169 struct member 'revision_doubleword' not described in 'sysc'
>> Warning: drivers/bus/ti-sysc.c:169 struct member 'revision_doubleword' not described in 'sysc'

--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

[PATCH 2/3] ARM: dts: ti/omap: describe omap3 i2c via ti-sysc

[Andreas Kemnade]

ti,hwmods is deprecated, and the power management there is working a bit
different than the one in the ti-sysc way. So if something is changed
with pm incfluence, it has to be tested on both. To reduce that maintenance
work, convert to ti-sysc. Also fixes an actual crash with OMAP3 and
suspend.  That was caused by a commit enabling i2c access in later phases
of suspend until the noirq phase. But that causes some state expectation
mismatch between omap_device.c code and the i2c code leading to the
following:

Unhandled fault: external abort on non-linefetch (0x1028) at 0xfa060004
[...]
PC is at omap_i2c_runtime_suspend+0x1c/0xd8
[...]
Call trace:
omap_i2c_runtime_suspend from _od_suspend_noirq+0x44/0xe0
_od_suspend_noirq from dpm_run_callback+0x4c/0x1f0
dpm_run_callback from device_suspend_noirq+0x208/0x594
device_suspend_noirq from dpm_suspend_noirq+0x1c8/0x3a4
dpm_suspend_noirq from suspend_devices_and_enter+0x10c/0x840
suspend_devices_and_enter from pm_suspend+0x25c/0x3fc
pm_suspend from state_store+0x114/0x130

Fixes: 7da7fd7e66ac9 ("i2c: omap: wakeup the controller during suspend() callback")
Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
---
 arch/arm/boot/dts/ti/omap/omap3.dtsi | 96 +++++++++++++++++++++++++++++-------
 1 file changed, 78 insertions(+), 18 deletions(-)

diff --git a/arch/arm/boot/dts/ti/omap/omap3.dtsi b/arch/arm/boot/dts/ti/omap/omap3.dtsi
index 447736d2e53ca..42d80c7a0a854 100644
--- a/arch/arm/boot/dts/ti/omap/omap3.dtsi
+++ b/arch/arm/boot/dts/ti/omap/omap3.dtsi
@@ -396,31 +396,91 @@ uart3: serial@49020000 {
 			clock-frequency = <48000000>;
 		};
 
-		i2c1: i2c@48070000 {
-			compatible = "ti,omap3-i2c";
-			reg = <0x48070000 0x80>;
-			interrupts = <56>;
+		i2c1_target: target-module@48070000 {
+			compatible = "ti,sysc-omap2", "ti,sysc";
+			reg = <0x48070000 0x4>,
+			      <0x48070020 0x4>,
+			      <0x48070010 0x4>;
+			reg-names = "rev", "sysc", "syss";
+			ti,sysc-mask = <(SYSC_OMAP2_CLOCKACTIVITY |
+					 SYSC_OMAP2_ENAWAKEUP |
+					 SYSC_OMAP2_SOFTRESET |
+					 SYSC_OMAP2_AUTOIDLE)>;
+			ti-sysc-sidle = <SYSC_IDLE_FORCE>,
+					<SYSC_IDLE_NO>,
+					<SYSC_IDLE_SMART>;
+			ti,syss-mask = <1>;
+			clocks = <&i2c1_fck>, <&i2c1_ick>;
+			clock-names = "fck", "ick";
 			#address-cells = <1>;
-			#size-cells = <0>;
-			ti,hwmods = "i2c1";
+			#size-cells = <1>;
+			ranges = <0 0x48070000 0x1000>;
+
+			i2c1: i2c@0 {
+				compatible = "ti,omap3-i2c";
+				reg = <0x0 0x80>;
+				interrupts = <56>;
+				#address-cells = <1>;
+				#size-cells = <0>;
+			};
 		};
 
-		i2c2: i2c@48072000 {
-			compatible = "ti,omap3-i2c";
-			reg = <0x48072000 0x80>;
-			interrupts = <57>;
+		i2c2_target: target-module@48072000 {
+			compatible = "ti,sysc-omap2", "ti,sysc";
+			reg = <0x48072000 0x4>,
+			      <0x48072020 0x4>,
+			      <0x48072010 0x4>;
+			reg-names = "rev", "sysc", "syss";
+			ti,sysc-mask = <(SYSC_OMAP2_CLOCKACTIVITY |
+					 SYSC_OMAP2_ENAWAKEUP |
+					 SYSC_OMAP2_SOFTRESET |
+					 SYSC_OMAP2_AUTOIDLE)>;
+			ti-sysc-sidle = <SYSC_IDLE_FORCE>,
+					<SYSC_IDLE_NO>,
+					<SYSC_IDLE_SMART>;
+			ti,syss-mask = <1>;
+			clocks = <&i2c2_fck>, <&i2c2_ick>;
+			clock-names = "fck", "ick";
 			#address-cells = <1>;
-			#size-cells = <0>;
-			ti,hwmods = "i2c2";
+			#size-cells = <1>;
+			ranges = <0 0x48072000 0x1000>;
+
+			i2c2: i2c@0 {
+				compatible = "ti,omap3-i2c";
+				reg = <0x0 0x80>;
+				interrupts = <57>;
+				#address-cells = <1>;
+				#size-cells = <0>;
+			};
 		};
 
