+++ /dev/null
-From 872f91b5ea720c72f81fb46d353c43ecb3263ffa Mon Sep 17 00:00:00 2001
-From: Georgi Djakov <georgi.djakov@linaro.org>
-Date: Wed, 2 Nov 2016 17:56:57 +0200
-Subject: clk: qcom: Add support for RPM Clocks
-
-This adds initial support for clocks controlled by the Resource
-Power Manager (RPM) processor on some Qualcomm SoCs, which use
-the qcom_rpm driver to communicate with RPM.
-Such platforms are apq8064 and msm8960.
-
-Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
-Acked-by: Rob Herring <robh@kernel.org>
-Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
----
- .../devicetree/bindings/clock/qcom,rpmcc.txt | 1 +
- drivers/clk/qcom/Kconfig | 13 +
- drivers/clk/qcom/Makefile | 1 +
- drivers/clk/qcom/clk-rpm.c | 489 +++++++++++++++++++++
- include/dt-bindings/clock/qcom,rpmcc.h | 24 +
- 5 files changed, 528 insertions(+)
- create mode 100644 drivers/clk/qcom/clk-rpm.c
-
---- a/Documentation/devicetree/bindings/clock/qcom,rpmcc.txt
-+++ b/Documentation/devicetree/bindings/clock/qcom,rpmcc.txt
-@@ -11,6 +11,7 @@ Required properties :
- compatible "qcom,rpmcc" should be also included.
-
- "qcom,rpmcc-msm8916", "qcom,rpmcc"
-+ "qcom,rpmcc-apq8064", "qcom,rpmcc"
-
- - #clock-cells : shall contain 1
-
---- a/drivers/clk/qcom/Kconfig
-+++ b/drivers/clk/qcom/Kconfig
-@@ -12,6 +12,19 @@ config COMMON_CLK_QCOM
- select REGMAP_MMIO
- select RESET_CONTROLLER
-
-+config QCOM_CLK_RPM
-+ tristate "RPM based Clock Controller"
-+ depends on COMMON_CLK_QCOM && MFD_QCOM_RPM
-+ select QCOM_RPMCC
-+ help
-+ The RPM (Resource Power Manager) is a dedicated hardware engine for
-+ managing the shared SoC resources in order to keep the lowest power
-+ profile. It communicates with other hardware subsystems via shared
-+ memory and accepts clock requests, aggregates the requests and turns
-+ the clocks on/off or scales them on demand.
-+ Say Y if you want to support the clocks exposed by the RPM on
-+ platforms such as ipq806x, msm8660, msm8960 etc.
-+
- config QCOM_CLK_SMD_RPM
- tristate "RPM over SMD based Clock Controller"
- depends on COMMON_CLK_QCOM && QCOM_SMD_RPM
---- a/drivers/clk/qcom/Makefile
-+++ b/drivers/clk/qcom/Makefile
-@@ -23,3 +23,4 @@ obj-$(CONFIG_MSM_GCC_8974) += gcc-msm897
- obj-$(CONFIG_MSM_MMCC_8960) += mmcc-msm8960.o
- obj-$(CONFIG_MSM_MMCC_8974) += mmcc-msm8974.o
- obj-$(CONFIG_QCOM_CLK_SMD_RPM) += clk-smd-rpm.o
-+obj-$(CONFIG_QCOM_CLK_RPM) += clk-rpm.o
---- /dev/null
-+++ b/drivers/clk/qcom/clk-rpm.c
-@@ -0,0 +1,489 @@
-+/*
-+ * Copyright (c) 2016, Linaro Limited
-+ * Copyright (c) 2014, The Linux Foundation. All rights reserved.
-+ *
-+ * This software is licensed under the terms of the GNU General Public
-+ * License version 2, as published by the Free Software Foundation, and
-+ * may be copied, distributed, and modified under those terms.
-+ *
-+ * 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.