-		i2c3: i2c@48060000 {
-			compatible = "ti,omap3-i2c";
-			reg = <0x48060000 0x80>;
-			interrupts = <61>;
+		i2c3_target: target-module@48060000 {
+			compatible = "ti,sysc-omap2", "ti,sysc";
+			reg = <0x48060000 0x4>,
+			      <0x48060020 0x4>,
+			      <0x48060010 0x4>;
+			reg-names = "rev", "sysc", "syss";
+			ti,sysc-mask = <(SYSC_OMAP2_CLOCKACTIVITY |
+					 SYSC_OMAP2_ENAWAKEUP |
+					 SYSC_OMAP2_SOFTRESET |
+					 SYSC_OMAP2_AUTOIDLE)>;
+			ti-sysc-sidle = <SYSC_IDLE_FORCE>,
+					<SYSC_IDLE_NO>,
+					<SYSC_IDLE_SMART>;
+			ti,syss-mask = <1>;
+			clocks = <&i2c3_fck>, <&i2c3_ick>;
+			clock-names = "fck", "ick";
 			#address-cells = <1>;
-			#size-cells = <0>;
-			ti,hwmods = "i2c3";
+			#size-cells = <1>;
+			ranges = <0 0x48060000 0x1000>;
+
+			i2c3: i2c@0 {
+				compatible = "ti,omap3-i2c";
+				reg = <0x0 0x80>;
+				interrupts = <61>;
+				#address-cells = <1>;
+				#size-cells = <0>;
+			};
 		};
 
 		mailbox: mailbox@48094000 {

-- 
2.47.3

[PATCH 3/3] ARM: OMAP2+: remove i2c from OMAP3 hwmods list

[Andreas Kemnade]

Not need anymore due to ti-sysc transition, so clean up here.

Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
---
 arch/arm/mach-omap2/omap_hwmod_3xxx_data.c | 112 -----------------------------
 1 file changed, 112 deletions(-)

diff --git a/arch/arm/mach-omap2/omap_hwmod_3xxx_data.c b/arch/arm/mach-omap2/omap_hwmod_3xxx_data.c
index 5cbdf58ad59f7..022019ff4a398 100644
--- a/arch/arm/mach-omap2/omap_hwmod_3xxx_data.c
+++ b/arch/arm/mach-omap2/omap_hwmod_3xxx_data.c
@@ -299,18 +299,6 @@ static struct omap_hwmod_class_sysconfig omap3xxx_wd_timer_sysc = {
 	.sysc_fields    = &omap_hwmod_sysc_type1,
 };
 
-/* I2C common */
-static struct omap_hwmod_class_sysconfig i2c_sysc = {
-	.rev_offs	= 0x00,
-	.sysc_offs	= 0x20,
-	.syss_offs	= 0x10,
-	.sysc_flags	= (SYSC_HAS_CLOCKACTIVITY | SYSC_HAS_SIDLEMODE |
-			   SYSC_HAS_ENAWAKEUP | SYSC_HAS_SOFTRESET |
-			   SYSC_HAS_AUTOIDLE | SYSS_HAS_RESET_STATUS),
-	.idlemodes	= (SIDLE_FORCE | SIDLE_NO | SIDLE_SMART),
-	.sysc_fields    = &omap_hwmod_sysc_type1,
-};
-
 static struct omap_hwmod_class omap3xxx_wd_timer_hwmod_class = {
 	.name		= "wd_timer",
 	.sysc		= &omap3xxx_wd_timer_sysc,
@@ -431,12 +419,6 @@ static struct omap_hwmod am35xx_uart4_hwmod = {
 	.class		= &omap2_uart_class,
 };
 
-static struct omap_hwmod_class i2c_class = {
-	.name	= "i2c",
-	.sysc	= &i2c_sysc,
-	.reset	= &omap_i2c_reset,
-};
-
 /* dss */
 static struct omap_hwmod_opt_clk dss_opt_clks[] = {
 	/*
@@ -592,51 +574,6 @@ static struct omap_hwmod omap3xxx_dss_venc_hwmod = {
 	.flags		= HWMOD_NO_IDLEST,
 };
 