-+ */
-+
-+#include <linux/clk-provider.h>
-+#include <linux/err.h>
-+#include <linux/export.h>
-+#include <linux/init.h>
-+#include <linux/kernel.h>
-+#include <linux/module.h>
-+#include <linux/mutex.h>
-+#include <linux/mfd/qcom_rpm.h>
-+#include <linux/of.h>
-+#include <linux/of_device.h>
-+#include <linux/platform_device.h>
-+
-+#include <dt-bindings/mfd/qcom-rpm.h>
-+#include <dt-bindings/clock/qcom,rpmcc.h>
-+
-+#define QCOM_RPM_MISC_CLK_TYPE 0x306b6c63
-+#define QCOM_RPM_SCALING_ENABLE_ID 0x2
-+
-+#define DEFINE_CLK_RPM(_platform, _name, _active, r_id) \
-+ static struct clk_rpm _platform##_##_active; \
-+ static struct clk_rpm _platform##_##_name = { \
-+ .rpm_clk_id = (r_id), \
-+ .peer = &_platform##_##_active, \
-+ .rate = INT_MAX, \
-+ .hw.init = &(struct clk_init_data){ \
-+ .ops = &clk_rpm_ops, \
-+ .name = #_name, \
-+ .parent_names = (const char *[]){ "pxo_board" }, \
-+ .num_parents = 1, \
-+ }, \
-+ }; \
-+ static struct clk_rpm _platform##_##_active = { \
-+ .rpm_clk_id = (r_id), \
-+ .peer = &_platform##_##_name, \
-+ .active_only = true, \
-+ .rate = INT_MAX, \
-+ .hw.init = &(struct clk_init_data){ \
-+ .ops = &clk_rpm_ops, \
-+ .name = #_active, \
-+ .parent_names = (const char *[]){ "pxo_board" }, \
-+ .num_parents = 1, \
-+ }, \
-+ }
-+
-+#define DEFINE_CLK_RPM_PXO_BRANCH(_platform, _name, _active, r_id, r) \
-+ static struct clk_rpm _platform##_##_active; \
-+ static struct clk_rpm _platform##_##_name = { \
-+ .rpm_clk_id = (r_id), \
-+ .active_only = true, \
-+ .peer = &_platform##_##_active, \
-+ .rate = (r), \
-+ .branch = true, \
-+ .hw.init = &(struct clk_init_data){ \
-+ .ops = &clk_rpm_branch_ops, \
-+ .name = #_name, \
-+ .parent_names = (const char *[]){ "pxo_board" }, \
-+ .num_parents = 1, \
-+ }, \
-+ }; \
-+ static struct clk_rpm _platform##_##_active = { \
-+ .rpm_clk_id = (r_id), \
-+ .peer = &_platform##_##_name, \
-+ .rate = (r), \
-+ .branch = true, \
-+ .hw.init = &(struct clk_init_data){ \
-+ .ops = &clk_rpm_branch_ops, \
-+ .name = #_active, \
-+ .parent_names = (const char *[]){ "pxo_board" }, \
-+ .num_parents = 1, \
-+ }, \
-+ }
-+
-+#define DEFINE_CLK_RPM_CXO_BRANCH(_platform, _name, _active, r_id, r) \
-+ static struct clk_rpm _platform##_##_active; \
-+ static struct clk_rpm _platform##_##_name = { \
-+ .rpm_clk_id = (r_id), \
-+ .peer = &_platform##_##_active, \
-+ .rate = (r), \
-+ .branch = true, \
-+ .hw.init = &(struct clk_init_data){ \
-+ .ops = &clk_rpm_branch_ops, \
-+ .name = #_name, \
-+ .parent_names = (const char *[]){ "cxo_board" }, \
-+ .num_parents = 1, \
-+ }, \
-+ }; \
-+ static struct clk_rpm _platform##_##_active = { \
-+ .rpm_clk_id = (r_id), \
-+ .active_only = true, \
-+ .peer = &_platform##_##_name, \
-+ .rate = (r), \
-+ .branch = true, \
-+ .hw.init = &(struct clk_init_data){ \
-+ .ops = &clk_rpm_branch_ops, \
-+ .name = #_active, \
-+ .parent_names = (const char *[]){ "cxo_board" }, \
-+ .num_parents = 1, \
-+ }, \
-+ }
-+
-+#define to_clk_rpm(_hw) container_of(_hw, struct clk_rpm, hw)
-+
-+struct clk_rpm {
-+ const int rpm_clk_id;
-+ const bool active_only;
-+ unsigned long rate;
-+ bool enabled;
-+ bool branch;
-+ struct clk_rpm *peer;
-+ struct clk_hw hw;
-+ struct qcom_rpm *rpm;
-+};
-+
-+struct rpm_cc {
-+ struct qcom_rpm *rpm;
-+ struct clk_hw_onecell_data data;
-+ struct clk_hw *hws[];
-+};
-+
-+struct rpm_clk_desc {
-+ struct clk_rpm **clks;
-+ size_t num_clks;
-+};
-+
-+static DEFINE_MUTEX(rpm_clk_lock);
-+
-+static int clk_rpm_handoff(struct clk_rpm *r)
-+{
-+ int ret;
-+ u32 value = INT_MAX;
-+
-+ ret = qcom_rpm_write(r->rpm, QCOM_RPM_ACTIVE_STATE,
-+ r->rpm_clk_id, &value, 1);
-+ if (ret)
-+ return ret;
-+ ret = qcom_rpm_write(r->rpm, QCOM_RPM_SLEEP_STATE,
-+ r->rpm_clk_id, &value, 1);
-+ if (ret)
-+ return ret;
-+
-+ return 0;
-+}
-+
-+static int clk_rpm_set_rate_active(struct clk_rpm *r, unsigned long rate)
-+{
-+ u32 value = DIV_ROUND_UP(rate, 1000); /* to kHz */
-+
-+ return qcom_rpm_write(r->rpm, QCOM_RPM_ACTIVE_STATE,
-+ r->rpm_clk_id, &value, 1);
-+}
-+
-+static int clk_rpm_set_rate_sleep(struct clk_rpm *r, unsigned long rate)
-+{
-+ u32 value = DIV_ROUND_UP(rate, 1000); /* to kHz */
-+
-+ return qcom_rpm_write(r->rpm, QCOM_RPM_SLEEP_STATE,
-+ r->rpm_clk_id, &value, 1);
-+}
-+
-+static void to_active_sleep(struct clk_rpm *r, unsigned long rate,
-+ unsigned long *active, unsigned long *sleep)
-+{
-+ *active = rate;
-+
-+ /*
-+ * Active-only clocks don't care what the rate is during sleep. So,
-+ * they vote for zero.
-+ */
-+ if (r->active_only)
-+ *sleep = 0;
-+ else
-+ *sleep = *active;
-+}
-+
-+static int clk_rpm_prepare(struct clk_hw *hw)
-+{
-+ struct clk_rpm *r = to_clk_rpm(hw);
-+ struct clk_rpm *peer = r->peer;
-+ unsigned long this_rate = 0, this_sleep_rate = 0;
-+ unsigned long peer_rate = 0, peer_sleep_rate = 0;
-+ unsigned long active_rate, sleep_rate;
-+ int ret = 0;
-+
-+ mutex_lock(&rpm_clk_lock);
-+
-+ /* Don't send requests to the RPM if the rate has not been set. */
-+ if (!r->rate)
-+ goto out;
-+
-+ to_active_sleep(r, r->rate, &this_rate, &this_sleep_rate);
-+
-+ /* Take peer clock's rate into account only if it's enabled. */
-+ if (peer->enabled)
-+ to_active_sleep(peer, peer->rate,
-+ &peer_rate, &peer_sleep_rate);
-+
-+ active_rate = max(this_rate, peer_rate);
-+
-+ if (r->branch)
-+ active_rate = !!active_rate;
-+
-+ ret = clk_rpm_set_rate_active(r, active_rate);
-+ if (ret)
-+ goto out;
-+