-/* I2C1 */
-static struct omap_hwmod omap3xxx_i2c1_hwmod = {
-	.name		= "i2c1",
-	.flags		= HWMOD_16BIT_REG | HWMOD_SET_DEFAULT_CLOCKACT,
-	.main_clk	= "i2c1_fck",
-	.prcm		= {
-		.omap2 = {
-			.module_offs = CORE_MOD,
-			.idlest_reg_id = 1,
-			.idlest_idle_bit = OMAP3430_ST_I2C1_SHIFT,
-		},
-	},
-	.class		= &i2c_class,
-};
-
-/* I2C2 */
-static struct omap_hwmod omap3xxx_i2c2_hwmod = {
-	.name		= "i2c2",
-	.flags		= HWMOD_16BIT_REG | HWMOD_SET_DEFAULT_CLOCKACT,
-	.main_clk	= "i2c2_fck",
-	.prcm		= {
-		.omap2 = {
-			.module_offs = CORE_MOD,
-			.idlest_reg_id = 1,
-			.idlest_idle_bit = OMAP3430_ST_I2C2_SHIFT,
-		},
-	},
-	.class		= &i2c_class,
-};
-
-/* I2C3 */
-static struct omap_hwmod omap3xxx_i2c3_hwmod = {
-	.name		= "i2c3",
-	.flags		= HWMOD_16BIT_REG | HWMOD_SET_DEFAULT_CLOCKACT,
-	.main_clk	= "i2c3_fck",
-	.prcm		= {
-		.omap2 = {
-			.module_offs = CORE_MOD,
-			.idlest_reg_id = 1,
-			.idlest_idle_bit = OMAP3430_ST_I2C3_SHIFT,
-		},
-	},
-	.class		= &i2c_class,
-};
-
 /*
  * 'gpio' class
  * general purpose io module
@@ -1605,52 +1542,6 @@ static struct omap_hwmod_ocp_if am35xx_l4_core__uart4 = {
 	.user		= OCP_USER_MPU | OCP_USER_SDMA,
 };
 
-/* L4 CORE -> I2C1 interface */
-static struct omap_hwmod_ocp_if omap3_l4_core__i2c1 = {
-	.master		= &omap3xxx_l4_core_hwmod,
-	.slave		= &omap3xxx_i2c1_hwmod,
-	.clk		= "i2c1_ick",
-	.fw = {
-		.omap2 = {
-			.l4_fw_region  = OMAP3_L4_CORE_FW_I2C1_REGION,
-			.l4_prot_group = 7,
-			.flags	= OMAP_FIREWALL_L4,
-		},
-	},
-	.user		= OCP_USER_MPU | OCP_USER_SDMA,
-};
-
-/* L4 CORE -> I2C2 interface */
-static struct omap_hwmod_ocp_if omap3_l4_core__i2c2 = {
-	.master		= &omap3xxx_l4_core_hwmod,
-	.slave		= &omap3xxx_i2c2_hwmod,
-	.clk		= "i2c2_ick",
-	.fw = {
-		.omap2 = {
-			.l4_fw_region  = OMAP3_L4_CORE_FW_I2C2_REGION,
-			.l4_prot_group = 7,
-			.flags = OMAP_FIREWALL_L4,
-		},
-	},
-	.user		= OCP_USER_MPU | OCP_USER_SDMA,
-};
-
-/* L4 CORE -> I2C3 interface */
-
-static struct omap_hwmod_ocp_if omap3_l4_core__i2c3 = {
-	.master		= &omap3xxx_l4_core_hwmod,
-	.slave		= &omap3xxx_i2c3_hwmod,
-	.clk		= "i2c3_ick",
-	.fw = {
-		.omap2 = {
-			.l4_fw_region  = OMAP3_L4_CORE_FW_I2C3_REGION,
-			.l4_prot_group = 7,
-			.flags = OMAP_FIREWALL_L4,
-		},
-	},
-	.user		= OCP_USER_MPU | OCP_USER_SDMA,
-};
-
 /* L4 CORE -> SR1 interface */
 static struct omap_hwmod_ocp_if omap34xx_l4_core__sr1 = {
 	.master		= &omap3xxx_l4_core_hwmod,
@@ -2300,9 +2191,6 @@ static struct omap_hwmod_ocp_if *omap3xxx_hwmod_ocp_ifs[] __initdata = {
 	&omap3_l4_core__uart1,
 	&omap3_l4_core__uart2,
 	&omap3_l4_per__uart3,
-	&omap3_l4_core__i2c1,
-	&omap3_l4_core__i2c2,
-	&omap3_l4_core__i2c3,
 	&omap3xxx_l4_wkup__l4_sec,
 	&omap3xxx_l4_per__timer3,
 	&omap3xxx_l4_per__timer4,

-- 
2.47.3