-+ sleep_rate = max(this_sleep_rate, peer_sleep_rate);
-+ if (r->branch)
-+ sleep_rate = !!sleep_rate;
-+
-+ ret = clk_rpm_set_rate_sleep(r, sleep_rate);
-+ if (ret)
-+ /* Undo the active set vote and restore it */
-+ ret = clk_rpm_set_rate_active(r, peer_rate);
-+
-+out:
-+ if (!ret)
-+ r->enabled = true;
-+
-+ mutex_unlock(&rpm_clk_lock);
-+
-+ return ret;
-+}
-+
-+static void clk_rpm_unprepare(struct clk_hw *hw)
-+{
-+ struct clk_rpm *r = to_clk_rpm(hw);
-+ struct clk_rpm *peer = r->peer;
-+ unsigned long peer_rate = 0, peer_sleep_rate = 0;
-+ unsigned long active_rate, sleep_rate;
-+ int ret;
-+
-+ mutex_lock(&rpm_clk_lock);
-+
-+ if (!r->rate)
-+ goto out;
-+
-+ /* Take peer clock's rate into account only if it's enabled. */
-+ if (peer->enabled)
-+ to_active_sleep(peer, peer->rate, &peer_rate,
-+ &peer_sleep_rate);
-+
-+ active_rate = r->branch ? !!peer_rate : peer_rate;
-+ ret = clk_rpm_set_rate_active(r, active_rate);
-+ if (ret)
-+ goto out;
-+
-+ sleep_rate = r->branch ? !!peer_sleep_rate : peer_sleep_rate;
-+ ret = clk_rpm_set_rate_sleep(r, sleep_rate);
-+ if (ret)
-+ goto out;
-+
-+ r->enabled = false;
-+
-+out:
-+ mutex_unlock(&rpm_clk_lock);
-+}
-+
-+static int clk_rpm_set_rate(struct clk_hw *hw,
-+ unsigned long rate, unsigned long parent_rate)
-+{
-+ struct clk_rpm *r = to_clk_rpm(hw);
-+ struct clk_rpm *peer = r->peer;
-+ unsigned long active_rate, sleep_rate;
-+ unsigned long this_rate = 0, this_sleep_rate = 0;
-+ unsigned long peer_rate = 0, peer_sleep_rate = 0;
-+ int ret = 0;
-+
-+ mutex_lock(&rpm_clk_lock);
-+
-+ if (!r->enabled)
-+ goto out;
-+
-+ to_active_sleep(r, rate, &this_rate, &this_sleep_rate);
-+
-+ /* Take peer clock's rate into account only if it's enabled. */
-+ if (peer->enabled)
-+ to_active_sleep(peer, peer->rate,
-+ &peer_rate, &peer_sleep_rate);
-+
-+ active_rate = max(this_rate, peer_rate);
-+ ret = clk_rpm_set_rate_active(r, active_rate);
-+ if (ret)
-+ goto out;
-+
-+ sleep_rate = max(this_sleep_rate, peer_sleep_rate);
-+ ret = clk_rpm_set_rate_sleep(r, sleep_rate);
-+ if (ret)
-+ goto out;
-+
-+ r->rate = rate;
-+
-+out:
-+ mutex_unlock(&rpm_clk_lock);
-+
-+ return ret;
-+}
-+
-+static long clk_rpm_round_rate(struct clk_hw *hw, unsigned long rate,
-+ unsigned long *parent_rate)
-+{
-+ /*
-+ * RPM handles rate rounding and we don't have a way to
-+ * know what the rate will be, so just return whatever
-+ * rate is requested.
-+ */
-+ return rate;
-+}
-+
-+static unsigned long clk_rpm_recalc_rate(struct clk_hw *hw,
-+ unsigned long parent_rate)
-+{
-+ struct clk_rpm *r = to_clk_rpm(hw);
-+
-+ /*
-+ * RPM handles rate rounding and we don't have a way to
-+ * know what the rate will be, so just return whatever
-+ * rate was set.
-+ */
-+ return r->rate;
-+}
-+
-+static const struct clk_ops clk_rpm_ops = {
-+ .prepare = clk_rpm_prepare,
-+ .unprepare = clk_rpm_unprepare,
-+ .set_rate = clk_rpm_set_rate,
-+ .round_rate = clk_rpm_round_rate,
-+ .recalc_rate = clk_rpm_recalc_rate,
-+};
-+
-+static const struct clk_ops clk_rpm_branch_ops = {
-+ .prepare = clk_rpm_prepare,
-+ .unprepare = clk_rpm_unprepare,
-+ .round_rate = clk_rpm_round_rate,
-+ .recalc_rate = clk_rpm_recalc_rate,
-+};
-+
-+/* apq8064 */
-+DEFINE_CLK_RPM(apq8064, afab_clk, afab_a_clk, QCOM_RPM_APPS_FABRIC_CLK);
-+DEFINE_CLK_RPM(apq8064, cfpb_clk, cfpb_a_clk, QCOM_RPM_CFPB_CLK);
-+DEFINE_CLK_RPM(apq8064, daytona_clk, daytona_a_clk, QCOM_RPM_DAYTONA_FABRIC_CLK);
-+DEFINE_CLK_RPM(apq8064, ebi1_clk, ebi1_a_clk, QCOM_RPM_EBI1_CLK);
-+DEFINE_CLK_RPM(apq8064, mmfab_clk, mmfab_a_clk, QCOM_RPM_MM_FABRIC_CLK);
-+DEFINE_CLK_RPM(apq8064, mmfpb_clk, mmfpb_a_clk, QCOM_RPM_MMFPB_CLK);
-+DEFINE_CLK_RPM(apq8064, sfab_clk, sfab_a_clk, QCOM_RPM_SYS_FABRIC_CLK);
-+DEFINE_CLK_RPM(apq8064, sfpb_clk, sfpb_a_clk, QCOM_RPM_SFPB_CLK);
-+DEFINE_CLK_RPM(apq8064, qdss_clk, qdss_a_clk, QCOM_RPM_QDSS_CLK);
-+
-+static struct clk_rpm *apq8064_clks[] = {
-+ [RPM_APPS_FABRIC_CLK] = &apq8064_afab_clk,
-+ [RPM_APPS_FABRIC_A_CLK] = &apq8064_afab_a_clk,
-+ [RPM_CFPB_CLK] = &apq8064_cfpb_clk,
-+ [RPM_CFPB_A_CLK] = &apq8064_cfpb_a_clk,
-+ [RPM_DAYTONA_FABRIC_CLK] = &apq8064_daytona_clk,
-+ [RPM_DAYTONA_FABRIC_A_CLK] = &apq8064_daytona_a_clk,
-+ [RPM_EBI1_CLK] = &apq8064_ebi1_clk,
-+ [RPM_EBI1_A_CLK] = &apq8064_ebi1_a_clk,
-+ [RPM_MM_FABRIC_CLK] = &apq8064_mmfab_clk,
-+ [RPM_MM_FABRIC_A_CLK] = &apq8064_mmfab_a_clk,
-+ [RPM_MMFPB_CLK] = &apq8064_mmfpb_clk,
-+ [RPM_MMFPB_A_CLK] = &apq8064_mmfpb_a_clk,
-+ [RPM_SYS_FABRIC_CLK] = &apq8064_sfab_clk,
-+ [RPM_SYS_FABRIC_A_CLK] = &apq8064_sfab_a_clk,
-+ [RPM_SFPB_CLK] = &apq8064_sfpb_clk,
-+ [RPM_SFPB_A_CLK] = &apq8064_sfpb_a_clk,
-+ [RPM_QDSS_CLK] = &apq8064_qdss_clk,
-+ [RPM_QDSS_A_CLK] = &apq8064_qdss_a_clk,
-+};
-+
-+static const struct rpm_clk_desc rpm_clk_apq8064 = {
-+ .clks = apq8064_clks,
-+ .num_clks = ARRAY_SIZE(apq8064_clks),
-+};
-+
-+static const struct of_device_id rpm_clk_match_table[] = {
-+ { .compatible = "qcom,rpmcc-apq8064", .data = &rpm_clk_apq8064 },
-+ { }
-+};
-+MODULE_DEVICE_TABLE(of, rpm_clk_match_table);
-+
-+static int rpm_clk_probe(struct platform_device *pdev)
-+{
-+ struct clk_hw **hws;
-+ struct rpm_cc *rcc;
-+ struct clk_hw_onecell_data *data;
-+ int ret;
-+ size_t num_clks, i;
-+ struct qcom_rpm *rpm;
-+ struct clk_rpm **rpm_clks;
-+ const struct rpm_clk_desc *desc;
-+
-+ rpm = dev_get_drvdata(pdev->dev.parent);
-+ if (!rpm) {
-+ dev_err(&pdev->dev, "Unable to retrieve handle to RPM\n");
-+ return -ENODEV;
-+ }
-+
-+ desc = of_device_get_match_data(&pdev->dev);
-+ if (!desc)
-+ return -EINVAL;
-+
-+ rpm_clks = desc->clks;
-+ num_clks = desc->num_clks;
-+
-+ rcc = devm_kzalloc(&pdev->dev, sizeof(*rcc) + sizeof(*hws) * num_clks,
-+ GFP_KERNEL);
-+ if (!rcc)
-+ return -ENOMEM;
-+
-+ hws = rcc->hws;
-+ data = &rcc->data;
-+ data->num = num_clks;
-+
-+ for (i = 0; i < num_clks; i++) {
-+ if (!rpm_clks[i])
-+ continue;
-+
-+ rpm_clks[i]->rpm = rpm;
-+
-+ ret = clk_rpm_handoff(rpm_clks[i]);
-+ if (ret)
-+ goto err;
-+ }
-+
-+ for (i = 0; i < num_clks; i++) {
-+ if (!rpm_clks[i]) {
-+ data->hws[i] = ERR_PTR(-ENOENT);
-+ continue;
-+ }
-+
-+ ret = devm_clk_hw_register(&pdev->dev, &rpm_clks[i]->hw);
-+ if (ret)
-+ goto err;
-+ }
-+
-+ ret = of_clk_add_hw_provider(pdev->dev.of_node, of_clk_hw_onecell_get,
-+ data);
-+ if (ret)
-+ goto err;
-+
-+ return 0;
-+err:
-+ dev_err(&pdev->dev, "Error registering RPM Clock driver (%d)\n", ret);
-+ return ret;
-+}
-+
-+static int rpm_clk_remove(struct platform_device *pdev)
-+{
-+ of_clk_del_provider(pdev->dev.of_node);
-+ return 0;
-+}
-+
-+static struct platform_driver rpm_clk_driver = {
-+ .driver = {
-+ .name = "qcom-clk-rpm",
-+ .of_match_table = rpm_clk_match_table,
-+ },
-+ .probe = rpm_clk_probe,
-+ .remove = rpm_clk_remove,
-+};
-+
-+static int __init rpm_clk_init(void)
-+{
-+ return platform_driver_register(&rpm_clk_driver);
-+}
-+core_initcall(rpm_clk_init);
-+
-+static void __exit rpm_clk_exit(void)
-+{
-+ platform_driver_unregister(&rpm_clk_driver);
-+}
-+module_exit(rpm_clk_exit);
-+
-+MODULE_DESCRIPTION("Qualcomm RPM Clock Controller Driver");
-+MODULE_LICENSE("GPL v2");
-+MODULE_ALIAS("platform:qcom-clk-rpm");
---- a/include/dt-bindings/clock/qcom,rpmcc.h
-+++ b/include/dt-bindings/clock/qcom,rpmcc.h
-@@ -14,6 +14,30 @@
- #ifndef _DT_BINDINGS_CLK_MSM_RPMCC_H
- #define _DT_BINDINGS_CLK_MSM_RPMCC_H
-
-+/* apq8064 */
-+#define RPM_PXO_CLK 0
-+#define RPM_PXO_A_CLK 1
-+#define RPM_CXO_CLK 2
-+#define RPM_CXO_A_CLK 3
-+#define RPM_APPS_FABRIC_CLK 4
-+#define RPM_APPS_FABRIC_A_CLK 5
-+#define RPM_CFPB_CLK 6
-+#define RPM_CFPB_A_CLK 7
-+#define RPM_QDSS_CLK 8
-+#define RPM_QDSS_A_CLK 9
-+#define RPM_DAYTONA_FABRIC_CLK 10
-+#define RPM_DAYTONA_FABRIC_A_CLK 11
-+#define RPM_EBI1_CLK 12
-+#define RPM_EBI1_A_CLK 13
-+#define RPM_MM_FABRIC_CLK 14
-+#define RPM_MM_FABRIC_A_CLK 15
-+#define RPM_MMFPB_CLK 16
-+#define RPM_MMFPB_A_CLK 17
-+#define RPM_SYS_FABRIC_CLK 18
-+#define RPM_SYS_FABRIC_A_CLK 19
-+#define RPM_SFPB_CLK 20
-+#define RPM_SFPB_A_CLK 21
-+
- /* msm8916 */
- #define RPM_SMD_XO_CLK_SRC 0
- #define RPM_SMD_XO_A_CLK_SRC 1
projects / openwrt / openwrt.git / blobdiff